Editing Big Digit Driver Assembly Instructions
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Line 9: | Line 9: | ||
|Type | |Type | ||
|Vendor | |Vendor | ||
− | |Part Number | + | |Vendor Part Number |
− | |Quantity | + | |Quantity per Board |
|---- | |---- | ||
|1 | |1 | ||
|N/A | |N/A | ||
− | | | + | |PCB |
|Big Digit Driver board | |Big Digit Driver board | ||
− | | | + | |EMS |
|N/A | |N/A | ||
|1 | |1 | ||
Line 22: | Line 22: | ||
|2 | |2 | ||
|R25 | |R25 | ||
− | | | + | |Current Sense Resistor for DP |
− | | | + | |22 ohm, substituting 24 ohm 1/4 watt carbon film resistor |
|Digikey | |Digikey | ||
|24QBK-ND | |24QBK-ND | ||
Line 29: | Line 29: | ||
|---- | |---- | ||
|3 | |3 | ||
− | |R1 | + | |R1 through R5 |
− | |68 ohm | + | |DP Load Resistors |
− | + | |68 ohm 1/4 watt carbon film resistors | |
|DigiKey | |DigiKey | ||
|68QBK-ND | |68QBK-ND | ||
Line 38: | Line 38: | ||
|4 | |4 | ||
|R11,R13,R15,R17,R19,R21,R23 | |R11,R13,R15,R17,R19,R21,R23 | ||
− | |16 ohm | + | |Current Sense Resistors |
− | + | |16 ohm 1/4 watt carbon film resistors | |
|Digikey | |Digikey | ||
|16QBK-ND | |16QBK-ND | ||
Line 46: | Line 46: | ||
|5 | |5 | ||
|R12,R14,R16,R18,R20,R22,R24,R26,R27 | |R12,R14,R16,R18,R20,R22,R24,R26,R27 | ||
− | | | + | |Base Resistors, Power LED Resistor |
− | | | + | |1k ohm 1/4 watt carbon film resistors |
|Digikey | |Digikey | ||
|1.0KQBK-ND | |1.0KQBK-ND | ||
Line 54: | Line 54: | ||
|6 | |6 | ||
|D1, D2 | |D1, D2 | ||
− | | | + | |Linear Regulator Load, DP Load (Diodes) |
− | |1N4740A | + | |1N4740A, 10V, 1 watt |
|Digikey | |Digikey | ||
|1N4740A-ND | |1N4740A-ND | ||
Line 62: | Line 62: | ||
|7 | |7 | ||
|U9 | |U9 | ||
− | | | + | |Shift Register Socket |
− | |16 pin | + | |16 pin 0.3" Socket |
|Digikey | |Digikey | ||
|A100206-ND | |A100206-ND | ||
Line 70: | Line 70: | ||
|8 | |8 | ||
|U10 | |U10 | ||
− | | | + | |Schmitt Trigger Socket |
− | |14 pin | + | |14 pin 0.3" Socket |
|Digikey | |Digikey | ||
|3M5462-ND | |3M5462-ND | ||
|1 | |1 | ||
|---- | |---- | ||
− | + | |9 | |
− | |JP1 | + | |JP1 thru JP5 |
− | | | + | |Data Out Schmitt Trigger Bypass |
− | + | |Zero ohm 'Resistors' | |
− | + | |Digikey | |
− | + | |0.0QTR-ND | |
− | | | + | |5 |
− | |||
− | |||
− | |||
|---- | |---- | ||
|10 | |10 | ||
− | |Q1 | + | |Q1 thru Q8 |
− | | | + | |Digital Control Transistors |
− | |2N3904, 40V | + | |2N3904, NPN Transistor, 40V, TO-92 |
|Digikey | |Digikey | ||
|2N3904-APCT-ND | |2N3904-APCT-ND | ||
Line 97: | Line 94: | ||
|11 | |11 | ||
|U1 thru U8 | |U1 thru U8 | ||
− | |Adjustable Linear Regulator | + | |Current Regulators |
− | + | |LM317L, Adjustable Linear Regulator, 0.1A, TO-92 | |
|Digikey | |Digikey | ||
|LM317LZ-ND | |LM317LZ-ND | ||
Line 105: | Line 102: | ||
|12 | |12 | ||
|U11 | |U11 | ||
− | | | + | |Linear Regulator |
− | |TL750L05, | + | |TL750L05, 5V, 150mA, TO-92 |
|Digikey | |Digikey | ||
|296-8002-5-ND | |296-8002-5-ND | ||
Line 113: | Line 110: | ||
|13 | |13 | ||
|C2 | |C2 | ||
− | |Bypass Capacitor | + | |Bypass Capacitor |
− | |Ceramic Capacitor | + | |10uF Ceramic Capacitor |
|Digikey | |Digikey | ||
|445-4816-ND | |445-4816-ND | ||
Line 121: | Line 118: | ||
|14 | |14 | ||
|C1, C3, C4 | |C1, C3, C4 | ||
− | |Bypass Capacitors | + | |Bypass Capacitors |
− | + | |0.1uF Ceramic Capacitor | |
|Digikey | |Digikey | ||
|BC1148TR-ND | |BC1148TR-ND | ||
Line 129: | Line 126: | ||
|15 | |15 | ||
|LED1 | |LED1 | ||
− | | | + | |Power LED |
− | |3mm | + | |3mm Yellow LED |
|Digikey | |Digikey | ||
|754-1212-ND | |754-1212-ND | ||
Line 138: | Line 135: | ||
|J2, J3 | |J2, J3 | ||
|Screw Terminal | |Screw Terminal | ||
− | |2 position euro-style | + | |2 position euro-style screw terminal |
|DigiKey | |DigiKey | ||
|ED2635-ND | |ED2635-ND | ||
Line 145: | Line 142: | ||
|17 | |17 | ||
|J5, J6 | |J5, J6 | ||
− | | | + | |SPI Headers |
− | |0.1" | + | |6 pin (2x3 DIL) 0.1" Header |
|Digikey | |Digikey | ||
|609-3202-ND | |609-3202-ND | ||
Line 153: | Line 150: | ||
|18 | |18 | ||
|J4 | |J4 | ||
− | |Power Jack | + | |Power Jack |
− | |2. | + | |2.1mm ID Barrel Jack |
|Digikey | |Digikey | ||
|CP-002AH-ND | |CP-002AH-ND | ||
Line 161: | Line 158: | ||
|19 | |19 | ||
|U9 | |U9 | ||
− | |Shift Register | + | |Shift Register |
− | |74HCT595, | + | |74HCT595, 8-bit 16DIP |
|Digikey | |Digikey | ||
|568-1560-5-ND | |568-1560-5-ND | ||
Line 169: | Line 166: | ||
|20 | |20 | ||
|U10 | |U10 | ||
− | |Schmitt | + | |Schmitt Trigger |
− | |74ACT14, | + | |74ACT14, 16DIP |
|Digikey | |Digikey | ||
|296-4368-5-ND | |296-4368-5-ND | ||
Line 177: | Line 174: | ||
|21 | |21 | ||
|J1 | |J1 | ||
− | |Display Connector | + | |Display Connector |
− | |11 Position/22 Contact 0.156" pitch | + | |11 Position/22 Contact 0.156" pitch board edge connector |
|Digikey | |Digikey | ||
|EBM11DSAN-ND | |EBM11DSAN-ND | ||
Line 185: | Line 182: | ||
|22 | |22 | ||
|N/A | |N/A | ||
− | |Standoffs | + | |Display Top Standoffs |
− | | | + | |Standoff, 7/8" round |
|Digikey | |Digikey | ||
|1848K-ND | |1848K-ND | ||
Line 193: | Line 190: | ||
|23 | |23 | ||
|N/A | |N/A | ||
− | |Display | + | |Display Bottom Standoffs |
− | | | + | |Standoff, round, 3/4" |
|DigiKey | |DigiKey | ||
|3488K-ND | |3488K-ND | ||
Line 201: | Line 198: | ||
|24 | |24 | ||
|N/A | |N/A | ||
− | | | + | |Display Top Standoff Washers |
− | | | + | |1/16" thick Nylon Washers, #6 screw |
− | |McMaster | + | |McMaster |
|90295A090 | |90295A090 | ||
|2 | |2 | ||
Line 209: | Line 206: | ||
|25 | |25 | ||
|N/A | |N/A | ||
− | |Display/Driver Board | + | |Display Bottom/Driver Board Standoffs |
− | | | + | |1/8" tall Nylon standoff |
− | |McMaster | + | |McMaster |
|94639A407 | |94639A407 | ||
|2 | |2 | ||
Line 217: | Line 214: | ||
|26 | |26 | ||
|N/A | |N/A | ||
− | |Mounting Screws | + | |Display Bottom/Driver Board/Mounting Screws |
− | |Button Socket Cap | + | |Screw, Button Socket Cap 6-32 x 1/2" |
|McMaster | |McMaster | ||
|92949A148 | |92949A148 | ||
− | | | + | |6 |
− | |---- | + | |---- |
|27 | |27 | ||
+ | |N/A | ||
+ | |Display Top | ||
+ | |Screw, Button socket Cap 6-32 x 3/8" | ||
+ | |McMaster | ||
+ | |92949A146 | ||
+ | |2 | ||
+ | |---- | ||
+ | |28 | ||
|N/A | |N/A | ||
|Delrin Insulator | |Delrin Insulator | ||
|Delrin Insulator | |Delrin Insulator | ||
− | | | + | |EMS |
|N/A | |N/A | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
|1 | |1 | ||
|---- | |---- | ||
|} | |} | ||
+ | |||
+ | |||
== Assembly procedure == | == Assembly procedure == | ||
− | + | Looks a bit imposing, huh? Don't worry, looks can be deceiving. We'll show you where each part goes. | |
This guide assumes that you have had some soldering experience. If not, or it's been a while, you may also want to look at pages 2 and 5-7 of the [http://wiki.evilmadscience.com/Bulbdial Bulbdial clock] assembly instructions, which go over basic tools and technique. And, if you really are a beginner, there are plenty of good tutorials on line, like [http://www.instructables.com/id/How-to-solder/ this one]. | This guide assumes that you have had some soldering experience. If not, or it's been a while, you may also want to look at pages 2 and 5-7 of the [http://wiki.evilmadscience.com/Bulbdial Bulbdial clock] assembly instructions, which go over basic tools and technique. And, if you really are a beginner, there are plenty of good tutorials on line, like [http://www.instructables.com/id/How-to-solder/ this one]. | ||
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=== 1. The circuit board === | === 1. The circuit board === | ||
− | Here's what the | + | Here's what the bare circuit board looks like: |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_001.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_001.jpg | ||
− | |||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_002.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_002.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_007.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_007.jpg | ||
− | |||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_008.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_008.jpg | ||
Line 291: | Line 288: | ||
=== 3. Decimal Point Load Resistors === | === 3. Decimal Point Load Resistors === | ||
− | + | Let's finish off the decimal point resistors. | |
+ | |||
+ | We'll be installing 68 ohm resistors (color code: Blue/Gray/Black/Gold) in locations R1 through R5. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_010.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_010.jpg | ||
Line 318: | Line 317: | ||
Getting the hang of this? Great! | Getting the hang of this? Great! | ||
− | Next, let's install the 16 | + | Next, let's install the 16 ohms (color code: Brown/Blue/Black/Gold) current sense resistors. These come as a segment from a large spool. Just pull them straight out and straighten the leads as needed. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_016.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_016.jpg | ||
Line 328: | Line 327: | ||
− | === 5. Base | + | === 5. Base resistors === |
Next, locate all the 1k ohm resistors (color code: Brown/Black/Red/Gold). | Next, locate all the 1k ohm resistors (color code: Brown/Black/Red/Gold). | ||
Line 340: | Line 339: | ||
Last resistor, we promise! | Last resistor, we promise! | ||
− | It's a 1k ohm (Brown/Black/Red/Gold), exactly like the resistors in step | + | It's a 1k ohm (Brown/Black/Red/Gold), exactly like the resistors in step five. This resistor goes in location R27, between the large IC footprint near the top-middle of the board. |
This is what your board should look like now: | This is what your board should look like now: | ||
Line 369: | Line 368: | ||
− | === 8. | + | === 8. Optional: Schmitt Trigger Bypass === |
− | + | Big Digit Drivers can be linked in series via the SPI ports on either side of the board. For long runs of digits (three or more) we've included a footprint for a Schmitt trigger - this IC will 'boost' the signals that run down the series of drivers and helps eliminate synchronization issues due to noise and attenuation. | |
+ | |||
+ | If, for whatever reason, you don't want to use the Schmitt trigger you will need to install four jumpers in locations JP1, JP2, and JP3 (look in the upper right-hand side of the board). | ||
+ | |||
+ | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_025.jpg | ||
+ | |||
+ | For this we'll use zero-ohm 'resistors' - they have no real color code, they look like resistors with a single black stripe instead of five or more. They're not really resistors either (well, they do have a resistance - like all wire - but it is very low!) and each could actually be replaced with a length of wire if you prefer. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_030.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_030.jpg | ||
− | + | They go in like the resistors and diodes in the steps above. | |
+ | |||
+ | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_032.jpg | ||
+ | |||
+ | (Note that in the photo above, jumper JP4 is also installed. Jumper JP4 is covered in step 9 - in this step we're only discussing the three jumpers above it.) | ||
+ | |||
+ | DO NOT use both the Schmitt trigger and bypass jumpers at the same time! Using both shouldn't cause any damage, but the behavior of digits down the line will be strange and unpredictable. | ||
+ | |||
+ | There is no harm is using the Schmitt trigger on short runs of digits, so unless you have a specific reason to not use it we recommend install the Schmitt trigger instead of these jumpers. | ||
− | |||
− | |||
+ | === 9. Optional: SPI header ground connections === | ||
+ | Since Big Digit Drivers can be wired in series essentially indefinitely, we also include the option of isolating the board from the the ground line on the SPI headers. Isolating the ground lines will only be useful to people who are driving a large number of digits on multiple power supplies in specific circumstances, so we recommend that you install these jumpers unless you are completely sure that you need to isolate a Big Digit Driver from the SPI ground line. | ||
− | '' | + | Once again we'll be using zero ohm 'resistors' - just like above in step 8. We'll be installing them in locations JP5 (upper left-hand side of the board, just below the diodes) and JP4 (upper right-hand side of the board, below the Schmitt trigger bypass). |
− | + | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_031.jpg | |
− | + | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_032.jpg | |
− | === | + | |
− | + | === 10. Shift Register and Schmitt Trigger Sockets === | |
+ | We don't recommend soldering chips directly to the board, and the kit include sockets for your convenience. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_024.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_024.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_027.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_027.jpg | ||
− | |||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_028.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_028.jpg | ||
Line 415: | Line 428: | ||
− | === | + | === 11. Digital Control Transistors === |
These transistors are little black cylinders with one side flattened and have three leads coming out one end. They should come attached to a strip of paper tape, but double check their markings just to be sure. They should have the number '2N3904' on the flattened side of the cylinder. | These transistors are little black cylinders with one side flattened and have three leads coming out one end. They should come attached to a strip of paper tape, but double check their markings just to be sure. They should have the number '2N3904' on the flattened side of the cylinder. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_033.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_033.jpg | ||
− | |||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_034.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_034.jpg | ||
− | We will be installing these into locations Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8 (in a line across the middle of the board). Note that orientation matters! Take a | + | We will be installing these into locations Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8 (in a line across the middle of the board). Note that orientation matters! Take a peek at the board. See how the footprint is a circle with a flat side? That flat side matches up with the flat side on the part itself (the side with the text on it) - in other words, the flat side of the part should be facing toward the top of the board. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_035.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_035.jpg | ||
You may have noticed that the transistors also come with pre-bent leads - all you need to do is cut them loose from the paper strip and drop them in place. | You may have noticed that the transistors also come with pre-bent leads - all you need to do is cut them loose from the paper strip and drop them in place. | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
=== 12. Five Volt Linear Regulator === | === 12. Five Volt Linear Regulator === | ||
− | This part will look | + | This part will look similar to the transistors in step 11, except: they will have the number '750L05' on them, do not come attached to paper tape, and do not have their leads pre-bent. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_038.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_038.jpg | ||
Line 453: | Line 454: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_040.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_040.jpg | ||
+ | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_041.jpg | ||
+ | |||
+ | |||
− | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/ | + | === 13. Current Regulators === |
+ | These regulators will look very similar to the 5 Volt Regulator in step 12. Identical, in fact, except that they will have the number 'LM317' on them. | ||
+ | |||
+ | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_036.jpg | ||
+ | |||
+ | Install these in a line just below the transistors, in locations U1, U2, U3, U4, U5, U6, U7, and U8. Once again, orientation matter! Be sure to line up the flat side of the regulator with the flat side of the footprint on the board (the flat side should be facing toward the top of the board). | ||
+ | |||
+ | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_037.jpg | ||
− | === | + | === 14. Linear Regulator Output Capacitor === |
This part will be a little blue blob with two leads coming out of it. | This part will be a little blue blob with two leads coming out of it. | ||
Line 466: | Line 477: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_043.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_043.jpg | ||
− | |||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_044.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_044.jpg | ||
− | === | + | === 15. Other Capacitors === |
These parts will be yellow brown blobs with two wires coming out of them, and come on paper tape (similar to the tape the transistors came in). | These parts will be yellow brown blobs with two wires coming out of them, and come on paper tape (similar to the tape the transistors came in). | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_046.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_046.jpg | ||
− | |||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_047.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_047.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_049.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_049.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_048.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_048.jpg | ||
− | === | + | === 16. Power Indicator Lamp === |
The Big Digit Driver board has a power light. Nothing fancy, just a yellow LED. It goes in location LED1 - between the two IC footprint in the upper middle of the board. | The Big Digit Driver board has a power light. Nothing fancy, just a yellow LED. It goes in location LED1 - between the two IC footprint in the upper middle of the board. | ||
Line 491: | Line 499: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_050.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_050.jpg | ||
− | |||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_051.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_051.jpg | ||
− | === | + | === 17. Screw Terminal Power Connectors === |
These are the green plastic blocks with screws in the top of them. You can install them in any orientation, but it's probably better to install them with the wire slots facing outwards. | These are the green plastic blocks with screws in the top of them. You can install them in any orientation, but it's probably better to install them with the wire slots facing outwards. | ||
Line 504: | Line 511: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_055.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_055.jpg | ||
− | |||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_054.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_054.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_057.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_057.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_056.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_056.jpg | ||
− | === | + | === 18. SPI headers === |
These are also a bit tricky. The SPI header is a two by three block of straight pins. These should drop right into locations J5 and J6, on the left-hand and right-hand side of the board. Solder one pin on the back and then flip the board over. Make sure that the header is perpendicular to the board and the black plastic block is seated on the board. Once you're sure the header is seated properly, solder the rest of the pins on the back. | These are also a bit tricky. The SPI header is a two by three block of straight pins. These should drop right into locations J5 and J6, on the left-hand and right-hand side of the board. Solder one pin on the back and then flip the board over. Make sure that the header is perpendicular to the board and the black plastic block is seated on the board. Once you're sure the header is seated properly, solder the rest of the pins on the back. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_060.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_060.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_059.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_059.jpg | ||
− | === | + | === 19. DC Power Barrel Jack === |
This part goes in location J4, on the right-hand side of the board. | This part goes in location J4, on the right-hand side of the board. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_062.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_062.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_061.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_061.jpg | ||
Line 538: | Line 541: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_063.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_063.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_064.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_064.jpg | ||
Line 545: | Line 547: | ||
− | === | + | === 20. Insert Shift Register === |
The shift register is a 16 pin IC that has '74HCT595N' on it. It is the top chip in this photo: | The shift register is a 16 pin IC that has '74HCT595N' on it. It is the top chip in this photo: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_066.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_066.jpg | ||
− | You may need to | + | You may need to fiddle with the pins a bit to get it to plug into the socket at U9. Carefully pressing the side of the pins against a flat, hard surface is a good way to do this. |
− | + | Orientation matters with this part! See that notch on one end of the IC (on the left end in the photo)? That should line up with the notch/semi-circle on the IC footprint on the board. | |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_067.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_067.jpg | ||
Line 558: | Line 560: | ||
− | === | + | === 21. Optional: Insert Schmitt Trigger === |
− | The Schmitt | + | If you didn't install the Schmitt trigger bypass jumpers in step 8 you should install the Schmitt trigger at this point. |
+ | |||
+ | The Schmitt trigger is the 14 pin IC that has 'SN74ACT14N' written on it. It is the bottom chip in this photo. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_066.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_066.jpg | ||
− | + | The Schmitt trigger and it goes in location U10. Like the shift register, orientation matters: the notch on one end of the IC (on the left end in the photo above) should line up with the notch/semi-circle on the IC footprint on the board. | |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_068.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_068.jpg | ||
+ | Note: The behavior of a Big Digit Driver board with both a Schmitt trigger and Schmitt trigger bypass installed is undefined! Do not have both installed at the same time. Nothing will be damaged but you'll see some really weird results. | ||
− | === | + | === 22. Display connector === |
Almost done! | Almost done! | ||
Line 575: | Line 580: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_069.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_069.jpg | ||
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http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_070.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_070.jpg | ||
Line 587: | Line 591: | ||
− | + | === 23. You're done with the electrical stuff! === | |
− | === | ||
Good work, the board is finished. Now lets get it attached to a display, eh? | Good work, the board is finished. Now lets get it attached to a display, eh? | ||
− | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/ | + | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_079.jpg |
We'll be installing an insulator to prevent the Big Digit Driver board from coming on contact with the display and causing a short circuit. We'll also be attaching metal standoffs to the back of the display for mounting purposes. | We'll be installing an insulator to prevent the Big Digit Driver board from coming on contact with the display and causing a short circuit. We'll also be attaching metal standoffs to the back of the display for mounting purposes. | ||
− | === | + | === 24. Attach The Display === |
The driver board slides onto the back of the display. Plugging the display into the edge connector should do a pretty good job lining up the mounting holes. | The driver board slides onto the back of the display. Plugging the display into the edge connector should do a pretty good job lining up the mounting holes. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_080.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_080.jpg | ||
− | + | === 25. Delrin Insulator === | |
− | |||
− | === | ||
The plastic insulator goes between the driver board and display. Note that the insulator has two holes - these line up with the middle pair of holes on the driver board (specifically, the holes that are slightly farther from the edges than the other four and line up with the mounting holes in the display). | The plastic insulator goes between the driver board and display. Note that the insulator has two holes - these line up with the middle pair of holes on the driver board (specifically, the holes that are slightly farther from the edges than the other four and line up with the mounting holes in the display). | ||
Line 611: | Line 612: | ||
− | + | === 26. Board Spacers And Standoffs - Bottom of Display === | |
− | === | + | To secure the driver board to the display we use a 1/8 inch (3.2mm) thick nylon washer, 1/2 inch (12.7mm) long 6-32 screw, and a 3/4 inch (19mm) tall threaded standoff. The washer goes between the display and the driver board, either on top of or under the Delrin insulator (your choice). On the bottom corners, pass a screw through the display board, insulator, washer, and driver board. Screw a standoff onto it. |
− | To secure the driver board to the display we use a 1/8 inch (3.2mm) thick nylon washer, 1/2 inch (12.7mm) long 6-32 screw, and a 3/4 inch (19mm) tall threaded standoff. | ||
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+ | === 27. Board Spacers And Standoffs - Top of Display === | ||
+ | To match the height of the stack-up on the bottom of the display, use the 1/16 inch (1.6mm) thick nylon washer, 7/8 inch (22.2mm) tall threaded standoff, and 3/8 inch (9.5mm) long 6-32 threaded screw. On the top corners, pass a screw through the display board and washer. Screw a standoff onto it. | ||
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− | + | === 28. Really done this time! === | |
+ | That's it, you're completely done! Hang it on a wall and plug it in! The kit includes four extra 1/2 inch 6-32 screws for mounting purposes. | ||
+ | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_082.jpg | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_083.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_083.jpg |