Editing Big Digit Driver Assembly Instructions
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− | === 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). | ||
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− | === 8. SPI Header Ground | + | === 8. SPI Header Ground Connections === |
− | Next, we will install the jumpers that connect the Big Digit Driver to the SPI ground line. For this we'll use zero ohm wire jumpers, which look like resistors with a single black stripe instead of four or more. (If you should need additional jumpers beyond those included with the kit, you can use plain wire as a substitute.) | + | Next, we will install the jumpers that connect the Big Digit Driver to the SPI ground line. For this we'll use zero-ohm wire jumpers, which look like resistors with a single black stripe instead of four or more. (If you should need additional jumpers beyond those included with the kit, you can use plain wire as a substitute.) |
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 | ||
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''Please note that locations JP1, JP2, and JP3 are normally left unpopulated.'' | ''Please note that locations JP1, JP2, and JP3 are normally left unpopulated.'' | ||
− | (Aside: Jumpers at JP1-JP3 can be used to bypass the Schmitt-input "buffer" chip. Even though some of our photos do show these installed, please leave JP1-JP3 empty ''unless you really know what you're doing''. If for a good reason you do install jumpers in JP1-JP3, you ''must not'' install the | + | (Aside: Jumpers at JP1-JP3 can be used to bypass the Schmitt-input "buffer" chip. Even though some of our photos do show these installed, please leave JP1-JP3 empty ''unless you really know what you're doing''. If for a good reason you do install jumpers in JP1-JP3, you ''must not'' install the IC in location U10, and instead leave that socket empty.) |
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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 | ||
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− | === 17. SPI | + | === 17. 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. | ||
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=== 26. Board Spacers And Standoffs - Top of Display === | === 26. 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 | + | 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. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_088.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_088.jpg |