Difference between revisions of "ISP Shield 2 Assembly Instructions"

Revision as of 05:19, 1 June 2011

This page walks through the basic assembly process for building the ISP Shield 2.0.

Bill of Materials, or, "What's in the kit?"

Assembly procedure

We'll go line by line through the kit components. 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 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 this one.

(Assembly instructions will be posted by June 1, 2011. Not yet!)

0. The circuit board

Here's what the bare circuit board looks like:

We'll be adding components to the various locations labeled on the board.

1. Install the 10k resistor and 100 ohm resistor

There are three types of resistor in the kit:

• The 10k "pull-up" resistor is the one resistor that is physically smaller than the others. It has a color code of brown-black-orange-gold.
• There is also only one 100 ohm resistor. That's the "middle" one in the picture above. It has a color code of brown-black-brown-gold.
• There are five 1k resistors. Their color code is brown-black-red-gold. Rather than reading the color codes, just note that these are the five identical resistors. In the kit, these may be taped or bagged to separate them from the other resistors.

Install the 10k "pull-up" resistor (again, the smaller one) in location R1. Solder both pins, and clip the excess leads short on the back side. (Orientation: either way; resistors are not directional.) Then, install the 100 ohm resistor at location R7. Again, solder both pins and clip the excess leads short.

When you've finished adding these two resistors, your board should look like this:

2. Install the 1k resistors

Next, install the 1k resistors. There are five of these resistors, that go in locations R2, R3, R4, R5, R6-- the other places where resistors are visible in the photo above-- and are installed with the same technique as the last resistors.

The color code on these is Black-Brown-Red-Gold, but more importantly, these are the remaining five identical resistors.

3. The six pin right angle header

This six-pin header is installed across locations J5 and J6. The short, angled end of the connector drops into the row of holes at location as shown:

The pins are thick and do not bend easily. So, there is a trick that you can use to prevent the header from falling out of the board when you turn it over to solder it in place, and to make sure that it ends up squarely in place.

First, carefully solder just one pin to the board as shown above. (We suggest the one with the square pad.) Then, make sure the long pins on the header are parallel with the board and that the header is fully seated on the board: the black plastic block should be flush to the board. If this is not the case, carefully reheat the soldered joint and adjust the header as needed. Be careful-- it will be hot!

Once the header is lined up flip the board over and solder all the other five pins to the board. (You can solder all six from the bottom, but remember to start with one of the holes that isn't the square-pad one!) The header pins on the back side are short enough that they do not need to be trimmed.

Your board should look like this now:

4. The LEDs

There are four identical LEDs included with the kit, that go in the locations labeled PROG, ERROR, PULSE, and HELLO.

Orientation is important: the long lead goes into the square hole.

Solder them in place and clip the leads short. After inserting the LEDs but before soldering, you can bend the leads out at 45 degrees to hold an LED in place while you solder.

If everything is correct, the flat faces of each LED will appear as shown above.

Your board should look like this:

5. The Crystal and Capacitors

This quartz crystal is contained in a shiny metal can-- shaped like a stainless-steel twinkie rejected by a robot smurf -- with two prongs. The two prongs go in the outer two holes (not the middle hole) of location XTL on the circuit board. It is not directional; it can go in either way. As before, solder it in place and clip the leads.

6. 18 pF ceramic capacitors

These are two tiny yellow devices, marked with a black stripe to label them. The go in locations C2 and C3, on either side of the crystal. They are not directional; they can go in either way. Solder both in place and trim their leads.

7. 0.1 uF ceramic capacitor

There is only one, and it goes in location C1. It looks just like the 18 pF capacitor, but without the black stripe. It is not directional; it can go in either way. Solder it in place and clip the leads.

8. Reset switch

There is only one, and it goes in location RESET. It snaps into the board-- make sure that it sits flush. It is not directional; it can go in either way. Solder it in place. The leads are short and do not need trimming.

Having added the capacitor in the last step and now the switch, your board should look like this:

9. The 6-pin ISP Header

The ISP header is a two by three block of straight pins. It should drop right into location ISP6.

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.

10. The 'Stackable' Headers

The ISP Shield is intended to be used as a 'shield' with an Arduino or Arduino-compatible board, and so it comes with the appropriate 'stacking' headers.

The six pin headers go in locations J2 and J4, while the eight pin headers go in locations J1 and J3.

To add these, we recommend inserting all four headers and then resting the board-- upside down --on the four headers, so that they sit flush to the board. Solder one end pin of each first. Flip the board back over and check that the pins are perpendicular to the board. Make sure the headers aren't 'twisted' in their sockets - make sure the edges of the socket are parallel with the silkscreen outline on the board.

If any header/socket isn't aligned correctly, heat up the solder on the single soldered pin and adjust the header/socket as needed.

Once everything is aligned, flip the board back over and solder the rest of the pins. Try to use a minimal amount of solder, so that solder does not wick down onto the pins, as that could potentially cause difficulty inserting the shield into an otherwise receptive Arduino board.

11. The ZIF Socket

This socket goes in location U1 on the circuit board. Orientation is very important: The side with the lever sits above the end of the chip with the "half moon" indentation on the circuit board drawing. In other words, the lever is on the side closer to where it says "ISP Shield."

Press the socket flush to the board. If you lower the lever, you can rest the board upside down on the ZIF socket while you solder the pins in place. The leads on the back side are short enough that they do not need to be trimmed.

12. Add Function Jumpers

Push the jumpers onto the six pin header at location J5 and J6.

13. You're Done!

Next, go take a look at the usage instructions.