Dual Servo Controller Assembly Instructions

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Before you begin soldering, spread out the parts you've received and make sure you have everything. You should have all the following components:

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For detailed information about each component check out the Dual Servo Controller Bill of Materials.


Now that you have everything lets begin. First, insert the the resistor into the PCB. Resistors are non-polar so they can be inserted in any orientation. To make to easier to insert the resistor, bend it into a staple shape, like this:

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Once the resistor is inserted, bend out its leads so that it stays in place.

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Next insert the diode. The diode needs to be inserted in the correct orientation. Make sure that, once inserted, the stripe on the diode matches up with the stripe on the PCB graphic.

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Once you insert the diode, bend out its leads so that it stays in place.

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Insert the capacitor. This capacitor is non-polar and can be inserted in any orientation.

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And bend out its leads to keep it in place.

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Flip over the PCB and solder the components that you've inserted so far.

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Snip the leads off using your flush cutters. Cut at the base of each lead, you want there to be nothing sticking out of the solder joint. The lead will fling once you snip it so hold it with your other hand while cutting.

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Next insert the push button. The button's pins form a rectangle and both of the orientations that the button fits into the PCB is correct. The button snaps in place when you insert it so it wont fall out when you solder it.

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Flip over the PCB and solder the button.

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Now insert the top 2x3 header.

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Solder the top 2x3 header in place. This is a little tricky. Hold the header in place with your finger so that it doesn't fall out and solder one of the corner pins. You should rest your finger on 4 of the 6 pins so that your finger does not touch the corner pin that you are soldering. To solder this pin one handed apply a small glob of solder to the soldering iron, then, using your iron, try to get some of the solder to stick to the pin. You don't need to do a perfect soldering job, you just need enough solder on there to keep the header from falling out.

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With the header held in place, you can now use both your hands to solder the remaining pins. Be sure to return the pin you soldered one handed and resolder it to create a good solder joint.

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Insert the 1x3 header.

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Flip over the PCB and solder the 1x3 header in place. Use the same technique as you used to solder the 2x3 header, holding the header in place with your finger to solder the first pin. Then use two hands to solder all of the pins.

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Next insert the bottom 2x3 header. This is optional. This header is used only to reprogram the Attiny85 microcontroller. The Attiny85 with this kit already comes programmed, so if you are planning on never loading custom firmware on to the chip you can leave this header off.

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But if you do decided to include the header, solder it in place using the technique you used to solder the previous two headers.

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Now it's time to insert the Attiny85 microcontroller. The pins of the microcontroller come flared out. To make it easier to insert the chip you should bend the legs inward a bit. An easy way to do this is against a hard surface, like this:

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Now insert the Attiny85. Orientate it so that the dot on the Attiny85 is on the same side as the notch drawn on the PCB graphic.

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Flip over the PCB, pick at least two legs of the Attiny that are in opposite corners and bend them down toward the PCB. This will keep the Attiny in place while you solder it.

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Solder the Attiny85 in place.

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Insert the two potentiometers into the PCB. It doesn't matter which one goes where, both of them are the same. The potentiometers snap into the PCB and will hold in place while you solder them.

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Flip over the PCB and solder the two potentionmeters in place. The large circles require a lot of solder to fill. Having a good soldering iron here will help.

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And you're finished! High-fives all around.

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