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Step 3Soldering wires
Solder on the wires: I used white for "+", black for "-", purple for "calibrate," and so on.
Pass the wires through the holes until the sensor is flush.
Since the solder connections are fragile, apply some epoxy and fill in the holes (you don't want to resolder through acrylic if any break). Glue down the LEDs as well.
This is also a good time to glue down the battery holder... use one of the doughnuts as a guide. Make sure you'll have clearance for replacing the battery.
For multi-drop connections like ground, I prefer to expose a long arc of wire and connect with smaller pieces as needed.
Hook up all the "-" of the LEDs to the negative terminal of the battery holder.
Pass the wires through the holes until the sensor is flush.
Since the solder connections are fragile, apply some epoxy and fill in the holes (you don't want to resolder through acrylic if any break). Glue down the LEDs as well.
This is also a good time to glue down the battery holder... use one of the doughnuts as a guide. Make sure you'll have clearance for replacing the battery.
For multi-drop connections like ground, I prefer to expose a long arc of wire and connect with smaller pieces as needed.
Hook up all the "-" of the LEDs to the negative terminal of the battery holder.
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