Here’s the details for what we did for the Avant hand sanitizer.
We soldered a pair of wires to the motors. To do that we unscrewed the middle section of the box and soldered the wires onto pin headers that we soldered to the green PCB. We routed routed the wires through holes drilled through the separating platform between the lower case and the area holding the soap.
We separated the batteries from the mote and mounted both on the lower front of the inside of the box, facing the user — batteries on one side, mote on the other. We had to drill some holes to make a path for the wire.
These 4 wires — two from the motor and two from the batteries were routed to the circuit boards we made. The batteries go to a 2-prong connector (connector set MTA socket with wires and header .1 spacing, 2 pin), which we got from the electronics shop. The wires from the motor got to a three-prong connector (also connector set MTA socket with wires and header .1 spacing, 3 pin), also from the electronics shop, but we cut one of the wires off, so that one connector would be 2-pin, one 3-pin and they wouldn’t be accidentally plugged into the wrong place. We actually routed one set of wires from the solder points close to the boards, then soldered the wires to the appropriate trimmed wires coming from the connectors.
The eagle file for the circuit board is in the project file on the lab server. The parts that go on the circuit board are:
1. Female MTA socket with wires and header .1 spacing, 2 pin
2. Female MTA socket with wires and header .1 spacing, 3 pin
3. Optocoupler Isolator Phototransistor 50 MA CTGR-20% DIP-6.
4. 330 ohm resistor
5. A 2×5 male pin set with .1″ spacing
6. A 2×3 male pin set with .1″ spacing
The board was made in the electronics shop. The pin sets were designed to plug into matching female pin sets soldered directly onto the mote.