MORLOCK mk3

By Curt

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morlock

Pin Description
1 +3.3v directly from the regulator. You may source up to 500ma from this pin but be warned, it does not sleep so will drain the battery if left drawin power. It's main job is to activate the trigger switch (pin 2)
2 Trigger input, this goes directly to PAO2 on the SAMD21. It can be used as a Vout (DAC) to drive a speaker or whatever, but the primary purpose is to wire a switch to pin 1 as the trigger input (active high)
3 Ground. pretty much tells the story, the main purpose here is to be the other half of an external power input, the positive coming on pin 4
4 Input from an external battery, this pin is diode-protected, and allows input up to 18v (a pair of 9v batteries would be fine, but should be unnecessary with the voltage booster able to provide up to 20v)
5 Output from the voltage booster meant to drive solenoid 1 (this pin is internally connected to pin 7)
6 Solenoid 1 switched input. Wire solenoid 1 between 5 and 6. This pin is diode-protected from flyback so safe to use with coils
7 Output from the voltage booster meant to drive solenoid 2 (this pin is internally connected to pin 5)
8 Solenoid 2 switched input. Wire solenoid 1 between 7 and 8. This pin is diode-protected from flyback so safe to use with coils
9 Eye emitter negative. Internally current-limited with a 420ohm resistor
10 Eye emitter positive. This pin is directly connected to pin PA30 (SWCLK) on the SAMD21 and can be used for general I/O, in this case it is an output, allowing the eye to be powered up or down to conserve power in sleep.
11 Eye Detector positive. This pin is directly connected to pin PA31 (SWDIO) on the SAMD21 and can be used for general I/O, in this case it is an output, allowing the detector to be powered up or down to conserve power.
12 Eye Detector negative. This is meant to work with a Phototransistor (NOT a photo-diode) and has an internal pull-down of 4.7k ohms.