switching to TTL pin from TTL- pin on controller #4
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When the fob box is unplugged while the laser is on, the laser starts firing. Even when the door is open.
This is because the T9+ controller's TTL- (inverting) pin is being pulled to ground through the other electronics on the box.
The T9+ has a TTL pin (non-inverting) pin which is not connected directly to the laser power supply. We sense the laser being on from there, which is active HIGH.