There's a lot going on with this compact breakout, and many ways to do one thing so reviewing the pinouts is a really good idea!
- VDD - this is the power input pin for the TPL5111 chip. Make sure this matches the logic level for the device you want to control. Make sure this is always connected and powered. This has to be 3-5VDC so don't give it 12VDC power!
- GND - this is shared ground for power and signal.
Delay - this is the delay control pin. By adjusting the resistance (not voltage!) connected to this pin through to ground, you can change the delay between powerings. By default this is connected to the onboard trim potentiometer. However, you can cut the trace on the back and then connect your own resistor between Delay and GND. Also, if this pin is connected directly to ground (say through a switch) it will activate the output instantly.
Note this pin is not continuously sampled. You need to remove and re-apply power once you change the resistance!
- ENout - this is the Enable output pin, the TPL5111 will set this pin high with the same voltage as from VDD when the timer activates
- Done - This is the signal pin from the driven electronics back to the TPL5111 to let it know that it is 'done' with whatever it had to do, and the TPL5111 can turn it off by setting the ENout pin low
There is also an 'active' LED in the top right. This will let you know when the ENout pin is powered. It does draw some current so if you need ultra-low current draw, cut the trace behind the PCB!