- RPi,enclosure etc. Digikey BOM
- UnlockOslo RPi hat. Digikey BOM
- wiring
- Ethernet cable
3d-model. FreeCAD source
The "alpha" board is a Hat for Raspberry Pi boards. Main features:
- Step down converter to 5 V, 2 A. This is enough to power the Raspberry Pi board.
- 8 inputs, supports up to 24 V inputs.
- 6 outputs, the output voltage is the same as input voltage. LEDs indicate the pin's status.
- On-board temperature sensor.
- Two status LEDs, controlled by GPIO.
- The serial port is broken out on its own header. Useful for low-level rpi debugging.
- 5 V and 3 V rails are broken out to a separate power header. The 3 V rail is from the rpi regulator.
Improved version of alpha-1. Fixed bugs, added reverse polarity protection. Produced by PCBway, assembled at Bitraf.
An experiment into if it was possible to include an esp8266 on the board while keeping it RPi hat compatible. Conclusion: Almost possible.
Original version. Deployed at two locations.
All components available from Digikey.
The PCB has been successfully produced by PCBWay, and assembled at Bitraf.
A testing script exists for checking the inputs, outputs and status LEDs. This is intended to run on the Rasperry PI setup in the normal way (see firmware for setup).
First stop the firmware service temporarily
sudo systemctl stop dlock-firmware
Move to firmware dir and change user
sudo su dlock
cd /opt/dlock/src
Check the inputs
./venv/bin/python3 firmware/check_hardware.py input
Check the output
./venv/bin/python3 firmware/check_hardware.py output
Check the status
./venv/bin/python3 firmware/check_hardware.py status
