This project allows you to control an engine using a Raspberry Pi. I have used this in combination with a L298N module to control a Lego engine. This project was made as a demo for my thesis.
There is a Lego door on a rail that is controlled by a Lego engine. This engine is connected to the L289N module, which is connected to the GPIO header of the Raspberry Pi. The Raspberry is on the same network as a computer which acts as the server.
Upon insertion of a USB device in the Raspberry Pi, the access_listener
script will mount the partition(s) on the device and check if nonce and
nonce.sig are present. These files will be sent to the server to check if
access should be granted. The server will respond and let the Raspberry Pi
know whether it should keep the door shut or turn on the engine thereby
opening the door. The door will automatically close.
The project contains several scripts that can be used to configure, calibrate and test the engine.
Edit default_engine_control.py to give in the GPIO pins that control the
engine.
Run power_state_test.py to test the power states.
Use measure_engine_time.py to detect how long the engine should run in
order to open the door.
Run open_and_close.py to open and close the door. Use the -h flag to show
all available options.
The main script that will actively listen for newly inserted partitions, poll
the server and interact with the user of the access control system is the
access_listener.py. Use the -h flag to show
all available options.