HW PWM stops working after running main program

[Willmish]

After running main.py, the HW PWM no longer works (even after stopping the program), when testing with development_testing/lighting_sys.py test. However if its run right after booting up (the test), it works fine.

To reproduce:

• [ ] turn on rpi
• [ ] make sure pwm is enabled in /boot/config.txt (see: https://github.com/Pioreactor/rpi_hardware_pwm)
• [ ] turn on the test program
• [ ] pwm should work fine (Mosfet LED turns on)
• [ ] turn on the main.py program
• [ ] Mosfet no longer works (LED light off)
• [ ] turn on the test program, mosfet still doesnt work

To find the issue:

• [ ] Break down main.py, disabling system 1 by 1 until the offending part is found -> fix it then
• [ ] Most likely it is the GPIO PWM interfering with the HW pwm somehow, or some grove sensor stuff messing it up