Troubleshooting

- Is your power source plugged in?

- Did you choose the right board and serial port in the "Tools" menu?

- Go back through your wiring.

- Confirm that your wiring pins match your pin assignments in your programming.

- Print values to the serial port to see what a sensor is reading or where your code is going after a certain step.

- Use the logic probe to see if your I/O pins are reading the correct values at the correct times.

- Use a multimeter to check for proper voltages, resistances, and currents.