Simple stresser

Sweeps a stepper motor between two limit switches with variable speed and a gentle ramp.

Connections are as follows:

• A0: Wiper of a pot between Vcc and GND. Controls speed (mapping is set via #defines).
• 11: Stepper driver pulse input.
• 12: Stepper driver direction input.
• 13: Stepper driver enable input (low is enabled).
• 8: Limit switch, normal closed.
• 9: Limit switch output. Wired to a led, when we detect a limit hit it's active.

Compiling

We are using PlatformIO but it works fine under the Arduino IDE too.