I have generated a variable frequency and pwm rectangular wave signal using Arduino Uno, it is pretty much the same using Nano. I have a Nano with me right now. I can deliver in two days.
Relevant Skills and Experience
Arduino, timers, interrupts, C Programming, C++ programming
Proposed Milestones
$300 USD - variable freqency and pwm signal
When do we start working? I have a lot of free time this week.