The ARM-based (SAMD21) Arduino Nano 33 IoT might have been rushed into production based on a somewhat deficient assignment of Timer/Counters to PWM pin functions. Arduino documentation claims 11 PWM pins: D2, D3, D5, D6, D9, D10, D11, D12, A2, A3, and A5. However the following is not documented: This means there are only really …