A small board built to measure current and voltage of an appliance.
This board was used as a testbed for STM32 ADC oversampler, UART and DMA.
To measure current and voltage values, a 12-bit ADC was used, with an oversampling ratio of 256x and an 8-bit shift to obtain efficient data averaging - this provides stable readings, along with a sampling time of 3.5 cycles for current and 79.5 cycles for voltage. DMA was also used to transfer all the ADC readings into memory without performance losses.