binyameen panali wrote:i am new to raspberry pi. i have a requirement that need to connect 20 analog input to raspberry pi3. how can approach to it. sir please give me a solution
mahjongg wrote:actually its more like 15mA per pin 50mA total for all GPIO's, but yes that won't drive relays directly, you need to use it to turn on a transistor, and don't forget the diode over the coil of the relay.