I am new to Arduino. The digital pins can be configured as output (https://www.arduino.cc/en/Tutorial/DigitalPins) for triggering some sensors. I am now setting a digital (output pin), say no. 7,which is connected to the
in1 pin of a SRD relay (https://blog.siliconstraits.vn/relay-what-is-it-and-how-to-use-it/):
I am not very clear about the direction of current flowing in the wire connecting the arduino digital pin to
in1. To my understanding, when
digitalWrite(pin, HIGH), no current flow into the arduino pin, the relay is not triggered, while
digitalWrite(pin, LOW), the current flow into the arduino, and the relay is triggered. Please correct me if I am wrong. Thanks.