..................FAQ..................
Q1: Why some channels of the four-channel/eight-channel relay module do not work?
A1: The relay module is triggered by a low-level voltage. The relay module requires nearly 70ma current per channel. This problem will occur if the power supply is insufficient. Please use a 5V/1A or higher power supply to power the relay module.
Q2: Is the relay module a high-level trigger or a low-level trigger? What is the working voltage? What is the operating current?
A2: This module is low-level triggered, and the current on the IO pin is less than 2ma when low-level triggered. The module is compatible with 3.3V TTL level, but the power supply voltage must be 5V, and the operating current of one relay is 70ma.
Q3: Cannot insert the relay into the breadboard?
A3: You have to bend the middle pin of the relay slightly to the right before you can insert it into the breadboard.