Hi, i tried to use a 8 relay board and i experience some power problem. If someone can help me to understand my error, it will be great.
This case describe perfectly my connection :
dlloyd: The first thing to do is ensure you have your relay module connected properly and adequately powered. This example shows how to make use of the optic isolation feature.
- Remove blue jumper
- Connect JD-VCC and GND from the Relay Module to a Separate 5VDC Supply (1Amp or greater)
- Connect VCC from the Relay Module to 5V on your Arduino
- Connect required control signals as shown
- Note: DO NOT connect GND from the Relay Module to your Arduino
It works perfectly if i activate only 1 to 4 relay simultaneously. And it use near to 250 mA on the dedicate 5VDC. But if i activate a new relay, it works but after some second, power consumption start to decrise and all relay start to be unstable (LOW / HIGH very quickly). More relay i activate simultaneouly more quickly the power unstability arrive.
I have tried with two differents mega. And i have try a L7805C and a LM1117 for the dedicate 5VDC with same result.