I am using raspberry pi zero W for a home automation project. I am using 5V 16 channel relay board and using all the 16 relays as part of the project. I have not connected a separate 5V power supply to the relay board and using 5V pin of pi instead. The relays are working perfectly fine(switching on and off with no issues). I have connected a 5V 2A power supply to pi. I have the following doubts, please clarify with in-depth explanation if possible:
- Is it OK to avoid separate 5V supply to relay board and use the pi's 5V pin ?
- I have a use case where sometimes all the relays needs to be switched on at the same time. will that have any bad consequence on the pi ?
- I am able to switch on 10 or sometimes 11 relays only. When trying to switch on more relays, the led of the relay glows but there is no tick sound and the relay is not passing the electricity through it. Can someone please help me understand what's happening and please suggest a better way of connecting the 5V 16 channel relay board to pi zero W so that the pi doesn't get damaged.
- Does supplying 5V 3A power to the pi solves the problem stated in question 3 ?
The connections are as shown below: