Raspberry pi 3 with Grove Pi+ using ultrasonic sensor and relay. I have the raspian installed and software is installed to make the grovepi+ work. I have tested following few examples.
This is the relay I am using;
My code is very simple. I am reading the values from the ultrasonic sensor and at the specific distance triggering the relay ON or OFF.
Basically, just combined these two examples;
I am using an external adapter that is providing 5V, 2A to RPi.
The idea is that I will use ultrasonic sensor to check how much water is left in the tank and then based on that information will turn ON or OFF the water pump. I have a small pump for aquariam that takes AC 230 input and rated 8 W.
Here is the issue now;
Whenever I test my program without connecting the pump to the realy everything works fine. Btw I have tested couple of relays.
When I connect the pump with the relay, what happend is when the realy turns ON the pump starts and I can see distance on the Pi screen which I am printing. BUT when I turn OFF the relay my Pi screen goes dark for a second and comes back, the program freezes and the RST LED turn ON on the GrovePi shield. I then have to restart my Pi to make the program work again.
Any help in this direction will be really appreciated.
Robert, I have initially thought the same thing. But then the problem is lets assume that is the case and if I take say a lamp and i will not have this problem. This will still not solve my problem because I will be driving an AC motor/pump with this realy anyways as that is the main part of project.
But I am going to try with a lamp anyways.
I have tried a normal table lamp that also takes AC as input. The behaviour is somewhat inconsistent. Usually it is working but sometimes it hangs and the RST LED goes red. I then reset and try again and often it works. Whenever it hangs the screen remains the same unlike the case when I was using the pump.
Seems like the pump is drawing too much current (impulse) that is the problem?