Hi, i using arduino to control water pump. When display is connected it freezes sometimes. I have 2 different lcd displays and with old one it works longer without freezing, but with new one it freezes very often. I measured resistance and there is difference between these 2 lcd's even they looks same, except few details on i2c serial adapter.
I noticed that when arduino is on and if i disconnect and connect new display it restarts arduino, and old one doesn't do that, so i soldered few resistors between vcc and all other pins on i2c serial adapter and after that it worked longer without freezing and didn't restart arduino.
But, it still freezing more often than old one. I connected old one and left it overnight and it freezed once. Without display it works without freezing.
I have no more ideas, maybe i should put resistor on sensor pins, but how to connect it?