![]() ![]() Again, you don't share enough to comment, but I'd start without it.Ģ) The relay wiring may or may not be correct. You don't tell us anything about the PCB that the pushbutton is mounted to, so this ground connection may be required for the rest of your system to work or it may cause undesirable ground loops. (Maybe 1uf).ġ) The connection between the relay/pushbutton and Arduino ground isn't necessary to make the circuit work at you describe. If immediate switching time is not critical adding a small cap on the transistor base to ground can prevent fast multiple ON-OFF cycles that could reduce the life of the bulb. Lower resistor values reduce the chance of unknowingly activating the transistor, but at some point the high signal will not be able to turn it on. With a 5v Uno a matching 10k should be OK. Adding a resistor to ground, (before or after the existing 10k) will help prevent an open port or a light pull up from activating the transistor. ![]() To insure stable operation be sure to set the controlling port pin quickly to a digital output and set the initial logic value. In this case you might be unknowingly turning the transistor on intermittently with noise or pull up leakage current. In those cases the port may be set to a high impedance input with or with out a light pull up resistance. ![]() However the Uno ports are not programmed at reset or when there is no program running. One issue is that you do not have a fixed grounding resistor on the transistor. Why am I getting the noise of clicking continuously when I use Arduino instead of the power supply? If I connect the bulb to it, it may damage my bulb (I'm assuming this since the relay seems to be switching fast and continuously) I am getting a continuous clicking sound from the relay. Using a regulated power supply (a desktop PC's SMPS unit with 12v, 5v, and 3.3v outputs), when 5V is applied to the pin of microcontroller, I get a click sound from the relay and the bulb is switched ON and when the pin is kept open, the bulb is OFF.īut when using an Arduino Uno board for the same purpose (I have 12V, 5V, 3.3V and GND pins on the board so I give all of the supply from the board itself now not from the separate supply), when I connect 12V GND and 5V at the pin that goes to MCU pin the relay is making noise. For this purpose I use a 12V DC relay that can operate for 220V appliance according to its data sheet. My aim is to switch an electric bulb operating at 220v AC. ![]()
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