![]() (Approximately the same amount of power/heat has to be dissipated by a solid state relay that's controlled by 120VAC. You can also use a regular opto-isolator, but because of the voltage-drop across the input-resistor (almost the full line-voltage) you need a ~2W resistor and it will generate some heat (Power = Voltage x Current). LCD is connected to display the value of temperature. A SSR designed to switch AC won't work with DC and sometimes a 120VAC or 240VAC SSR won't switch low-voltage AC. To make load 'ON' load is connected through a transistor and relay. If you use a SSR make sure to check the output-side specs. ![]() This is the working of the transistor as a switch. With 44-key remote control and a 3-button switch, you can easily adjust. For a PNP transistor, the Emitter potential must be +ve with respect to the Base. Connect the positive side of your audio signal to BASE on the transistor. You can get a regular relay with a 120VAC coil. The definition of saturation region or ON mode when using a bipolar NPN transistor as a switch as being, both the junctions are forward biased, IC Maximum, and VB > 0.7v. Have working with SSRs before to turn on power, just never tried to sense if it is turned on. What? A light sensor (or your eye) is the best way to know if the light is working or not, regardless of the cause. I could use a light sensor but am concerned if the bulb is burned out I would not be notified. When the bulb lights up, I want the arduino to react.
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