Hello I am currently working on a project using an Arduino Uno, RTD temperature sensor, relay, and 1500W heating element. The basics of it is the Arduino will read in a temperature from the RTD, and based on that reading will or will not send out 5V to the relay which will allow the heating element to start up. The heating element will be powered by a 120V GFCI outlet. This is all working just fine, however I am trying to hold the temperature for a long period of time with +- .5 degree F and I don't think simply turning the heating element on/off will be able to give me that precision. What would be the best way to control the power to the heating element based on the temperature read of the RTD. What sort of electronics are out there that can vary the input into the heating element based on an output from the Arduino. Any point in the right direction would be greatly appreciated. Thanks.
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