ESP32 - Potentiometer Triggers Relay
We are going to learn how to:
- If the potentiometer's analog value is greater than a threshold, turn relay on
- If the potentiometer's analog value is lower than a threshold, turn relay off
- If the potentiometer's output voltage is greater than a threshold, turn relay on
- If the potentiometer's output voltage is lower than a threshold, turn relay off
By connecting relay to light bulb, led strip, motor or actuator... We can use the potentiometer to control light bulb, led strip, motor or actuator...
|1||×||ESP-WROOM-32 Dev Module|
|1||×||Micro USB Cable|
|1||×||Warning Light Bright Waterproof|
|1||×||12V Power Adapter|
About Relay and Potentiometer
If you do not have knowledge of relay and potentiometer (pinout, how they work, how to connect them to ESP32, how to program for them...), learn about them in the following tutorials:
Image is developed using Fritzing. Click to enlarge image
ESP32 Code - Analog Threshold
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE, select the right ESP32 board and COM port
- Copy the above code and paste it to Arduino IDE
- Click Upload button on Arduino IDE to compile and upload code to ESP32 board
- Rotate the potentiometer
- See the change of relay's state
Read the line-by-line explanation in comment lines of source code!
ESP32 Code - Voltage Threshold
Potentiometer's analog value is converted to voltage value, and then compared to voltage threshold to triggers relay
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Potentiometer and Relay on Commercial Products
※ NOTE THAT:
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