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Arduino - Potentiometer Triggers Servo Motor
In a previous tutorial, We have learned how to rotate servo motor according to the potentiometer's output value. In this tutorial, We are going to learn how to:
- If the potentiometer's analog value is greater than a threshold, rotate servo motor to 90 degree
- If the potentiometer's analog value is lower than a threshold, rotate servo motor back to 0 degree.
- If the potentiometer's output voltage is greater than a threshold, rotate servo motor to 90 degree
- If the potentiometer's output voltage is lower than a threshold, rotate servo motor back to 0 degree.
Hardware Required
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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Additionally, some links direct to products from our own brand, DIYables.
Additionally, some links direct to products from our own brand, DIYables.
About Servo Motor and Potentiometer
If you do not know about servo motor and potentiometer (pinout, how it works, how to program ...), learn about them in the following tutorials:
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
Arduino Code - Analog Threshold
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-potentiometer-triggers-servo-motor
*/
#include <Servo.h>
// constants won't change
const int POTENTIOMETER_PIN = A0; // Arduino pin connected to Potentiometer pin
const int SERVO_PIN = 9; // Arduino pin connected to Servo Motor's pin
const int ANALOG_THRESHOLD = 500;
Servo servo; // create servo object to control a servo
void setup() {
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(0);
}
void loop() {
int analogValue = analogRead(POTENTIOMETER_PIN); // read the input on analog pin
if(analogValue > ANALOG_THRESHOLD)
servo.write(90); // rotate servo motor to 90 degree
else
servo.write(0); // rotate servo motor to 0 degree
}
Quick Steps
- Connect Arduino to PC via USB cable
- Open Arduino IDE, select the right board and port
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to Arduino
- Rotate the potentiometer
- See the change of servo motor
Arduino Code - Voltage Threshold
Potentiometer's analog value is converted to voltage value, and then compared to voltage threshold to triggers servo motor
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-potentiometer-triggers-servo-motor
*/
#include <Servo.h>
// constants won't change
const int POTENTIOMETER_PIN = A0; // Arduino pin connected to Potentiometer pin
const int SERVO_PIN = 9; // Arduino pin connected to Servo Motor's pin
const float VOLTAGE_THRESHOLD = 2.5; // Voltages
Servo servo; // create servo object to control a servo
void setup() {
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(0);
}
void loop() {
int analogValue = analogRead(POTENTIOMETER_PIN); // read the input on analog pin
float voltage = floatMap(analogValue, 0, 1023, 0, 5); // Rescale to potentiometer's voltage
if(voltage > VOLTAGE_THRESHOLD)
servo.write(90); // rotate servo motor to 90 degree
else
servo.write(0); // rotate servo motor to 0 degree
}
float floatMap(float x, float in_min, float in_max, float out_min, float out_max) {
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
Video Tutorial
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