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Published January 27, 2025 © GPL3+

Servo Temperature Display using ESP32

The project I made is Servo Temperature Display using ESP32, the visualization is with the servo needle pointing to the weather icon indicat

IntermediateProtip5 hours173

Things used in this project

Hardware components

ESP32 ESP-32S

MOTOR SERVO TOWER PRO MG995 MG 995 FULL METAL 180 DERAJAT

Resistor 10k ohm

thermistor NTC 10k 10

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Multitool, Screwdriver

Hot glue gun (generic)

Breadboard, 830 Tie Points

Premium Male/Male Jumper Wires, 40 x 3" (75mm)

Premium Female/Male Extension Jumper Wires, 40 x 6" (150mm)

cardboard box

Scissor, Electrician

Tape, Clear

cable type C to USB

Story

STORY

The project I made is Servo Temperature Display using ESP32, the visualization is with the servo needle pointing to the weather icon indicating whether it is cold, warm or hot, why I made this project is because this project is needed in a closed room, how do I find out the temperature in the room itself, based on the servo needle that points to the weather icon.

HOW DOES IT WORK

The way the thermistor works is to read the surrounding temperature. If you bring a match closer to the thermistor, the servo needle will slowly move to the sun icon. If you don't bring it closer, it will return to its original position to adjust the temperature of the surrounding area.e surrounding area.

Schematics

Code

Source Code

#include <ESP32Servo.h>

const double VCC = 3.3;             // NodeMCU on board 3.3v vcc
const double R2 = 10000;            // 10k ohm series resistor
const double adc_resolution = 4095; // 10-bit adc

const double A = 0.001129148;   // thermistor equation parameters
const double B = 0.000234125;
const double C = 0.0000000876741; 
float ptc,tc;


Servo myservo;
int pos = 0;
int servoPin = 5;
void setup() {
  Serial.begin(9600);  /* Define baud rate for serial communication */
 
  myservo.setPeriodHertz(50);    // standard 50 hz servo
  myservo.attach(servoPin, 500, 2400);
  Serial.println();
   myservo.write(0); delay(800);
   myservo.write(180); delay(800);
   myservo.write(0); delay(800);
   Serial.println("sets");
   myservo.write(180); delay(5000);
   Serial.println("set");
}

void loop() {
  double Vout, Rth, temperature, adc_value; 
for ( int i = 0; i < 100; i++ )
{
  adc_value = analogRead(35);
  Vout = (adc_value * VCC) / adc_resolution;
  Rth = (VCC * R2 / Vout) - R2;

/*  Steinhart-Hart Thermistor Equation:
 *  Temperature in Kelvin = 1 / (A + B[ln(R)] + C[ln(R)]^3)
 *  where A = 0.001129148, B = 0.000234125 and C = 8.76741*10^-8  */
  temperature = (1 / (A + (B * log(Rth)) + (C * pow((log(Rth)),3))));   // Temperature in kelvin

  temperature = temperature - 273.15;  // Temperature in degree celsius
  
  tc=temperature;
  ptc=ptc+tc;
  //Serial.print(temperature);Serial.print("      ");Serial.println(ptc); 
  delayMicroseconds(500);
  }

  Serial.print("Temperature = ");
  Serial.print(ptc/100);
  Serial.print(" degree celsius");
  if((ptc/100)>100)     { pos=0;}
  else if ((ptc/100)<0) { pos=180;}
  else { pos = map((ptc/100),0,100, 180,0);}
 
  Serial.print("  Servo pos: "); Serial.print(pos);Serial.println("*");
  myservo.write(pos);
   delay(1000);
   ptc=0;

}

Credits

Rizki Ramadhan446

1 project • 0 followers

Contact

Hendra Kusumah

36 projects • 141 followers

Love hacking and making new things from IoT to robotics

Contact

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Servo Temperature Display using ESP32