Programming for controlling polymer dispersed liquid crystal film transparency/opacity depending on temperature

Code
#1

Hi guys,
I am new to programming and my background is in Mechanical Engineering. Recently I have been working on a project to implement the use of PDLC film for thermal management. I am using an ESP32 microcontroller with LM35 sensors. I am trying to use the code for the PID controller in my sketch so that I can regulate the transparency/ opacity of the PDLC film depending on the temperature inside and outside of the vehicle cabin. Can anyone help me out? Thanks.

1 Like
#2

Could you share the code you have so that we can see which parts you need help with? Is it the code to compute the PID values?

#3

This is the code which I was able to come up with till now.

//**
#include <PID_v1.h>
#include “LM35.h”
#define PIN_INPUT 13
#define PIN_OUTPUT 2
#define LM35_1_PIN_VOUT 13
#define LM35_2_PIN_VOUT 14

LM35 lm35_1(LM35_1_PIN_VOUT);
LM35 lm35_2(LM35_2_PIN_VOUT);

float temp1, temp2;
int tempPin1 = 13;
int tempPin2 = 14;
double Setpoint, Input, Output;
double Kp=2, Ki=5, Kd=1;
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, DIRECT);

void setup()
{
Input = analogRead(PIN_INPUT);
Setpoint = 100;
myPID.SetMode(AUTOMATIC);
Serial.begin(115200);
pinMode(2, OUTPUT);
}

void loop()
{
Input = analogRead(PIN_INPUT);
myPID.Compute();

temp1 = analogRead(tempPin1);
temp1 = (1.515temp11000)/(102410);
temp2 = analogRead(tempPin2);
temp2 = (1.515temp21000)/(102410);

Serial.print(myPID);
Serial.print("Inside_Temperature = “);
Serial.println(temp1);
Serial.print(“Deg C”);
Serial.print(”\tOutside_Temperature = ");
Serial.println(temp2);
Serial.print(“Deg C”);
Serial.println();
if (temp1>=30)
{
myPID.Compute();
digitalWrite(2, HIGH);
Serial.print(“Pdlc is on \n”);
}
else
{
digitalWrite(2 , LOW);
Serial.print(“Pdlc is off \n”);
}
delay(100);
}
**//
I want to implement the PID in such a way that it will take input from one sensor and such that it will propogate the input according to a setpoint. The main aim is to control the “Polymer dispersed liquid crystal” film’s transparency/opacity depending on the temperature.

1 Like