[Solved] Using two ESP32 – Reading and Writing data from Thingspeak to control LIGHT

NS1518 Asks: Using two ESP32 – Reading and Writing data from Thingspeak to control LIGHT
What I need How to read and write data from Thingspeak the correct way using ESP32.


  1. One ESP32 controlling 5 lights with push buttons
  2. Other ESP32 connected to touch screen display controls lights remotely
  3. The data is written/read from the same data source of Thingspeak cloud.

I’m working on a ESP32 based project in which I am controlling 5 AC power Lights with each light having it’s own push button. The project can be controlled remotely using a touch screen Nextion display which is again controlled with another ESP32. The light state (ON/OFF) data is stored on Thingspeak cloud.

Problem: As the lights can be controlled manually using push buttons as well as remotely using touch display through Thingspeak, I am having difficulty designing the read and write architecture.

Presently I am running a code on ESP32 using a debounce for push button library (JC_Button.h). Every change of button state triggers switches the light ON/OFF and update the state on cloud. Similarly, there is a function that receives the state from cloud and updates the light ON/OFF. Problem is I am not able to properly design the system where I can clearly show seamlessly manage read and write control.

I am not sure how to design the architecture so that my read and write led state is properly visible on the lights to me when I physically press the button as well as if someone monitors and control the setup remotely.

Code snippet

int deBounceState1 = 0; /* If there is change in push button state, 
block reading data from cloud -> Update cloud with new status -> 
Read data from cloud and set the light state*/

int state0, state1, state2, state3 = 0; // Variable to store state of lights 
int stateR0, stateR1, stateR2, stateR3 = 0; // Read light state from cloud

//Function that reads button state
btn1.read(); // Reads the state of the button
if (btn1.changed()) {
  deBounceState1 = 1;
  digitalWrite(light1, btn1.toggleState());
  //Serial.println("Button 1 Pressed............");
} else {
  deBounceState1 = 0;
  //Serial.println("Button 1 no change");

void loop() {
   if (deBounceState1==1 || deBounceState2==1 || deBounceState3 ==1 || deBounceState4 ==1){

void delayLoop() {
   static long currentMillis;
   static byte statCounter = 0;
   if (millis() - currentMillis >= interval)
      if (statCounter> 10)
       statCounter = 0;
      currentMillis = millis();

I know the information is not enough to explain the problem but please feel free to ask questions.


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