Arduino + NodeMcu + FireBase

Projects Programming
1

currently im working on a project that integrate ardunio nodemcu and firebase together. I am using serial communication between arduino and nodemcu. But i have encounter some problems.

Im using a MQ-2 Gas Sensor to sense the input, when i test with analogRead it gave about value "200" data.
So I wrote this code in arduino.

void setup() {
  Serial.begin(9600);
  mySerial.begin(115200);
 
  //Gas sensor
  pinMode(GasSensor, INPUT);

}

void loop() {
int FF = analogRead(GasSensorLv2_R) ;

if ( FF < 200 )
{
  GasF=0;
  condition=0;
 }
if ( FF > 300)
{
  GasF=1;
  condition=1;
}

if ( condition != lastcondition )
{
  mySerial.write ( GasF );
  delay(200);
  lastcondition = condition; 
}
}

And for the nodemcu part

void loop() {
if (Serial.available() > 0)
    {
    Sensor = Serial.read();
    Firebase.setInt("Sensor",Sensor);
    }

But this eventually result in the firebase keep updating "0" and "1" simultaneously. Even i increase the threhold value untill 800 it was the same. Anyone know what happened?

2

without the complete code it is still a guessing game, but if mySerial is as swSerial, 115200 is a BAUD rate likely not to be reliable, also you should really do an error-check on Serial.values before using the results, for debugging i suggest you send back some info to the mySerial and then onto the Serial.

3

Arduino logic is 5V, NodeMCU (ESP8266) logic is 3.3V. This can cause serial com problems.
Also maybe try Serial.parseInt (Serial.parseInt() - Arduino Reference) when working with numbers on the Serial.