NodeMCU 0.9 (ESP-12 Module) and serial monitoring help

Using Arduino Sensors
1

I am having issues getting serial monitoring to work:
upload: 115200
Board: NodeMCU 0.9 (ESP-12 Module)
IDE: 1.8.8
Lib: http://arduino.esp8266.com/stable/package_esp8266com_index.json

Is there an issue with the code preventing serial monitoring ? I need to adjust the digital write values on the moisture sensors however with out the serial monitoring it's been a cumbersome task.

I appreciate any feedback or help.

Thanks!

/****************************************
   Define Constants
 ****************************************/
#define sensor    A0       // Hook water sensor to pin A0 of NODEMCU module
#define LED       D2       // Led signals to relay that illuminates strobe LED
/****************************************
   Auxiliar Functions
 ****************************************/

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

/****************************************
   Main Functions
 ****************************************/

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(sensor, INPUT);   // Analog pin setup for read
  pinMode(LED, OUTPUT);    // LED pin as output for strobe LED circuit 

}

void loop() {
  float adcValue = analogRead(sensor);    // Read the ADC channel
//adjust adcValue so LED illuminates as needed. 
  if (adcValue > 400){
    digitalWrite(LED, HIGH);
  }
  if (adcValue < 200){
    digitalWrite(LED, LOW);
  }

}
2

How is your callback function getting called?

3 
void callback(char* topic, byte* payload, unsigned int length)

From the parameters this looks like an MQTT callback function but there is no mention of MQTT in the sketch

5

Test to print on serial monitor whatever you type

#define LED 2
char c ;


void setup() {
  Serial.begin(115200) ;
  Serial.println(".... initializing ....") ;
  pinMode(LED, OUTPUT) ;
}

void loop() {
  if(Serial.available() ) {
    c = Serial.read() ;
    Serial.print ( c ) ;
    digitalWrite( LED, ! digitalRead(LED) ) ;
  }
}
6

I get an error ?

/****************************************
Define Constants
/
#define sensor A0 // Hook water sensor to pin A0 of NODEMCU module
#define LED D2 // Led signals to relay that illuminates strobe LED
/
Auxiliar Functions
****************************************/

void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}

/****************************************
Main Functions
****************************************/

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
pinMode(sensor, INPUT); // Analog pin setup for read
pinMode(LED, OUTPUT); // LED pin as output for strobe LED circuit

}

void loop() {
float adcValue = analogRead(sensor); // Read the ADC channel
//adjust adcValue so LED illuminates as needed.
if (adcValue > 400){
digitalWrite(LED, HIGH);
}
if (adcValue < 200){
digitalWrite(LED, LOW);
}

}

7

Arduino: 1.8.8 (Windows 10), Board: "NodeMCU 0.9 (ESP-12 Module), 80 MHz, Flash, Disabled (new aborts on oom), Disabled, All SSL ciphers (most compatible), 32KB cache + 32KB IRAM (balanced), Use pgm_read macros for IRAM/PROGMEM, 4MB (FS:2MB OTA:~1019KB), v2 Lower Memory, Disabled, None, Only Sketch, 115200"

20211025-1_Simplex:41:6: error: redefinition of 'void setup()'
41 | void setup() {
| ^~~~~
Arduino\20211025-1_Simplex\20211025-1_Simplex.ino:23:6: note: 'void setup()' previously defined here
23 | void setup() {
| ^~~~~
20211025-1_Simplex:49:6: error: redefinition of 'void loop()'
49 | void loop() {
| ^~~~
Arduino\20211025-1_Simplex\20211025-1_Simplex.ino:29:6: note: 'void loop()' previously defined here
29 | void loop() {
| ^~~~
exit status 1
redefinition of 'void setup()'

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

8

You do?
What does it say?

9

How many setup() and loop() functions have you got in your sketch and how many tabs have you got in the current sketch in the IDE ?

10

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