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I am using TX and RX pin of arduino connect to RX and TX pin of NodeMCU. The data does not received, the data upload to thingspeak is zero. How to send data from arduino to NodeMCU? I ady using the software serial (D2,D3) for other device. Can I straight away use TX and RX pin? This is my arduino coding: { #include <SoftwareSerial.h> #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> //#include <AltSoftSerial.h> // For the i2c supported Oled display module which is 128x64 #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 64 // OLED display height, in pixels #define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin) Adafruit_SSD1306 display(128, SCREEN_HEIGHT, &Wire, OLED_RESET); //declare the digital to control the operation of RS-485 modbus #define RE 8 // The following are the Inquiry frames which are send to the NPK sensor //for reading the Nitrogen, Phosphorus, and Potassium values // We defined three arrays with names nitro_inquiry_frame, phos_inquiry_frame, and pota_inquiry_frame // Each inquiry frame have 8 values const byte nitro_inquiry_frame[] = {0x01,0x03, 0x00, 0x1e, 0x00, 0x01, 0xe4, 0x0c}; const byte phos_inquiry_frame[] = {0x01,0x03, 0x00, 0x1f, 0x00, 0x01, 0xb5, 0xcc}; const byte pota_inquiry_frame[] = {0x01,0x03, 0x00, 0x20, 0x00, 0x01, 0x85, 0xc0}; char buffer[40]; byte values[11]; SoftwareSerial modbus(2,3); //AltSoftSerial espSerial; // we will need three variables of the type byte to store the values of // Nitrogen, phosphorus, and Potassium. byte nitrogen_val,phosphorus_val,potassium_val; void setup() { Serial.begin(115200); modbus.begin(4800); //espSerial.begin(1200); pinMode(RE, OUTPUT); display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //initialize with the I2C addr 0x3C (128x64) delay(500); display.clearDisplay(); display.setCursor(25, 15); display.setTextSize(1); display.setTextColor(WHITE); display.println(" NPK Sensor"); display.setCursor(25, 35); display.setTextSize(1); display.print("Initializing"); display.display(); } void loop() { nitrogen_val = nitrogen(); delay(100); phosphorus_val = phosphorous(); delay(100); potassium_val = potassium(); delay(100); //------Sending Data to ESP8266--------// sprintf(buffer,"*%03d%03d%03d#",nitrogen_val,phosphorus_val,potassium_val);//Sending *xxxxxxxxx# to esp8266 Serial.println(buffer); delay(2000); //------------------------------------// // The following code is used to display the data on the Oled display display.clearDisplay(); display.setTextSize(2); display.setCursor(0, 5); display.print("N: "); display.print(nitrogen_val); display.setTextSize(1); display.print(" mg/kg"); display.setTextSize(2); display.setCursor(0, 25); display.print("P: "); display.print(phosphorus_val); display.setTextSize(1); display.print(" mg/kg"); display.setTextSize(2); display.setCursor(0, 45); display.print("K: "); display.print(potassium_val); display.setTextSize(1); display.print(" mg/kg"); display.display(); } byte nitrogen(){ digitalWrite(RE,HIGH); delay(10); if(modbus.write(nitro_inquiry_frame,sizeof(nitro_inquiry_frame))==8){ digitalWrite(RE,LOW); // When we send the inquiry frame to the NPK sensor, then it replies with the response frame // now we will read the response frame, and store the values in the values[] arrary, we will be using a for loop. for(byte i=0;i<7;i++){ //Serial.print(modbus.read(),HEX); values[i] = modbus.read(); // Serial.print(values[i],HEX); } Serial.println(); } return values[5]; // returns the Nigtrogen value only, which is stored at location 4 in the array } byte phosphorous(){ digitalWrite(RE,HIGH); delay(10); if(modbus.write(phos_inquiry_frame,sizeof(phos_inquiry_frame))==8){ digitalWrite(RE,LOW); for(byte i=0;i<7;i++){ //Serial.print(modbus.read(),HEX); values[i] = modbus.read(); // Serial.print(values[i],HEX); } Serial.println(); } return values[5]; } byte potassium(){ digitalWrite(RE,HIGH); delay(10); if(modbus.write(pota_inquiry_frame,sizeof(pota_inquiry_frame))==8){ digitalWrite(RE,LOW); for(byte i=0;i<7;i++){ //Serial.print(modbus.read(),HEX); values[i] = modbus.read(); //Serial.print(values[i],HEX); } Serial.println(); } return values[5]; } } if true #include <SoftwareSerial.h> #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> //#include <AltSoftSerial.h> // For the i2c supported Oled display module which is 128x64 #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 64 // OLED display height, in pixels #define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin) Adafruit_SSD1306 display(128, SCREEN_HEIGHT, &Wire, OLED_RESET); //declare the digital to control the operation of RS-485 modbus #define RE 8 // The following are the Inquiry frames which are send to the NPK sensor //for reading the Nitrogen, Phosphorus, and Potassium values // We defined three arrays with names nitro_inquiry_frame, phos_inquiry_frame, and pota_inquiry_frame // Each inquiry frame have 8 values const byte nitro_inquiry_frame[] = {0x01,0x03, 0x00, 0x1e, 0x00, 0x01, 0xe4, 0x0c}; const byte phos_inquiry_frame[] = {0x01,0x03, 0x00, 0x1f, 0x00, 0x01, 0xb5, 0xcc}; const byte pota_inquiry_frame[] = {0x01,0x03, 0x00, 0x20, 0x00, 0x01, 0x85, 0xc0}; char buffer[40]; byte values[11]; SoftwareSerial modbus(2,3); //AltSoftSerial espSerial; // we will need three variables of the type byte to store the values of // Nitrogen, phosphorus, and Potassium. byte nitrogen_val,phosphorus_val,potassium_val; void setup() { Serial.begin(115200); modbus.begin(4800); //espSerial.begin(1200); pinMode(RE, OUTPUT); display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //initialize with the I2C addr 0x3C (128x64) delay(500); display.clearDisplay(); display.setCursor(25, 15); display.setTextSize(1); display.setTextColor(WHITE); display.println(" NPK Sensor"); display.setCursor(25, 35); display.setTextSize(1); display.print("Initializing"); display.display(); } void loop() { nitrogen_val = nitrogen(); delay(100); phosphorus_val = phosphorous(); delay(100); potassium_val = potassium(); delay(100); //------Sending Data to ESP8266--------// sprintf(buffer,"*%03d%03d%03d#",nitrogen_val,phosphorus_val,potassium_val);//Sending *xxxxxxxxx# to esp8266 Serial.println(buffer); delay(2000); //------------------------------------// // The following code is used to display the data on the Oled display display.clearDisplay(); display.setTextSize(2); display.setCursor(0, 5); display.print("N: "); display.print(nitrogen_val); display.setTextSize(1); display.print(" mg/kg"); display.setTextSize(2); display.setCursor(0, 25); display.print("P: "); display.print(phosphorus_val); display.setTextSize(1); display.print(" mg/kg"); display.setTextSize(2); display.setCursor(0, 45); display.print("K: "); display.print(potassium_val); display.setTextSize(1); display.print(" mg/kg"); display.display(); } byte nitrogen(){ digitalWrite(RE,HIGH); delay(10); if(modbus.write(nitro_inquiry_frame,sizeof(nitro_inquiry_frame))==8){ digitalWrite(RE,LOW); // When we send the inquiry frame to the NPK sensor, then it replies with the response frame // now we will read the response frame, and store the values in the values[] arrary, we will be using a for loop. for(byte i=0;i<7;i++){ //Serial.print(modbus.read(),HEX); values[i] = modbus.read(); // Serial.print(values[i],HEX); } Serial.println(); } return values[5]; // returns the Nigtrogen value only, which is stored at location 4 in the array } byte phosphorous(){ digitalWrite(RE,HIGH); delay(10); if(modbus.write(phos_inquiry_frame,sizeof(phos_inquiry_frame))==8){ digitalWrite(RE,LOW); for(byte i=0;i<7;i++){ //Serial.print(modbus.read(),HEX); values[i] = modbus.read(); // Serial.print(values[i],HEX); } Serial.println(); } return values[5]; } byte potassium(){ digitalWrite(RE,HIGH); delay(10); if(modbus.write(pota_inquiry_frame,sizeof(pota_inquiry_frame))==8){ digitalWrite(RE,LOW); for(byte i=0;i<7;i++){ //Serial.print(modbus.read(),HEX); values[i] = modbus.read(); //Serial.print(values[i],HEX); } Serial.println(); } return values[5]; } end Have you taken a look at the library <https://github.com/mathworks/thingspeak-arduino here.> There are numerous examples in that git repository that can help you get started. arduino nodemcu eps 8266 iot project