Hi, everyone. I have been working on this simple modbus TCP/IP project on Arduino uno r4 Wi-Fi board. Previously, I did a similar project in RTU and succeeded. The task is simple, I want to read my holding registers value from arduino r4 wifi as the slave to update when I short my jumper wire to A0, A1 and A2 on my PC (Qmodmaster).
Well, I have been working on my code past few days and come to realize most modbus tcp libraries are not compatible for this board. For example, I have used the
So, I have decided that I just make use of the inbuilt ESP 32 module and try access the wifi, just pull out the IP address and Voila should be seeing some values at my Qmodmaster. However, this is what I have ended up at.
my code
#ifdef ESP8266
#include <ESP8266WiFi.h>
#else //ESP32..
#include <WiFi.h>
#endif
#include <ModbusIP_ESP8266.h> // Use ModbusIP_ESP32.h for ESP32
// Replace with your network credentials
const char* ssid = "yolo";
const char* password = "******";
// Modbus Registers Offsets
const int PIN_ADD = 100;
// Used Pins
const int Pin1 = 0;
// GPIO1 (TX) is not recommended, use another GPIO
// ModbusIP object
ModbusIP mb;
void setup() {
// Initialize serial communication
Serial.begin(9600);
// Attempt to connect to WiFi network
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
//IPAddress ip = WiFi.localIP();
Serial.println("WiFi connected.");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
// Start Modbus TCP server
mb.server();
//pinMode(Pin, OUTPUT);
//mb.addCoil(PIN_COIL);
Serial.println("Modbus TCP Server started.");
//pinMode(A0, INPUT_PULLUP);
//pinMode(A1, INPUT_PULLUP);
mb.addHreg(PIN_ADD);
}
bool IsConnected = false;
void loop() {
mb.task();
mb.Hreg(PIN_ADD, analogRead(Pin1)); // Initiate Read Hreg from Modbus Server
delay(10);
}
