Added Example ModbusRTUTemperatureSensor

examples/RTU/ModbusRTUTemperatureSensor/ModbusRTUTemperatureSensor.ino

@@ -0,0 +1,54 @@
+/*
+  Modbus RTU Temeperature Sensor
+
+  This sketch show how to use the modbus library, in in order to sent a request to a slave RTU sensor
+  unit and read the responce packet return by the remote unit.
+
+  Circuit:
+   - MKR board
+   - TModbus RS485 Temperature
+   - MKR 485 shield
+     - ISO GND connected to GND of the Modbus RTU server
+     - Y connected to A/Y of the Modbus RTU sensor
+     - Z connected to B/Z of the Modbus RTU sensor
+     - Jumper positions
+       - FULL set to OFF
+       - Z \/\/ Y set to OFF
+
+  created 16 July 2018
+  by Sandeep Mistry
+*/
+
+#include <ArduinoModbus.h>
+
+float temperature, humidity;
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  Serial.println("Modbus Temperature Humidity Sensor");
+  // start the Modbus RTU client
+  if (!ModbusRTUClient.begin(9600)) {
+    Serial.println("Failed to start Modbus RTU Client!");
+    while (1);
+  }
+}
+
+void loop() {
+  //send a reading request to the RTU slave with id=1, type=HOLDING_REGISTERS address=0, number of values to read, nb=2
+  if (!ModbusRTUClient.requestFrom(1, HOLDING_REGISTERS, 0x00, 2)) {
+    Serial.print("failed to read registers! ");
+    Serial.println(ModbusRTUClient.lastError());
+  } else {
+    //if the request goes fine read the value with the read() function
+    short rawtemperature = ModbusRTUClient.read();
+    short rawhumidity = ModbusRTUClient.read();
+    temperature = rawtemperature / 10.0;
+    humidity = rawhumidity / 10.0;
+    Serial.println(temperature);
+    Serial.println(humidity);
+  }
+
+  delay(5000);
+}