Add initial example sketches

Author: sandeepmistry

examples/RS485Passthrough/RS485Passthrough.ino

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+/*
+  RS485 Passthrough
+
+  This sketch relays data sent and received between the Serial port and the RS485 interface
+
+  Circuit:
+   - MKR board
+   - MKR 485 shield
+     - ISO GND connected to GND of the 485 device
+     - Y connected to A of the 485 device
+     - Z connected to B of the 485 device
+     - A connected to Y of the 485 device
+     - B connected to Z of the 485 device
+     - Jumper positions
+       - FULL set to ON
+       - Z \/\/ Y set to ON, if the 485 device doesn't provide termination
+       - B \/\/ A set to ON, if the 485 device doesn't provide termination
+
+  created 4 July 2018
+  by Sandeep Mistry
+*/
+
+#include <RS485.h>
+
+void setup() {
+  Serial.begin(9600);
+  RS485.begin(9600);
+
+  // enable transmission, can be disabled with: RS485.endTransmission();
+  RS485.beginTransmission();
+
+  // enable reception, can be disabled with: RS485.noReceive();
+  RS485.receive();
+}
+
+void loop() {
+  if (Serial.available()) {
+    RS485.write(Serial.read());
+  }
+
+  if (RS485.available()) {
+    Serial.write(RS485.read());
+  }
+}
+

examples/RS485Receiver/RS485Receiver.ino

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+/*
+  RS485 Receiver
+
+  This sketch receives data over RS485 interface and outputs the data to the Serial interface
+
+  Circuit:
+   - MKR board
+   - MKR 485 shield
+     - ISO GND connected to GND of the 485 device
+     - A connected to A/Y of the 485 device
+     - B connected to B/Z of the 485 device
+     - Jumper positions
+       - FULL set to ON
+       - A \/\/ B set to OFF
+
+  created 4 July 2018
+  by Sandeep Mistry
+*/
+
+#include <RS485.h>
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  RS485.begin(9600);
+
+  // enable reception, can be disabled with: RS485.noReceive();
+  RS485.receive();
+}
+
+void loop() {
+  if (RS485.available()) {
+    Serial.write(RS485.read());
+  }
+}
+

examples/RS485Sender/RS485Sender.ino

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+/*
+  RS485 Sender
+
+  This sketch periodically sends a string over the RS485 interface
+
+  Circuit:
+   - MKR board
+   - MKR 485 shield
+     - ISO GND connected to GND of the 485 device
+     - Y connected to A of the 485 device
+     - Z connected to B of the 485 device
+     - Jumper positions
+       - FULL set to ON
+       - Z \/\/ Y set to ON
+
+  created 4 July 2018
+  by Sandeep Mistry
+*/
+
+#include <RS485.h>
+
+int counter = 0;
+
+void setup() {
+  RS485.begin(9600);
+}
+
+void loop() {
+  RS485.beginTransmission();
+  RS485.print("hello ");
+  RS485.println(counter);
+  RS485.endTransmission();
+
+  counter++;
+
+  delay(1000);
+}
+