Could some kind soul please help me modify the attached sketch so as to enable me to transfer
integers (-32,768 to 32,767) between 2 Arduino Uno ( and also Mega).
I am using the attached sketch of Ralph Bacon because it was the only simple one I could find that actually works, but I cannot modify it to transmit integers.
My knowledge of coding is very very very basic so little words would help .
Thanks in advance
TRANSMIT
#include "Arduino.h"
// Library to allow a Serial port on arbitrary pins
#include <SoftwareSerial.h>
// These are the pins we'll be talking to the RS485 device on
#define RS485rx 6 // RS485 Receive pin
#define RS485Tx 7 // RS485 Transmit pin
#define RS485inout 5 // RS485 Transmit or Receive status
#define RS485Transmit HIGH
#define RS485Receive LOW
#define ledPin 13
#define baudRate 9600
// Define the RS485 object
SoftwareSerial RS485(RS485rx, RS485Tx);
// The data bytes we're sending or receiving
byte rxValue;
byte txValue;
// -----------------------------------------------------------------
// SETUP SETUP SETUP SETUP SETUP
// -----------------------------------------------------------------
void setup() /****** SETUP: RUNS ONCE ******/
{
// Debugging window
Serial.begin(9600);
// Set modes for pins
pinMode(ledPin, OUTPUT);
pinMode(RS485inout, OUTPUT);
// Ensure the on-board LED is off
digitalWrite(ledPin, HIGH);
// Set RS485 device to read initially
digitalWrite(RS485inout, RS485Receive);
// Set the baud rate. The longer the wire the slower you should
// set the transmission rate. Anything here:
// 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 31250,
// 38400, 57600, and 115200
// MUST BE THE SAME AS THE SENDER UNIT!
RS485.begin(baudRate);
}
// -----------------------------------------------------------------
// LOOP LOOP LOOP LOOP LOOP LOOP LOOP
// -----------------------------------------------------------------
void loop()
{
static String teststring = "12345"; // Serial Communication is easy!";
// Continually send the test string with a pause at the end
for (unsigned int cnt = 0; cnt < teststring.length(); cnt++) {
// Get the next character to send
txValue = teststring[cnt];
Serial.print("Sending:");Serial.println(char(txValue));
// Set the RS485 to transmit mode and send the value
digitalWrite(RS485inout, RS485Transmit);
RS485.write(txValue);
// small delay to allow transmission to complete
delay(1);
// Switch RS485 to receive mode
digitalWrite(RS485inout, RS485Receive);
delay(100);
// After each character is sent look for a received answer
if (RS485.available())
{
// LED flicker
digitalWrite(ledPin, HIGH);
// Read the incoming byte
rxValue = RS485.read();
// Display it on the Serial Monitor as a char (not an integer value)
Serial.print(" Got back:"); Serial.println(char(rxValue));
// Turn off LED
digitalWrite(ledPin, LOW); // Show activity
}
// Debugging delay so we can follow activity
delay(100);
}
// Entire string sent, longer delay between loops
//while (!Serial.available());
//while (Serial.available()){Serial.read();}
delay(2500);
RECEIVE
[code]
#include "Arduino.h"
// Library to allow a Serial port on arbitrary pins
#include <SoftwareSerial.h>
// These are the pins we'll be talking to the RS485 device on
#define RS485rx 6 // RS485 Receive pin
#define RS485Tx 7 // RS485 Transmit pin
#define RS485inout 5 // RS485 Transmit or Receive status
#define RS485Transmit HIGH
#define RS485Receive LOW
#define ledPin 13
#define baudRate 9600
// Define the RS485 object
SoftwareSerial RS485(RS485rx, RS485Tx);
// The data bytes we're sending or receiving
byte rxValue;
byte txValue;
// -----------------------------------------------------------------
// SETUP SETUP SETUP SETUP SETUP
// -----------------------------------------------------------------
void setup()
{
// Debugging window
Serial.begin(9600);
// Set modes for pins
pinMode(ledPin, OUTPUT);
pinMode(RS485inout, OUTPUT);
// Set RS485 device to read initially
digitalWrite(RS485inout, RS485Receive);
// Set the baud rate. The longer the wire the slower you should
// set the transmission rate. Anything here:
// 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 31250,
// 38400, 57600, and 115200
// MUST BE THE SAME AS THE SENDER UNIT!
RS485.begin(baudRate);
}
// -----------------------------------------------------------------
// LOOP LOOP LOOP LOOP LOOP LOOP LOOP
// -----------------------------------------------------------------
void loop()
{
// Is there something on the serial pin?
if (RS485.available())
{
txValue = RS485.read();
Serial.print("Received:");Serial.println(char(txValue));
// Turn on the on-board LED pin to show activity
digitalWrite(ledPin, HIGH);
// Set the direction pin to xmit (HIGH)
digitalWrite(RS485inout, RS485Transmit);
// This delay is REQUIRED for things to settle before transmission
delay(10);
// Send back a modified value
RS485.write(txValue);
// Wait for the transmission to complete.
// This delay is dependent on the baud rate. To calculate:
// delay = (baud rate / 10) * 2
int bufferDelay = (baudRate / 10) * 2 + 100;
delayMicroseconds(bufferDelay);
// Set the RS485 back to receive
digitalWrite(RS485inout, RS485Receive);
// Turn off built in LED pin
digitalWrite(ledPin, LOW);
}
}
}
[/code]
