RS485/RS232/Serial transport class for mysensors.org

[Michal]

@radekzm
OK, what I did:
on one Arduino nano I have this sketch
https://github.com/mysensors/Arduino/blob/development/libraries/MySensors/examples/GatewaySerialRS485/GatewaySerialRS485.ino
on second arduino nano I have conbined two sketches:
https://github.com/mysensors/Arduino/blob/development/libraries/MySensors/examples/DistanceSensor/DistanceSensor.ino
and
https://github.com/mysensors/Arduino/blob/development/libraries/MySensors/examples/MotionSensorRS485/MotionSensorRS485.ino
and the results is:

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0 - Henrik Ekblad
 * 
 * DESCRIPTION
 * This is an example of sensors using RS485 as transport layer
 * 
 * Motion Sensor example using HC-SR501 
 * http://www.mysensors.org/build/motion
 * 
 * The transport uses AltSoftSerial to handle two serial links 
 * on one Arduino. Use the following pins for RS485 link
 * 
 *  Board          Transmit  Receive   PWM Unusable
 * -----          --------  -------   ------------
 * Teensy 3.0 & 3.1  21        20         22
 * Teensy 2.0         9        10       (none)
 * Teensy++ 2.0      25         4       26, 27
 * Arduino Uno        9         8         10
 * Arduino Leonardo   5        13       (none)
 * Arduino Mega      46        48       44, 45
 * Wiring-S           5         6          4
 * Sanguino          13        14         12 * 
 * 
 */


// Enable RS485 transport layer
#define MY_RS485

// Define this to enables DE-pin management on defined pin 
#define MY_RS485_DE_PIN 2

// Set RS485 baud rate to use
#define MY_RS485_BAUD_RATE 9600

#include <SPI.h>
#include <MySensor.h>
#include <NewPing.h>

#define CHILD_ID 1
#define TRIGGER_PIN  5  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     6  // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 300 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.
unsigned long SLEEP_TIME = 5000; // Sleep time between reads (in milliseconds)

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.
MyMessage msg(CHILD_ID, V_DISTANCE);
int lastDist;
boolean metric = true; 

void setup()  
{  
  metric = getConfig().isMetric;
}

void presentation() {
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Distance Sensor", "1.0");

  // Register all sensors to gw (they will be created as child devices)
  present(CHILD_ID, S_DISTANCE);
}

void loop()     
{     
  int dist = metric?sonar.ping_cm():sonar.ping_in();
  Serial.print("Ping: ");
  Serial.print(dist); // Convert ping time to distance in cm and print result (0 = outside set distance range)
  Serial.println(metric?" cm":" in");

  if (dist != lastDist) {
      send(msg.set(dist));
      lastDist = dist;
  }

  sleep(SLEEP_TIME);
}

On serial port (/dev/ttyUSB0) Controller (first nano) I see:
0;255;3;0;9;Starting gateway (RSNGA-, 2.0.0-beta)
0;255;3;0;9;Radio init successful.
0;255;3;0;14;Gateway startup complete.
0;255;3;0;9;Init complete, id=0, parent=0, distance=0

on serial port(/dev/ttyUSB1) in node is see:
...
Ping: 33 cm
Ping: 34 cm
Ping: 34 cm
Ping: 33 cm
Ping: 33 cm
Ping: 33 cm
Ping: 5 cm
Ping: 91 cm
Ping: 88 cm
Ping: 89 cm
......

But I expect to see some message on controller. What can I check? Do you see and mistakes ?

[Mariusz]

Hi,
I am new in mysensors and arduino however I already use domoticz with mysensors and rflink.
Everything is working fine however now I plan to renovate my house and I would like to put wire connection using max485 and arduino. Problem is that it is now working :( I have tried 1.5.4 version and also development branch. It seems that signal is not getting to gateway. I nothing see on arduino gateway except of initalization gateway. I have started to use two nano but I also tried combination nano and mega without success. I would be very appreciate if someone who done it could more describe how to make that it works.
I tried https://arduino-info.wikispaces.com/SoftwareSerialRS485Example and it works fine.
I use for nano combination pins 2 (de/re), 8 (ro),9(di)

[radekzm]

@Mariusz jak jesteś Polakiem ? Jeżeli tak to mogę Ci pomóc po polsku będzie łatwiej :)

[m26872]

@radekzm Please use private chat/PM if you don't intend everyone to read it.

[radekzm]

@m26872
I'm sorry and promises to improve :)

@Mariusz
In my case the solution was in MyConfig.h file (in my case C:\Program Files (x86)\Arduino\libraries\MySensors):

1. Disable function MY_DISABLED_SERIAL
   commenting lines 49
   // #define MY_DISABLED_SERIAL

2. Disable function MY_DEBUG
   commenting lines 36
   //#define MY_DEBUG

3. Correct connection is on my pictures enclosed in the above comment

Board | Transmit | Receive | PWM Unusable
Arduino Uno | 9 | 8 | 10 <----- Form https://www.pjrc.com/teensy/td_libs_AltSoftSerial.html .... (& other ATMEGA328)
Arduino Leonardo | 5 | 13 | (none)
Arduino Mega | 46 | 48 | 44, 45

DE and RE -> Pin 2
RO -> Pin 8
DI -> Pin 9

4. To check the hardware and connections run the "Example Program" from https://www.pjrc.com/teensy/td_libs_AltSoftSerial.html

5. Use development branch

[skatun]

@LeoDesigner
Hi, I am trying to do almost the same, but I would like to use softwareSerial instead of altsoft. The reason why I would do this is that i can barely fit the arduino nano inside my case, and an additional rs485 module would not fit and that I have 8 nodes connected on the softwareserial . I have tested software serial on arduino and it seems to work fine up to 15meters, I also adjusted the baudrate to 9600 since my node does not send out/receive large amount of data. I read that you did some work on software serial and were wondering if you could take a look at this thread.

[CrankyCoder]

Is there any how-to's on this transport class as far as the hardware goes? How does it work with multiple nodes? Is it like a ring pattern? or do all the nodes have to have a dedicated connection to the gateway.

[tbowmo]

Depends on your physical transport layer. I would say a multidrop link where everything is in parallel..

[hausinger]

Is it possible, to built a esp8266 wifi gateway and communicate GW to node with rs485?
In altsoft esp8266 is not decleared, so i can't use it out of the box.

Btw: I tested my_rs485 with nano as GW and Pro Mini as node, and it worked great. Thank you :)

[hek]

@hausinger I don't think so. I haven't heard of anyone trying. I guess you'd have to replace alt-soft-serial with something else.

[scalz]

@hausinger if you know about coding..

• plain C lib for esp8266, it can be adapted to work with Arduino Esp: https://github.com/plieningerweb/esp8266-software-uart
• or use stock arduino esp8266 software serial lib (https://github.com/plerup/espsoftwareserial), and inspire yourself from lib above, and code your CE pin management..

[Bart]

Hi,

Any reason why this lib is not using Serial1 or Serial2 on Arduino Mega 2560 instead of AltSoftSerial?

[hek]

@Bartek-Celary
No, not really. Just that not many that uses 2560.

[Bart]

How about adding the following define to use the Serial1/2 on Mega. I have not tested yet but assuming the AltSoftSerial lib has the same interface/functionality it should work.

#define MY_RS485_SERIAL Serial1

diff --git a/core/MyTransportRS485.cpp b/core/MyTransportRS485.cpp
index 814f721..ea35c9e 100644
--- a/core/MyTransportRS485.cpp
+++ b/core/MyTransportRS485.cpp
@@ -92,7 +92,11 @@ unsigned char _recSender;
 unsigned char _recCS;
 unsigned char _recCalcCS;
 
+#if defined(MY_RS485_SERIAL)
+HardwareSerial& _dev = MY_RS485_SERIAL;
+#else
 AltSoftSerial _dev;
+#endif
 
 
 unsigned char _nodeId;

[hek]

Looks like a neat solution. If it verifies ok, please create a pull request agains the development branch.

[lan]

I understand that the RS485 is a separate gateway to communicate. Is it also possible to have the wireless gateway and RS485 gateway combined?

[hek]

Currently, no..

[lan]

@hek Thanks for the quick response. I'm looking for some direction (this might not be the right forum).
I want to create a node to control my Itho Ecofan ventilation box. I now have a working program (thanks to the help of Rogier Reedijk The nodo now uses a CC1101 transceiver to control the box and thus uses the SPI bus. I'm looking for some direction to use this transmitter as part of my sensor network so I can control it from my Domoticz. Hope you can give me some directions how to proceed.

[hek]

Why do you need to hook it up to RS485 wired network? Can't you just forwards commands to the CC11001 from any radio node or the gateway?

[lan]

Is it then possible to use the two radio's on one node and share the SPI bus?