Thanks to Omega2 I am now able to control my DMX fog machine via SSH.

Hardware:

• Omega2+
• Arduino Dock 2
• Conceptinetics CTC-DRA-10-1 DMX RDM Shield for Arduino (bought on Ebay)
• Stairville AF-40 DMX Mini Fog Machine (or any device controllable via DMX)
• Standard DMX cable

Steps

• Plugged Omega2+ into dock
• Plugged DMX shield into dock
• Set TX & RX jumper on DMX shield to 'uart'
• Installed Arduino IDE
• Downloaded DMX Library for Arduino (https://sourceforge.net/projects/dmxlibraryforar)
• Connected fog machine and shield with the DMX cable
• Powered up fog machine and dock
• Compiled and uploaded Arduino code
• Set DMX channel of fog machine to 0x03 via dip switch

Arduino code:

#include <Wire.h>
#include <Conceptinetics.h>

#define I2C_ADDR 0x08
// Minimum is 1. Maximum depends on available memory.
#define DMX_CHANNELS_NUM 16
// Pin number to change read or write mode on the shield
#define DMX_RXEN_PIN 2

DMX_Master dmx_master(DMX_CHANNELS_NUM, DMX_RXEN_PIN);

void setup() {
  dmx_master.enable();
  
  Wire.begin(I2C_ADDR);
  Wire.onReceive(i2c_on_receive_handler);
}

void loop() {
}

void i2c_on_receive_handler(int bytes_num) {
  uint16_t channel = Wire.read();
  uint16_t value = Wire.read();
  dmx_master.setChannelValue(channel, value);
}

omega shell:

$ i2cset -y 0 0x08 0x03 0x00 # fog machine off
$ i2cset -y 0 0x08 0x03 0x80 # fog machine 50%
$ i2cset -y 0 0x08 0x03 0xFF # fog machine 100%
$ # i2cset -y 0 [arduino_i2c_addr] [dmx_channel] [dmx_value]

This setup might serve as a cheap alternative to the Open Source Lighting Board (OSL).
https://www.openlighting.org/
http://www.stellascapes.com/product-page/20736098-e4be-aef0-6cc7-3d69362cf5d5 ($75)

I am now planning to connect some DMX LED strips / bars and integrate the Omega as my new DMX/TCP interface into FHEM.

Thanks @Michael-Xie48 for your quick response

I am now able to switch the build-in LED on / off via I2C:

Arduino / ATmega

#include <Wire.h>

void setup() {
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, LOW);

Wire.begin(0x08);
Wire.onReceive(i2c_on_receive_handler);
}

void loop() {
}

void i2c_on_receive_handler(int bytes_num) {
digitalWrite(LED_BUILTIN, Wire.read());
}

Omega2

root@Omega:~# i2cset -y 0 0x08 0x01 # switch on
root@Omega:~# i2cset -y 0 0x08 0x00 # switch off

Thanks to Omega2 I am now able to control my DMX fog machine via SSH.

Hardware:

• Omega2+
• Arduino Dock 2
• Conceptinetics CTC-DRA-10-1 DMX RDM Shield for Arduino (bought on Ebay)
• Stairville AF-40 DMX Mini Fog Machine (or any device controllable via DMX)
• Standard DMX cable

Steps

• Plugged Omega2+ into dock
• Plugged DMX shield into dock
• Set TX & RX jumper on DMX shield to 'uart'
• Installed Arduino IDE
• Downloaded DMX Library for Arduino (https://sourceforge.net/projects/dmxlibraryforar)
• Connected fog machine and shield with the DMX cable
• Powered up fog machine and dock
• Compiled and uploaded Arduino code
• Set DMX channel of fog machine to 0x03 via dip switch

Arduino code:

#include <Wire.h>
#include <Conceptinetics.h>

#define I2C_ADDR 0x08
// Minimum is 1. Maximum depends on available memory.
#define DMX_CHANNELS_NUM 16
// Pin number to change read or write mode on the shield
#define DMX_RXEN_PIN 2

DMX_Master dmx_master(DMX_CHANNELS_NUM, DMX_RXEN_PIN);

void setup() {
  dmx_master.enable();
  
  Wire.begin(I2C_ADDR);
  Wire.onReceive(i2c_on_receive_handler);
}

void loop() {
}

void i2c_on_receive_handler(int bytes_num) {
  uint16_t channel = Wire.read();
  uint16_t value = Wire.read();
  dmx_master.setChannelValue(channel, value);
}

omega shell:

$ i2cset -y 0 0x08 0x03 0x00 # fog machine off
$ i2cset -y 0 0x08 0x03 0x80 # fog machine 50%
$ i2cset -y 0 0x08 0x03 0xFF # fog machine 100%
$ # i2cset -y 0 [arduino_i2c_addr] [dmx_channel] [dmx_value]

This setup might serve as a cheap alternative to the Open Source Lighting Board (OSL).
https://www.openlighting.org/
http://www.stellascapes.com/product-page/20736098-e4be-aef0-6cc7-3d69362cf5d5 ($75)

I am now planning to connect some DMX LED strips / bars and integrate the Omega as my new DMX/TCP interface into FHEM.

Thanks @Michael-Xie48 for your quick response

I am now able to switch the build-in LED on / off via I2C:

Arduino / ATmega

#include <Wire.h>

void setup() {
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, LOW);

Wire.begin(0x08);
Wire.onReceive(i2c_on_receive_handler);
}

void loop() {
}

void i2c_on_receive_handler(int bytes_num) {
digitalWrite(LED_BUILTIN, Wire.read());
}

Omega2

root@Omega:~# i2cset -y 0 0x08 0x01 # switch on
root@Omega:~# i2cset -y 0 0x08 0x00 # switch off

Hi,

I am using an Omega2+ with the Arduino Dock 2.

I would like to communicate with the ATmega via I2C.

While reading the docs I stumbled upon this article:

Using I2C in a Sketch
Right now the Onion Library joins the I2C bus with an address of 0x08 and listens for a write of 0xde 0xad (get it? 'dead' ha ha ha) when resetting. If you need a Sketch to use I2C, make sure to build this functionality into your I2C handling to comply with the Arduino Dock flashing procedure.
https://wiki.onion.io/Tutorials/Arduino-Dock/Using-the-Arduino-Dock

Does this still apply to the new Omega2 and Arduino Dock 2 ?

I can't find anything related in the Omega2 docs:
https://docs.onion.io/omega2-docs/arduino-dock-2.html

Onion Arduino Library:
https://github.com/OnionIoT/Onion-Arduino-Library/tree/master/Onion

Hi,

I am using the Omega2+ connected to an Arduino Dock 2 (powered via Micro USB).

Whenever I press the MCU_RESET button on the dock I lose the ssh connection and the Omega reboots.

Docs:

Micro-Controller Reset Button
In addition to the Omega’s reset button, the Arduino Dock 2 comes with a microcontroller reset button. This button can be used to reset the ATmega chip whenever you’d like. This will NOT reset the Omega.
https://docs.onion.io/omega2-docs/arduino-dock-2.html

Does anyone have a solution for this issue?