ArduinoDmxRelay

Arduino Sketch to control a (low-active) Relay Card via the DMX bus

Equipment

• Arduino Uno or Mega
• CTC-DRA-10-R2 DMX Shield (https://www.dfrobot.com/product-984.html)
• Arduino 2-/4-/8-Channel Relay Card (https://www.sainsmart.com/8-channel-dc-5v-relay-module-for-arduino-pic-arm-dsp-avr-msp430-ttl-logic.html)
• A Computer with the Arduino IDE installed
• The Conceptinetics DMX Shield libary installed to your IDE

Usage

1. Put the DMX Shield on top of the Arduino.
2. Connect the Relays (IN1 - IN8) to the Arduinos Digital Outputs (e.g. 12 to 5) [Attention! Pins 0 to 4 are used by the shield].
3. Connect the Power Supply Pins on the Relay Card to a 5V power source (the Arduino 5V supply may not be enough and can get hot, especially on large relay cards).
4. Adjust the #define variables to your needs.
5. DMX_ADDRESS is the first address on the DMX bus to use
6. NUM_OF_RELAYS is the number of relay connected to the board
7. FIRST_RELAY_OUTPUT is the (lowest) output where the relay is connected
8. SWITCHING_THRESHOLD is the value where the relay should toggle
9. Control your relays by DMX!