I am trying to switch the seeed relay Board (4 relays) with node-red-contrib-i2c. Does anybody already successfully run this relay board with node-red? I only have a Python program and have problems to extract the command bytes.
[LInk to Python code]
(https://github.com/johnwargo/Seeed-Studio-Relay-Board/blob/master/relay_lib_seeed.py)
wiki.seeedstudio.com/Raspberry_Pi_Relay_Board_v1.0/
Any help appreciated
You could run the Python script from node-red with the exec node.
it's a demo code and runs all relays. That is not what I want. Actually, as I understand from the demo program, I have to use 3 bytes to send to the board. On 2 of them they are doing some bit shifting. It looks like a logic "or" and "and". I am not good enough in Python to understand what the result should be.
Actually sending a buffer (only 0s and 1s) with the I2C node containing 3 bytes should be the way to go.
Just had a quick look at the code:
Device address is 0x20
DEVICE_REG_MODE1 = 0x06
relay 1 =1, 2=2, 3=4, 4=8 (Binary)
Try sending 0x20, 0x06, 0x1 to turn the first relay on
and 0x20, 0x06, 0x0 to turn it off. No guarantees.
Thats address 0x20
Register 0x06
data 0x1
Data might be inverted 0=on 1=off
Thanks for your support. I have it running with node red since yesterday. Funny thing is that relay 2 = 4 and relay 3 is 2. As soon as I have made my flows a bit nicer I will post them here. Switching a single relay is also a bit tricky as you first have to get the current status of the relays on the board and then change only the bit of the relay you want to switch and send all four bits back to the board. btw node-red-contrib-i2c works perfectly.
Yes, classic bit masking. I had almost forgotten how to do it! Glad you got it working!
with the help of a loupe I just found out, that the sequence of the leds is 1324. this means that you where right with the relay numbering! I thought they were in a sequence.
Can you try this please:
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here my flows for the Seeed Raspi Relay shield:
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Can easily be integrated with websocket or MQTT
I will try your flow and let you know my results soon.
Thanks to ghayne's input I fine tuned my flow and added MQTT and websocket connection demo.
Have fun with it 
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