Struggling to use Atlas Peristaltic Pump on Node Red Pi for pH Control

[autonation]

Hi, I want to use my Raspberry Pi to control the pH of the water in my tank. I have followed the online tutorial using an Arduino which showed that the pumps work, but I want to do it all through the Pi using Node Red because I already use it to control water height, pumps and lighting. I know that I2c works in some capacity because I use a 4-20 mA ads1115 sensor to interpret the 4-20 mA signal coming from the pH transmitter.

The pumps are wired into the SCL and SDA GPIO pins of the Pi and getting Vcc from a power supply which has common ground with the Pi, the same way as the ads1115.

I am trying to use node-red-contrib-ezo but I'm really not sure how to use it correctly. I have tried using an inject node with

into the ezo node by trying to follow some of what is discussed here https://github.com/MaddyTP/node-red-contrib-ezo/issues/7/
I have also tried inserting a boolean true into the ezo node with D,[1] as the topic. With both I keep getting the error "Error: EREMOTEIO: remote I/O error, write"

I am not really sure if that means it's an issue with my wiring or with what I've done on node red.

Please can anyone help me

Thanks
Cai

 

[SPR1968]

I can’t help with the specific question but I can bump the thread to see if we can get you some attention

 

[autonation]

Hi, I am really sorry but I have just noticed the problem, dyslexic me! I accidentally wired the SCL and SDA wires the wrong way round!

 

[Ranjib]

I am assuming this is resolve now. The error indicates an i2c wiring issue.

 

[MaddyP]

Not sure how I missed this thread!

I am the author of node-red-contrib-ezo so free to tag me if you run into any other issues!