I got a flow working great... buttons, blinky lights... GPIO... all good. I added an ADS1115 analog to digital chip and you MUST connect the channels in a daisy-chain combination or it will fail Node Red so hard you will need to go to the directory and delete the file. (Lesson learned... backup...b…

errrr - surely you can tap the result from each of those ADC nodes as they go past ? (maybe use a join node to collect all 4 readings ?

Even better... David Burrows (the guy that created the module node-red-contrib-anolog-to-digital-converter-raspberry-pi Jumped on SLACK and we beat on it for about an hour or more. It resulted in update 4.22 and 4.23 which fixed a few issues. (We found the thingie that crashes Node Red too!) The…

I did notice one odd thing that I cannot explain... it sends out the four A/D channels as: 2.212345678 ADC-A 0.545686776 ADC-B 0.555699726 ADC-C 0.514765869 ADC-D So all I have to do is identify the channel name, then pull the attached voltage. I only have one potentiometer connected now, and i…

Hi Jerry, Have you thought about using a slave to sample your analog values?? A number of people on the forum use Wemos D1 Minis (ESP8266-based microcontrollers) to capture and control things (rather than using a Raspberry Pi). Personally I use Wemos D1 Minis flashed with ESP Easy firmware. You c…

[image] Askjerry: if ( MESSAGE.value.match(/ADC-A/g) == "ADC-A" ) {chan0.value = parseFloat(event.data); } Just wondering,,, You say event.data is a string, typically like "2.212345678 ADC-A" Would it not be safer to first create an array to pick the voltage level value from? Like: chan0.…

DynamicDave - That is a very good idea. Actually I can directly program Atmel AVR chips in BASCOM which is a version of BASIC. (Don't laugh!) I have been using that compiler for about 22 years now, it makes the same HEX files that you would see on an Arduino only the bootstrap loader is not require…

methinks there may be a lot of extra conversions going on here - what is the full msg that comes out of one of the ADC nodes ? Does it have other properties as well as the payload ? I'm sure you would be better trying to send a json like string across your websocket which would much easier to parse …

The nodes are laid out like this... [image] Here is an actual message after processing... 2.2515687124240853 ADC-A The HTML page looks like this... [image] You can see that channel-A has just sent data and was properly parsed. I am as of yet unfamiliar with json... I'll start reading about i…

can you add another debug node (or copy /paste the existing one) and attach to the output of one of the ADC nodes and show us what that returns ?

[image] Askjerry: it will fail Node Red so hard you will need to go to the directory and delete the file. Do you mean node-red kept crashing when it started the flows so you couldn't edit the flows file? If so then possibly starting it with the --safe option would have saved the situation.

I2C ADS1115 ADC Chip - Not all channels in data

General

Askjerry 11 April 2020 20:33 9

The nodes are laid out like this...

Here is an actual message after processing...
2.2515687124240853 ADC-A
The HTML page looks like this...

You can see that channel-A has just sent data and was properly parsed.

I am as of yet unfamiliar with json... I'll start reading about it.

Thanks,
Jerry

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I2C ADS1115 ADC Chip - Not all channels in data

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