Hello, first im a dangerous novice here. may not even be in the correct space. I am running my brewing system with node red. I am using 1 wire temp sensors for ketlles, and fermenters. i have the 3 sensors in brew house connected to raspberry pi and i am displaying temps properly in Node red. now t…

#include <OneWire.h> #include <ArduinoJson.h> #include <DallasTemperature.h> // Data wire is plugged into pin 3 on the Arduino #define ONE_WIRE_BUS 4 // Setup a oneWire instance to communicate with any OneWire devices OneWire oneWire(ONE_WIRE_BUS); // Pass our oneWire reference to Dallas Temperature…

the way above or #include <OneWire.h> #include <ArduinoJson.h> #include <DallasTemperature.h> // Data wire is plugged into pin 3 on the Arduino #define ONE_WIRE_BUS 4 // Setup a oneWire instance to communicate with any OneWire devices OneWire oneWire(ONE_WIRE_BUS); // Pass our oneWire reference to …

Hmm. Try it and see. :smiley: One of those alternatives won't compile!

If I remember right a -127 means the reading failed so you should ignore that, don’t send it to the Node-red at all (why bother) and just go and do another reading.

how would i code it to ignore the errors and only send valid info to serial

ok , man human error is so fatal! well i have now wired all sensors straight to the pi. i was originally using braided wire 18 gauge. that was obviously the reason why i couldn't get 7 sensors to work. they are all now wired in parallel with Phone wire. I was still getting messed up readings on a…

So I have them all connected to the pi now. Working but I get bad readings still. Someone mentioned using extra pull up resistors closer to the sensors. What size resistor should I use for those. How would I wire this up. How do those actually help, what are they doing.... Thanks

In the arduino code check the reading and see it is equal to -127 and ignore it if it is.

So which ever node you have reading the sensor send the output to a switch node and test the reading and only pass it on if it is not -127.

Node-red, raspberry pi and arduino communication issues

General

9toejack 26 February 2022 18:45 38

I'm actually not using arduino now,
By using the proper size lines the raspberry pi sees them all.
I need to fugue out to replace bad readings in node red.
I'm using the smoothing node. It helps but not when receiving bad readings.
As soon as I get laptop powered up I'll share my current flow.
Cheers

Topic		Replies	Views
Sensor data turned into null value after function node General function-node	26	354	22 October 2023
Quick note if you're a) reading multiple ds18b20's with a raspberry pi and b) struggling with flow stalls Hardware	22	5493	23 September 2020
Multiple Sensor Data Using Arduino Dashboard	9	3118	16 April 2019
Arduino- Node Red Dashboard Separate Sensor Data Logging Dashboard	20	8276	3 July 2018
Python Script into .JSON file for node red? Developing Nodes	92	3516	24 September 2021

Node-red, raspberry pi and arduino communication issues

Related topics