Hi. At home we have wood heating system. I wish to display the smoke gas temperature on my node-red dashboard in form of a gauge. I want it connected to my raspberry pi. I have a smoke gas sensor called MAX6675 who work with Arduino. I managed to get it to display correct temp on Arduino IDE on my…

If it's a simple arduino (eg with just a serial port) then just use a serial in node in Node-red (making sure you turn off the Arduino IDE first) set to the same baud rate - and start by sending it to a debug node to see what arrives - once that works you can manipulate the date (ie split out temper…

Hi. Now I have connected my Arduino to my raspberry and I get a output from the analog pressure sensor in the debug node. "A0 : msg.payload : number 101". I tried creating pressure by blowing air against the sensor and the value went up and down, so I know its connected. Next challenge for me is …

That's true. Hope its a linear scale. I'll look into it and come back to you

[image] ole88: I have a smoke gas sensor called MAX6675 who work with Arduino. I managed to get it to display correct temp on Arduino IDE on my windows PC. Perhaps you mixed up the sensors names ? MAX6675 is the temperature sensor, not the gas smoke detector, right ?

I have both a MAX6675 temperature sensor (for my wood burner), and a pressure sensor (pressure transducer) for measuring the water pressure. Sorry for my bad structure.

Thanks. I am curious to see the outcome of the testing with the sensor pressure. I have no previous experience on this but it seems reasonable to me that the voltage read by the sensor has a linear correlation with the measured pressure. It would be great if you could publish the results of the tes…

I'll be busy with work the next days, but I managed to get some values that were close to the correct values. I'll make a new post when I have installed the sensor and keep you updated on how it goes.

Hi again. I need some help to make node-red display correct pressure. Now I get the analog value from the reader to node-red through mqtt. The value is currently 168. But it needs run through an equation to display bar. "float voltage = (sensorVal*5.0)/1024.0; _ Serial.print("Volts: ");_ _ …

See if the attached flow can help you. [{"id":"ea32e141.0bc61","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"cc68cc86.92fd","type":"inject","z":"ea32e141.0bc61","name":"","topic":"","payload":"0","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":170,"y…

Gas smoke sensor MAX6675, pressure sensor, arduino and raspberry pi

General

dceejay 8 January 2019 19:42 4

if it’s a linear scale you could use a range node to rescale the numbers you get to the right values.

As its already a number you should be able to feed it straight into a ui_gauge node for display

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Gas smoke sensor MAX6675, pressure sensor, arduino and raspberry pi

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