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NodeMCU v2 ESP8266 does not detect DS18B20 after uploading EasyESP - sensor address missing

skrobi2 111 4
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  • #1 21548366
    skrobi2
    Level 12  
    Hello esteemed group, I have a problem with node mcu v2 espb8266. I have uploaded the latest version of easy esp and I have connected the ds18b20 thermometer according to the schematic but the controller does not detect it, I should add that I have ordered several thermometers and it does not see any after configuration. Where do I look for the cause, because I really don't have the strength anymore, it doesn't show the sensor address as if it wasn't connected at all, I wanted to make a thermometer and so far nothing....
    NodeMCU v2 board with connected wires and a resistor, lying on a wooden table. .
    Close-up of a NodeMCU v2 ESP8266 module with attached wires and a connected DS18B20 temperature sensor. .
    Close-up of a NodeMCU v2 board with female jumper wires connected. .
    Screenshot of ESP Easy Mega configuration for DS18B20 sensor, device address not detected. .
    Device configuration screen in ESP Easy showing value readout settings and the value name tempera. .
    Screenshot of the ESP Easy Mega interface showing a temperature reading task on GPIO-12, with a value of 0.00. .
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  • #2 21548419
    DJ_KLIMA
    Level 24  
    Give a pull-up resistor between 3.3 kΩ and 4.7 kΩ, as you did not write what you used. It is best to test on a working sensor normally in a TO-92 housing.
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  • #3 21549204
    skrobi2
    Level 12  
    I checked the voltages on the pins and where there is voltage the sensor started to be visible but without the resistor. When I connect resistor 4.7 I have an impression that it makes a short circuit because the board heats up, I wanted to connect it in parasitic mode, but unfortunately it does not detect it in parasitic mode and I wanted to connect it with 2 wires. Is it possible to use this mode?
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  • #4 21549311
    DJ_KLIMA
    Level 24  
    4.7K, the "parasite" mode is described in the documentation, I don't know if easy esp supports it.
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