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Questions tagged [ds18b20]

DS18B20 is a digital temperature sensor.

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Arduino Uno - temperature sensor DS18B20 not responding

I try to use a new DS18B20+ temperature sensor (sealed water proof version). It doesn't work. My own code doesn't work, examples from DallasTemperature Library don't work, example from OneWire ...
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910 views

ESP8266 can't read parasitic DS18B20 temperature (reset during conversion, 85°C)

tl;dr at the end I was running two DS18B20+PAR temperature sensors without any problems for the last two years on an ESP-01 module running on 3.3V on GPIO 2 using a 4.7K pullup resistor. Now, ...
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122 views

Interference in readings

I have an project which control a heat exchanger. I read 4 temperature sensors DS18B20, a distance with HC-SR04 Ultrasonic Sensor, and a flow with YF-S201 (with attach interrupt). I can turn on and ...
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281 views

1-wire bus apparently working, but OneWire::reset() fails

I encounter a strange thing. I have a star shaped topology of 1-wire devices. Every branch (there are four of them) of the star has a DS2413 and a DS18B20 at its end. The DS18B20 is supplied with a +...
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57 views

OneWire with DS18B20 digital sensor only works on the I2C (20 and 21) pins of my Mega?

I am using an Arduino Mega to read a DS18B20 temperature sensor using the OneWire library in the code below which I got here: #include <OneWire.h> #define DS18S20_Pin 20 //DS18S20 Signal pin ...
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1answer
82 views

Detect DS18B20 sensors and correctly assign them to relays

I'm relatively new to microcontroller programming, so please excuse me if my question is dumb. I've created a simple device that allows me to control 4 relays based on temperature. I bought four ...
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285 views

DS18B20 flaky with LOLIN32 ESP32 board, rock-solid with Uno

I'm trying to read 4 DS18B20 sensor probes (https://amazon.com/gp/product/B00Q9YBIJI and https://amazon.com/gp/product/B008HODWBU) with a "Wemos" LOLIN32 ESP-32 board (https://amazon.com/gp/product/...
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345 views

DS18S20 (Not DS18B20) reading FF FF

I found a batch of DS1820 in my drawers; they worked 10 years ago on a DS9097U-09 onewire to RS232 converter. Note, not DS18B20 I use them in parasite power mode; pin 1 and 3 together to gnd. But ...
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720 views

Temperature Sensor not giving proper values

In my current project I am reading temperature through sensor which is having only two wires. To read sensor values, I have used below schematic which I have found on Arduino Project Hub site. In my ...
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4answers
3k views

Wemos D1R2 - Onewire 2 DS18B20 passing to variable

I'm a beginer, did some tests with Uno and now have a Wemos D1R2 on my hands... I'm building a sort of weather station that will send data to thingspeak.com and log this data there. I managed to ...
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2answers
28 views

DS1820B only returns -127

ive used one DS1820B sensor in a AVR bread board circuit and it works there, now i tried attaching it to a arduino mega board with the code below and also another library below that. currently the ...