D18B20 - what should i write into the "slave" field

[cay.kruse]

Hello,
what should i write into the “slave” field when i want to use a D18B20 Temperature Sensor.
Once it was detected automatically but later it doesn`t work well.
Kind regards
Cay

[Ian]

Hi Cay,

Welcome to the Cayenne community!

The short answer to your question is the DS18B20 address goes in the slave field.

or

Each 1-Wire slave device has a unique, unalterable, factory-programmed, 64-bit ID (identification number), which serves as device address on the 1-Wire bus.

The slave address for a DS18B20 looks like this 28-000006908c5f .

If Cayenne can’t ‘see’ the device you can use the below link to instructions to check to see if the RPi and 18B20 are working together.

DS18b20 not appearing in dashboard anymore

Might take a look at the RPi itself and see what it is getting from the sensor. cd /sys/bus/w1/devices/ ls cd 28-"put your serial here" ls cat w1_slave if you get something that looks like this, 25 01 4b 46 7f ff 0b 10 65 : crc=65 YES 25 01 4b 46 7f ff 0b 10 65 t=18312 the last number, 18312 in my case, is the temp in milli-Celsius. So in my case it is 18.312°C in my back yard. At least you will know if the sensor and RPi are working together. [image] My heartfelt thanks to pyromd76 over…

Good luck,

Ian

[cay.kruse]

Hi Ian,
thank you for your reply.
That was really helpfull.
kind regards
Cay

[Ian]

Very good to hear!

Thank you for your patience.

-Ian

[Ian]

@cay.kruse

Cay,

I’ve moved this to the ‘helped’ topic. Please let me know if this is not correct.

Ian