First DS18B20 after power up spike

On a solar power battery project we are powering up a Pi0w by applying DC every 50 minutes from a micro and letting the Pi0w kindly shut down every 10 minutes later using sudo shutdown -h now in a cron job.

We find that the First DS18B20 temperature reading is often reported on Cayenne dashboard as a junk high 85 degree C spike. All readings after that are fine.

Any ideas please ?

~ Andrew

this is an hardware device issue and there are a couple of post on it https://www.google.com/search?q=ds18b20+85+degrees+site:www.raspberrypi.org&sxsrf=ALeKk0342IG6YtUsfr3BQCm7Ve5_tg9Bnw:1606332369038&sa=X&ved=2ahUKEwjIo_2xtp7tAhX8xjgGHaCDBxkQrQIoBHoECAQQBQ&biw=1440&bih=821