ESP32 with battery - DS18B20 Sensor

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1

Hi,

Currently logging temperature at home with rpi 4 with DS18B20. However i want to use arduino with this project.

My aim is to use Arduino, ESP32, DS18B20, INFLUXDB & WIFI

  • I want to log temperature to a influxdb database
  • However i need a battery to support the esp32 when the device is out of power supply. (with support on esp32 usb)
  • So I have freezer inside my van, where i want log the temperature of the freezer
  • When i park the van at work, i plug freezer unit to power.
  • At work i have wifi, when there is wifi i want temperature logs sent to a influx database.
  • when there is no power, i will want eps32 power from the battery. (it can shut down after 4 hrs running on the battery)
  • where there is no wifi connection, i want want eps32 store the logs until theres a wifi connection, and send the logs to influx database with the right timestaps

Wondering what will be the viable right esp32 board and battery? (i already have the DS18B20)

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2

Please be careful about the temperature sensor’s wiring and placement within the freezer. So that it doesn’t affect the accuracy of the readings or get damaged due to temperature extremes.

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Hi @Huseyin262816 - welcome to the forums :smiley:

There are a few ESP32 offerings out there that have integrated battery charging:

does that help?

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4

thanks i have already wired the DS18B20 sensor from the external of the freezer.
i was planning to put the esp32 in a small junction box, near the power socker of the freezer

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5

thanks mate.
I will go with ProS3.

  • Will this battery be fine Polymer Lithium Ion Battery (LiPo) 3.7V 1100mAh ?
  • Like i would like run on the battery max 4 hours with deep sleep, where it needs check if theres a wifi connection available every hour. if the power supply goes off, the battery will be activated right away ?
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6

Yes to both counts, the battery is you’ve selected is in the recommended essentials list for that product.

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The battery will back up the circuit so if USB power is removed the battery will be used to power the project without interruption.

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great lastly what will be the ideal power usb via usb power adapter connected to wall outlet

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8

can’t beat a raspberry pi one
it’s way over-specced for this project but they’re so handy to have as a maker

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