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Miroslav Hancar

Published: Oct 29,2024

Ultra Low Power thermometer

With a current consumption of only a few microamperes, this thermometer can operate for years on a single CR2032 battery—or indefinitely with a solar cell.

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Hardware Components

  • MCP9700-E/TO

    X 1

Tools, APP Software Used etc.

  • Eaglecad

Story

  • Ultra-low-power thermometer with an average current consumption of approximately 3 µA
  • Components: PIC16LF19175, MCP9700A, and MCP1501 (-10 or -20)
  • Measurement frequency: 1 measurement per second
  • Temperature range: -40 to 52°C (using a 1.024V reference) or -40 to 125°C (using a 2.048V reference)
  • Power options: CR2032 battery or an experimental "solar 2032" setup (10 BPW34 photodiodes connected in series without a DC-DC converter)
  • The MCU remains in sleep mode for most of the time



Code
  • MPLAB X project

    lowtemp32.X_1099908894671ff08447264.zip
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Miroslav Hancar

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