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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.
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
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.