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DS18B20 temperature sensor |
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Excellent for battery operated unit. Requires only 1 data line. Downside, 3v operation rules out powering the system from 2x 1.5v batteries as operation stops below 3v. |
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SHT40 Temperature and Humidity |
| Best option for battery powered unit. Runs as low as 1 volt. Super low current. |
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BMP280 Temperature and Air pressure |
| Good option for battery powered unit. Runs as low as 1.7 volts. |
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BME280 Temperature, Humidity and Air pressure |
| Good option for battery powered unit. Runs as low as.7 1 volts. Typically only one of these units is needed as 1 air pressure sensor is enough to read outside barometrics (even if installed indoors) |
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Battery Sensor |
| A surprisingly accurate battery sensor requiring a couple of MCU pins to give battery status. |
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