https://github.com/mrd0ll4r/dht-to-i2c-expander

A project that uses an ATmega8 to translate I2C to 16 DHT22 sensors.
https://github.com/mrd0ll4r/dht-to-i2c-expander

Last synced: 2 months ago
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A project that uses an ATmega8 to translate I2C to 16 DHT22 sensors.

• Host: GitHub
• URL: https://github.com/mrd0ll4r/dht-to-i2c-expander
• Owner: mrd0ll4r
• License: mit
• Created: 2021-07-24T08:43:22.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2022-12-24T13:25:02.000Z (about 2 years ago)
• Last Synced: 2024-04-14T22:51:12.127Z (8 months ago)
• Language: C
• Size: 29.3 KB
• Stars: 4
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# dht-to-i2c-expander

A project that uses an ATmega8 to translate I2C to 16 DHT22 sensors.

We have many DHT22 sensors and didn't want to/couldn't connect them all to a Raspberry Pi due to lack of pins and lack of a robust implementation (we bitbanged it from userspace, which was meh).

We therefore created a small breakout board with an ATmega8(L) on it to read the sensors and make readings available via I2C.

Readouts are triggered via I2C by the bus master through setting bit `0x01` in the status register at `0x00`.

Most of this stuff, including the resulting format and whatnot, is explained in `main.c`, so check that out.

## License

MIT, but would be nice if you would link back here.