Adafruit monitors temp and humidity with Atmel MCU

low cost tiny components to make datalogging affordable!

Atmel | Bits & Pieces

Adafruit’s Mike Barela has designed a temperature and humidity monitor built around the Atmel-powered (ATtiny85) Trinket. As Barela notes, monitoring sensors are a very common feature in current-gen Internet of Things (IoT) projects.

“While the Trinket does not have a serial monitor built in, it [does] talk over various protocols including software serial, I2C (two wire) and SPI,” Barela explained. “This project can be placed in a very small enclosure and used anywhere environmental monitoring is needed. [Plus], the code and concepts may be used in a number of your own projects.”

Aside from the Atmel-powered Trinket, key components include:

  • RGB backlight negative/positive LCD 16×2 + extras
  • Standard LCD 16×2 + extras
  • i2c / SPI character LCD backpack
  • DHT22 temperature-humidity sensor + extras/DHT11 basic temperature-humidity sensor
  • Breadboarding wire bundle
  • Half-size breadboard

In terms of software libraries, Barela’s project uses TinyWireM (a Trinket-compatible alternative to the Arduino Wire),

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