Nano 0.66" OLED Weather Station. ATtiny85 and BMP280 on a Compact PCB.

Smallest weather station. Only 13x15x5mm!

Four lines of text show temperature, pressure, and estimated altitude in meters above sea level.

Very low current consumption, only 3mA on lithium coin cell. Works down to 1.6V so can be easily operated with small solar panel.

See github for files and details.

ATtiny85 soic8

BMP280 8-pin LGA

SSD1306 0.66"

6x 10K resistors

560K resistor

Capacitors: 2x1uF, 2x4.7uF, 2.2uF, 3x100nF

PCB files for jlcpcb is provided on github page.

Solder everything together yourself or order the PCB from jlcpcb.

If you are not using my PCB and are using an SSD1306 with a breakout board, I recommend removing the voltage regulator or shorting its IN–OUT pins. But not mandatory.

Compile arduino files found on github or burn already compiled HEX file with some programmer device.

Fuses: Low: 0x62, High: 0xDF.