Compact speedometer with OLED display and temperature measurement.
It features an ATtiny85 uC with USB programming and battery charging and protection circuitry. I will be using it to measure the speed of my bicycle and determine the temperature around me on my rides.
The project consists of 2 pcbs: the sensor that will be mounted on the wheel of my bike and the actual speedometer.
**Szpak** *(a.k.a. SPAQS)* is a solar powered air quality sensor with LoRaWAN connectivity. Project uses enclosure and accessories from [Nettigo Air Monitor 0.3](https://easyeda.com/nettigo/Nettigo-Air-Monitor-0.3) ([More info about NAM](https://air.nettigo.pl/baza-wiedzy/?setlang=en)).
Szpak uses Heltec CubeCell HTCC-AB01 development board with ARM Cortex M0+ CPU with embedded LoRaWAN radio. Boa...
A hat for the Raspberry Pi Zero which has several sensors.
Among them a connection to the SDS011 dust sensor.
*** v1+v2 have problems with the dust sensor power supply ***
*** v3 has a problem with the temperature sensor ***
*** v4 is working fine ***
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