Tag Archives: I2C

Portable Fine Dust Meter on Batteries

Posted on 16 March 2026 by Willem Aandewiel

96 keer bekeken / views This project was sponsored by In an earlier post I described the development of an aerosol sensor that measures how much fine dust is present in the air and sends these values to an MQTT … Continue reading →

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Posted in 3D printing, Arduino, Computer, ESP32, Firmware, Hardware, KiCAD, PCBWay, WiFi | Tagged , , , , , , , , | Leave a comment

Extending GPIO pins on your Micro Processor

Posted on 10 August 2020 by Willem Aandewiel

[ ]Somehow, no matter what micro processor I choose, I end up with too few GPIO pins for the projects needs or for what I want to do. For a recent project I switched from the ESP8266 to the ESP32 … Continue reading →

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Posted in Arduino, ESP8266, Hardware, KiCAD | Tagged , , , , , , | Leave a comment

Controlling Lots of Relays with only 2 GPIO pins

Posted on 1 May 2020 by Willem Aandewiel

Piggyback board for 8- or 16-relays boards to control with I2C Continue reading →

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Posted in Arduino, Computer, ESP8266, Hardware, WiFi | Tagged , , , , , , | 1 Comment

I2C Rotary Encoder

Posted on 3 October 2019 by Willem Aandewiel

14,908 keer bekeken / views I will address two topics in this post. The first one is about Rotary Encoders and what you can do with them. The second is about the Inter-Integrated Circuit protocol (I²C), developed by Philips. Een … Continue reading →

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Posted in Arduino, Computer, ESP8266, Hardware, KiCAD | Tagged , , | 10 Comments

BeeHave – a beehive data logger

Posted on 3 May 2017 by Willem Aandewiel

[ ] A friend of my keeps bees as a hobby. I’m not fond of flying, stinging insects, but because he was so enthusiastic my partner and I went to visit an apiary in the ‘Corversbos’ in Hilversum and it … Continue reading →

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Posted in Arduino, Computer, ESP8266, Firmware, Hardware, Van Alles, WiFi | Tagged , , , , , , , , , , , , , , , | 4 Comments