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Grid Frequency Monitor with E-Paper Display

Posted by Matthew Little on

I've been wanting to build a grid frequency monitor for a while now. The national electricity grid frequency is a good indicator of the state of the supply and demand within the grid. If the frequency is high then there is more supply than demand (so it's OK to switch on some loads), if the frequency is low then there... Read more

Solar E-Paper Display

Posted by Matthew Little on

I wanted to make an E-Paper display that would run continuously without the hassle of recharging, so wanted to power it with a small solar panel. I had both my E-Ink display kit and my solar charger kit, so I decided to put them together to create a solar powered E-Ink display. This worked great and, with a few display updates every day, will... Read more

Prototyping a Wildlife Camera

Posted by Matthew Little on

Updated 3/7/2025 with new firmware. This blog post covers the main design choices and prototyping stages from developing a wildlife camera unit. I had seen the ESP32-CAM, which is based on the ESP32 microcontroller with wifi module. It's incredibly low cost and does some amazing things (including face recognition) with the example code other people have written. I got hold of... Read more