I have a SIM800L based data logging unit. This is part of a LilyGo T-Call 1.4 unit with an ESP32 controller. I wanted to find the location of the device using the GSM network and this post gives information relating to my attempts at doing this. Spoiler alert – you cannot easily get longitude and … more
I wanted to produce a small display for simple items of data streamed/taken from the internet. My initial plan was to look at environmental monitoring, but this was Feb 2020 and covid-19 hit the UK about this time. I saw that the UK government were making the cases data publicly available & so I set … more
This post covers making an E-Paper display to show me the daily weather forecast. Obviously I can just use my phone to do this, but I wanted a free standing, battery powered display to show me this info quickly and easily. E-Paper is perfect as I can just get this info every few hours and … more
I picked up a really nice and low priced E-Paper display, called the TTGO E-Paper Series. Mine is the T5 V2.3, which uses a 2.13″ E-Paper display, has an SD card slot, a bit of flash memory, one I/O button and some clever power management ICs. It uses the ESP-32 WiFi System on a Chip … more