The Morse Thermometer - Part 2
Reverse Engineering a Solar Lamp Part 1 of this post is a write-up of my project for a thermometer with Morse code output. But I was not satisfied with the relatively high power consumption of the circuit, so I decided to use a solar cell to supply the circuit. A cheap source of solar cells these days are solar garden lamps. You get them for very little money in garden centres and DIY shops.