These light up paper circuit cards were much easier to make than I expected and only need a few inexpensive materials.
A blast from the Elektor archives: this 1998 battery tester uses a simple LED display to reveal a battery’s true condition under load — even below 1 V.
This expandable LED display for a microcontroller in Figure 1 has a simple interface with only 6 data/control wires and can be easily accommodated to a DIY design. The display has static indication.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback