Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Say “I Love You” with Arduino

You are probably aware that Valentines Day is approaching. So put your serious projects aside and think a bit about your beloved. LED heart will work just great for this :). Take a look at this Arduino controlled Charlieplexed LED heart project might be this will be exactly what you need to do. It looks pretty simple, but there is some science in it. It uses 27 individually addressable LEDs and uses only 6 wires to control them. This is so called Charlieplexing wiring. When board is ready this is up to your imagination what to display. You can try out ready made software for this that is located here, or you can write your own and you don’t need to be tied to Arduino. Heart can be attached to… Continue reading

Large 25×25 LED sign board

Bright LEDs are cheap today. So many new projects with large amount of LEDs can be done. But there is one problem – large amount of LEDs consume large amount of energy. This is a project that implements special technique that allows driving efficiently hundreds of LEDs. This is a large PCB where 25×25 (625 total) LED grid is soldered. Resistors and transistors are positioned around the edges of message board. That entire grid is controlled by AVR Atmega164 microcontroller. Displaying technique works as follows: microcontroller scans all display row by row through multiplexer. Scanning speed is fast enough to see all non flickering images. Project is published as open hardware. PCB and AVR-GCC project files are free to download. But if you want it quicker – you can always… Continue reading