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

Building complete webserver with Arduino, SD card and ENC28J60

Luca has been working with ENC28J60 shield. He was able to send big files including images and html pages. So no he pushed things further and built a webserver with Arduino, SD card and ENC28J60. He connected SD card module and ENC28J60 to Arduino via SPI interface. He wrote sketch that handles static data that are fetched from SD card and dynamic resources like AJAX that are handled by sketch. Files in SD card are stored by using tinyFAT library that require less RAM to work. Static resources are sent from webserver with GET method. Different approach is with dynamic content. It is rendered within Arduino sketch. In his example AJAX call is triggered every 30 seconds to update uptime on webpage. All resources are open and accessible on GitHub. Continue reading

The Amazing DIY Laser Harp

There are over hundred, maybe thousand types of music instruments in this world. Amongst the music instruments, which one you love it the most? Honestly, most people will properly say, “Guitar, piano, violin, biola and blah, blah, blah…” Well, does anyone here ever know about the Harp? Harp is a stringed instrument and it has the plane of its strings positioned perpendicular to the soundboard. According to the ancient history, harps had been invented in many parts of the world in remote prehistory! Believe it or not, the oldest harps has been discovered in Egypt, which its dated 4000 B.C. Well, if you’re have the interest to build your own harp, why don’t you consider to create a “Laser harp”? It might sounds a little bit crazy, but you should try it on! For building this laser harp, you must use an Arduino board to build the DAC system. By the way, the DAC system is the short acronym of “Digital to analogue Converter”, which is generates the signal that moves the mirror of the laser harp. Beside that, you… Continue reading