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

Word clock gets even better

Following clock was originally inspired by QlockTwo. It is just in non English (Bosnian) language. But as always – if replicate something be sure to add new features. And here they are. First of all author wanted to display every minute instead phrases like “half past two”. So this requirement led to using 248 LEDs. Another nice feature is capacitive inputs instead of regular buttons. This makes it look more pro. Word clock is based on Atmega328P microcontroller. Time keeping is left for DS3231 real time clock (RTC) from Maxim. In order to control 248 LEDs there are 4 MAX7219 daisy-chained drivers. To make capacitive inputs there are couple couple AT42QT1011 capacitive touch sensors used. They work fine through vinyl glass. Word clock displays not only the time but also date, temperature, seconds. It has automatic brightness adjustment and other minor settings. Continue reading

Word clock using LED blocks

Word clock is an interesting and unique way of displaying time. Instead of showing digits it highlights current time using words. All you have to do is to read words down in order to tell time. Ishan karve designed a word clock using 16×8 LED panel covered with letter mask. He used couple of MAX7219 LED display drivers – each capable to control 64LEDs. And split display panel in to 4×4 modules for easier development and eassembly. The other part includes control and time keeping. Atmega168 takes care of reading time values from DS1307 RTC and also sends time update signals to LED panel. Since MAX7219 are controlled using SPI interface it doesn’t take much of load. Clock project is still in development so keep an eye on updates. Continue reading

Turn photo frame in to word clock

This is really easy to build project which uses couple external components, Arduino and an old photo frame. All you need is to store 720 pictures with actual time words – for each minute in 12- hour cycle and then let the circuit to hit next button every minute. First of all in order to hit next button you don’t have to build some kind of mechanical actuator – simple optocoupler will work fine. And probably the hardest thing is to think of generating 720 images with different words on it. No problem with that – a processing script can do this for you – just select right parameters and run script. After images are generated – upload to photo frame memory and start a clock. Someone wants to change frames every second – that’s only a 43200 frames to generate 🙂 Continue reading