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

QR clock now with graphical LCD

QR code is capable to carry decent amount of information so it is suitable for encoding things like time. When you look at video it seems that it is some sort of alien clock ticking (the one you saw in “Predator” movie). All you can distinct here is a tick every second. If you need to tell a time you need to take a picture and decode QR message. Clock was build by Markus with original idea taken from LED matrix based QR clock. Clock runs on PIC32 microcontroller which decodes time signal from DCF77 receiver, then calculates QR code and displays on ST7735R graphical LCD at 30FPS. It has a nice feature programmed in. When clock is unable to read radio signal it displays time in greyscale and it gets colorful with plasma effect once it locks to DCF77 signal. I would probably add a digital time as well to the screen since QR clock is quite useless unless you are really well trained to read them on the fly 🙂 Continue reading

Digital QR code clock

You thought that binary clocks are hard to read? Try to tell time by looking at QR clock. Ch00f decided that QR codes are no so useful as they are pushed everywhere. First thing is that it is practically non readable by human. At least now until everyone gets smart lenses or glasses to translate them on the fly. Of course you can use smart phone to read those, but this require additional actions like opening app taking picture and converting only to see whats written. QR code needs at least 21×21 pixel square, so there are nine 8×8 LED matrices used. Clock is driven by Atmega328 microcontroller which runs clock in firmware. Another issues ch00f faced were QR codes. There were two ways of having QR code for each minute of the day (total 1440). store each of them would take more memory than AVR can provide. So second option left – generate them dynamically. Also he added a photo transistor to monitor ambient light and dim LEDs so it distracted less. Clock displays time only but QR code… Continue reading