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

Cheap LED matrix display uses MAX7219

LED matrix displays are often used where bright text of simple graphical messages need to be dynamically displayed. You can get 8×8 LED matrix blocs really cheap in Chinese shops. Bajdi found that ones that are interfaced with MAX7219 – serially interface 8 digit LED display driver work really well even if they are non genuine MAXIM chips. He bought 8 of those display bricks and connected them in to long 8 x 64 display. Then he used Arduino to drive them. It only needs three wires for serial interface. H also used Parola Arduino library on Codeplex to make scrolling text effects. In order to make display longer, he built several additional PCBs by modifying a bit original files found on Parola website. Since messages are running, next step is to add some interactivity with Bluetooth and Android app. Continue reading

Portable Bluetooth enabled LED matrix display

Large LED displays can be used for many purposes. They can serve as signs, indicators, message displays. What about portable display? This idea gives even more uses. R-B in embedded-lab have published his Buletooth-enabled LED matrix display which is built of 8×64 LEDs. It is capable of displaying static messages, scrolling text. All settings can be sent via Bluetooth from your smart phone or other device where bluetooth is present. Display control is based on Arduino which interfaces HC-06 Slave bluetooth transceiver module. Display is built of eight 8×8 monochromatic LED modules that are daisy chained in to large display. Each module comes with MAX7219 driver chip. Software heavily depends on various libraries that enable controlling behavior of messages, scrolling them, adjusting brightness and so on. To make it portable he powered display with rechargeable 9V battery pack and regulated voltage to 5V with standard LM7805 voltage regulator. Continue reading

It’s Time to Have a Brand New Change!

You’ve already bored with the old-fashioned clock, but you think it’s unnecessary to spend the money buying a new digital clock, especially in this economic turbulence period? Well, if you’re really want to own a digital clock, then why don’t you spare a few hours and develop a sophisticated time display unit? Unlike the other time display, this one is slightly different, as it has a PIC18F1320 microcontroller for experimentation and installed with a cheap GPS module! Below here are some of the unique features of this time display: UTC time configurable (It’s for differencing time zones with DST option). Super low power consumption. Two difference time display modes (12 or 24 hour). A leading zero blanking option. AM/PM indication (Only available in 12 hour mode). GGA and RMC sentence status indication. For your information, this project requires the use of on-chip 8 Mhz oscillator, which is driving a six digit LED display. If you prefer a brighter and better display, you would like to consider applying a MAX6951 chip into the project. By the way, the MAX7219 display driver… Continue reading