YourITronics

The goal was to design a home made LED Display that can be expanded to bigger sizes with minimal costs. Unlike other systems, on this one the image gets scanned mechanically and the image is created by using the POV effect (persistence of vision). There are 32 RGB LED used in the project but you can easily increase the number of LED’s. The author attached the system to a spinning fan, and the images started to appear.

ATmega16 RGB LED Display: [Download Project] - [View Project PDF] - [Via]

A frequency counter is one of the most important measuring tool you need as hobbyist of RF electronics. This frequency counter has very high performance and still is very easy to build and to use. The counter is based around 6 LED displays which will present the frequency with 1kHz resolution. The frequency will be presented on the LED display and at the same time also sent on the RS232 line.

2.5 GHz Frequency counter: [Link]

This project’s display is made of a number of tiles, about 2″ square with an 8 x 8 array of color LED pixels. Each tile is individually powered and animated, so your can freely pick them up and re-arrange them. To set up a display, the tiles are placed in a special tray. Animations are downloaded into the tray via Ethernet and stored locally on an EEPROM, or loaded via an SD card. The tray broadcasts the animation to each of the tiles, and then synchronizes them.

If the pieces are left in the tray, the animation can be updated continuously over the Ethernet connection. If the tiles are removed from the tray, they’ll display the animation for several hours with their own re-chargeable battery power. Once the animation is synchronized and running on the tiles, you can pick them up and place them anywhere.

Dynamic Tiled display: [Link] - [Via]

I finally got a new monitor on my desk, an Acer P223w. It looks great and I’m very happy with the performance, i mean its not top of its class but its worth the money i payed for it. I choose Acer after doing allot of research, of-course there were allot of other models and makes on the 22inch segment like Samsung that are slightly better but those were over my budget. Another reason i chose Acer for, its the Crystal Brite technology (CrystalBrite is Acer’s marketing name for high-gloss laptop screens, representing the latest in anti-reflective LCD screen technology). I own an Acer Aspire notebook, which has CrystalBrite display and it looks great, so i wanted the same technology on my desktop monitor.

Before i got the Acer P223w i was using a 17 inch CRT monitor(yeah i know, i should of got a new monitor some time ago) so you can imagine that i was truly impressed with the size and properties of the Acer. Here is a list with the main features of the Acer:

• Screen Size : 22″
• Resolution : 1680 x 1050
• Contrast Ratio : 2500
• Response Time : 5ms
• Connection : DVI, D-Sub

Acer actually build two versions of this monitor one with D-Sub(VGA) and one with DVI connector. I have the one with VGA, because at the store where i ordered the monitor they only had this version. But i don’t think the DVI version would of been any better, because most of the differences between DVI and VGA monitors are just numbers, nothing to be seen with your eyes.

The first thing i did when i powered it on, was to check for any dead pixels (i recommend you do this every time you buy an LCD display). The best way to check for dead pixels is to run a program called LCDtest (i attached a zip archive, so just click on the link to download it). What the program does is to display 5 colors on your screen(white, red, green, blue and black), this make spotting dead pixels really easy. So i ran the test and everything was ok, actually during the test i could see how nicely the monitor displays the black colour(very black).

My video card already detected it as a wide screen monitor and set the 1680 x 1050 resolution. Next thing to do was to find a nice High Definition wallpaper, i chose this nice mountain scenery. I’ve not seen bleeding issues like others report on various forums and sites, in fact i have no issue at all with the monitor. Even if it doesn’t have the 2 ms required response time for gaming, the monitor still displayed the games i tested without issues(Comand&Conquer latest versions, NFS Carbon).

Another great thing about the Acer P223W is the OSD menu, which is great. Other monitors have really complicated OSD menus, but not Acer. You can access 2 main OSD menus, the full menu by hitting the Menu button, or the E button (e comes from Empowering, another technology from Acer). So far i only use the empowering button, because i only change the display mode from Text to Movie sometimes, everything else the monitor adjusts automatically.

As a final word, the Acer P223W is a great monitor and definetely a must see on your shopping list. If you have a limited budget and you want to get great design and performance, this is a perfect choice.

Remember the Electronic Hits Counter i wrote about last week ? There’s a new version out, this time Bob made the counter USB capable, this means you connect it to your pc trough USB instead of RS232. The functionality is still the same, it shows your website hits, on a LED display which is cool. I’m gonna build one soon.

Electronic Hits Counter > USB version: [Link]