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16 Feb 2008


Video switcher allows monitoring up to 4 security video cameras. Interesting thing is that device uses intelligent method of motion detection. PIC grabs low resolution (8×8) video frames and then calculates numeric sums of screen regions to detect motion by detecting image changes.

Of course it may seem that PIC microcontrollers are too slow for taking frame or even single video line at once. So it reads one sample per video line while line skewing has no practical difference. This way it collects all 64 data points. The Source File only implements the 4 cameras. You can connect any number from 1 to 4 and the software will sort out the detection and switching. Motion on any video input switches the output immediately to that source. [via]

Video camera switcher with motion detection – [Link]

16 Feb 2008


Working with SMTs (surface mount technology components) is quite difficult without an smt hot air pencil. The prices of smt stations are too high, so I decided to build it by my own. The result is very impressive. Anyone with basics electronics can try to build it, it’s made with common materials. [via]

Home made SMT Desoldering Station – [Link]

15 Feb 2008


This article is about a Tetris game I created with an AtMega32 controlling the beam of an oscilloscope, which I very creatively named Scopetris. [via]

Scopetris – [Link]

15 Feb 2008



These LED people blink in each other’s arms. Project schematic included. [via]

Valentine LED people – [Link]

15 Feb 2008


Latest Gadget Freak from Design News, a special Vday one! –

Looking for cool way of wowing that special someone on Valentines Day/birthday/whatever? Build her a flashing heart made from LEDs driven by a programmable microcontroller. Les’ gadget is simple to build and made from easily-obtainable parts. The unique thing about this design is the LEDs are in an X-Y matrix so each LED is addressable. This allows an unlimited combination of displayed patterns for the heart — not like some other designs out there! Source code and schematics are all available here and if you’re not into hand wiring, even the PCB can be had for a small fee. Diamonds may be a girl’s best friend but gadgets are forever. [via]

HOW TO – Build a flashing heart – [Link]

15 Feb 2008


The EXAscan is a handheld 3D laser scanner small enough to fit in a carry-on size suitcase. It uses 3 high resolution cameras in conjunction with a self-positioning target system alleviating any need for external tracking devices during scanning. And on top of all that it looks like special issue starfleet equipment. (and most likely costs about as much.) [via]

Handheld 3D scanner – [Link]

15 Feb 2008


This is a NiCd/Ni-MH charger that can charge with constant current and automatic charge termination when the total voltage for all cells reach the setting voltage.

Ni-cd charger – [Link]

15 Feb 2008


This is a Li-Po charger and balancer project for R/C hobby.The charger circuit is based on the circuit of Electron head and all folks in the DIY electronics topic on the rcgroups.com. [via]

Li-Po charger and balancer – [Link]

15 Feb 2008


This is a Data Acquisition & Logging System Using AT89c51.It is actually a temperature logging System. Here 8 temperature sensors are connected(4 shown in diagram for simplicity). values of all the sensors are sent serially by AT89C51 to pc. Software “DAQ System ” takes these values and show them on its front panel, and also logs them to the data base “daq.mdb” .we can set some parameters like set point , low limit ,and high limit . when temperature of some sensor increases beyond set point ,the heater connected to controller (specific for that sensor) will be turned OFF( ON in opposite case ).High limit and low limits are for alarm. when temperature goes above high limit or below low limit the alarm will be turned on.

Data Acquisition & Logging System Using AT89c51 – [Link]

14 Feb 2008


xor writes:

I now have Touchscreen GLCD’s available on http://circuit-ed.com that are compatible with the mE boards. I connected the 4-wire touchscreen tab to the EasyPIC board by soldering 4 wires of the IDC10 Flat Cable to the touchscreen tab and connecting it directly to the EasyPIC’s PORTA pin connector. On the website is a complete datasheet of the touchscreen and GLCD.

TOUCHSCREEN GLCD Drawing Program – [Link]





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