I installed video surveillance system at my work place. Nothing special 6 color CCTV cameras, one computer with few hundreds of gigs storing about a month of h.264 video. But I had a problem with one camera. The distance from camera to computer is not very big, about 300 meters (~900 feet). But the problem […]
At work, sometimes, we need to print some papers in color. So we need some cheap color printing solution. First we used old HP 970cxi printer, but now we need to print more. Original cartridges are very expensive, so we used refilled ones. It is very easy to fill color cartridge, just add some ink […]
Original post dated September 28th, 2007.
After about ten years of waiting, most popular online payment system is working in Lithuania. Few years ago we used Western Union online payment system, but it was closed. Meanwhile Paypal was afraid of Lithuanian hackers or our bank system. Now, from 28th of September, the system is working. You […]
A bit offtopic, not very electronic post. Our tap water is full of lime (calcium). And this lime tens to grow on small tap filters, aerators. After some time I noticed, that the water stream is not very even, the bubbles are not so dense and small. After some more time the stream is skewed. […]
It is time to use USB. After several unsuccessful experiments I found some working project in the internet. Maybe other project are working too, but only this one was usable and understandable for me. As I need not only binary compatibility, but compatibility in the source code level. I want to recompile all stuff by […]
There are lots of chips with serial control. Some of them use Philips I2C buss. There two data lines and two power lines to transmit all data. There DTMF encoders, switches, Dolby surround audio processors, multiplexers and many many other devices. Just open any TV set and you can find some- like TV tuner. ATMEL […]
There is ADC in ATMEGA16 with 8 multiplexed inputs. This analog to digital converter have several interesting options. Here is abstract from datasheet:
• 10-bit Resolution
• 0.5 LSB Integral Non-linearity
• ±2 LSB Absolute Accuracy
• 13 - 260 μs Conversion Time
• Up to 15 kSPS at Maximum Resolution
• 8 Multiplexed Single Ended Input Channels
• 7 Differential Input […]
Blinking LED is not very cool. And not very informative. But we can use LCD module. It is very cheap and available device. There are many types of LCD modules in the world. I am using most popular- HD44780 controller based alphanumerical module. It is 2 lines, 16 symbols. There are 14 or 16 pins […]
Now we need to test PCB and MCU. To test this hardware we need to run some program. And to build program we need tools. I downloaded and used free software from internet. WinAVR package: http://winavr.sourceforge.net/. Also, I am using programmers notepad2. It is useful tool for MCU programmer.
First program is simple LED flasher. We […]
In older posts I mentioned, that I resoldered several ATMEL ATMEGA16 processors. So, I decided to build something usefull using this MCU. As this controller has more ROM and RAM, I decided to use only high level programming language- C. All software in these web pages are compiled and tested on my hardware. So, if […]
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