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Technical articles

11 Nov 2012

Here are some photos from disassembling Panasonic TZ7 camera (also known as Panasonic ZS3).
Panasonic made good work and everything is pretty easy. No hidden screws or things like that. You do no need any special tools, just standard Philips screwdriver.

The camera was accidentally immersed in salt water (Mediterranean Sea). Unfortunately event after cleaning it was not possible to make it work. In such cases it’s good to put camera immediately into fresh water.

11 Aug 2009
PWM wave


This guide describes principles of PWM for Atmel AVR micro controllers. It is not complete documentation for PWM nor AVR timers but tries to lighten some practical aspects of PWM. Some of the PWM aspects are simplified, some are not mentioned at all. Usability was the main factor when writing this text. Full PWM description can be found in Atmel AVR documentation.

Although the article was written based on ATmega16 and ATmega32 documentation, information is useful for any chip from AVR family.

12 Mar 2009

RS485 is an alternatve for RS232 for long distances. Maximum length of the cable for RS232 is only 15m. For RS485 it is about 1200m. In addition you can connect many devices to RS485 bus (unlike RS232 — only 2).

01 Dec 2006

The main problem in thruster design is how to isolate engine from water. There are three solutions used to keep engines away from water:

  • O-ring
  • Rotary shaft seal
  • Magnetic coupling

The best and more complicated is solution 3. The engine is perfectly isolated from water because it is connected to the propeller using magnetic coupler.
Solutions 2 and 3 are similar. In addition it is recommended to fill the engine housing with the oil to compensate pressure.

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