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Resume and bio of the author Couple of articles related to my hobby - robotics
My impressions about immigration to Australia. In Russian only. Recipes for everyday problems solving
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Andrey Mikhalchuk’s Blog

Technoblog about life

Jun 23, 2011 Controlling RGB LED using PICAXE-08: Basics of software PWM

Driving RGB LED with PICAXE-08M

Driving RGB LED with PICAXE-08M

I’m working on a new RTFMs episode that involves packing an RGB LED and a microcontroller into a very tight space. The microcontroller I decided to use is PICAXE-08. I chose it for three reasons:
- I had one in the box
- I had no other plans for it as it appeared to be not very suitable for what I got it for (a high-altitude balloon project)
- Using it to dim RGB LED is a challenge
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Jun 20, 2011 Reading ATtiny85/45/25 Internal Temperature Sensor

ATtiny85 has internal temperature sensor

ATtiny85 has internal temperature sensor

I am working on one of my projects from RTFMs video blog (check out http://rtfms.com) that requires temperature sensing in a very small packaging. Naturally my choice is ATtiny85 – an awesome little chip from AVR that besides other goods (like 6ch PWM, serial interface etc) has internal temperature sensor. So I decided to use one. That wasn’t easy, but after a few hours of digging forums and datasheets I came up with a class that does the job with quite impressive reliability and precision.
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Jun 17, 2011 Juliana and Doyle Brothers Totally Rock!

Jun 3, 2011 Choosing best high-end HT (amateur radio handheld transceiver)

Here is some information for those looking for a high-end HT. My requirements are:

  • At least dual-band (tri,quad-band is a plus), including 144 and 440 bands at minimum
  • Good wideband receiver
  • All-mode receiver
  • Convenient control
  • Weather proof
  • Ruggedly built
  • Having a lot of features, leaving a lot of space for experimentation
  • Major brand
  • Price should be “reasonable”. It’s clear that an HT with the features listed above won’t be inexpensive, but I want to avoid paying extra for features that I don’t need or paying for something I can get cheaper in a different radio.

These are very expensive requirements and only a few HTs fit them. There are three major companies that produce something that fits most of the requirements: Icom, Kenwood and Yaesu with the following models:

Icom Kenwood Yaesu
Icom IC-91A

Icom IC-91A, from $320, dualbander, upgradable to D-STAR

Icom IC-92AD

Icom IC-92AD, from $540, dualbander, suports D-STAR

Kenwood TH-F6A

Kenwood TH-F6A, from $304, legendary radio, excellent scanner, tribander, superwide receiver (0.1MHz-1.3GHz), 5W on all three bands

Kenwood TH-D72A

Kenwood TH-D72A, from $485, dualbander, has GPS and APRS support

Yaesu VX-7R

Yaesu VX-7R, from $320, quadbander, waterproof

Yaesu VX-8DR

Yaesu VX-8DR, from $410, quadbander (with limitations on 220 and 50), advanced APRS support, GPS and Bluetooth upgradeability, WIRES, tree receivers, stereo WFM

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