Electronic candle on AVR

This story begins on the eve of the last new year. Sister asked me to make a fairylight for their New Year costume of firefly. Light should look fabulous and unusual. At the attic long was lying an old lamp which had been fitted with paraffin candle. Variant with a real candle was rejected immediately because of its flammability and in head immediately appeared idea to show engineering ingenuity.

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Simple step-up DC – DC converter on a single transistor

Simple step-up DC – DC converter on a single transistor

This converter works almost with any elements. I assembled with his pile of rubbish over, literally 5-10 minutes. Although current output goes low (about 30mA), but with a small strapping power will be enough for LED or microcontroller .

Its main advantage is that it works from 1.2V battery. But be careful if you give it more than 3.0V, then the circuit may fail.

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CNC machine carves piece of PVC

And now it is a significant day, CNC machine comrade. Beehiwe involved in the whirlpool a busy amateur life.

First thing for testof  CNC was building coil for homemade model metal detector Quasar. Construction of metal detector can be found on the author’s website

http://fandy.hut2.ru/Quasar/Quasar.html

The material for the body coil was chosen foamed sheet pvc plastik 3mm thickness. Easy material pliant white which  sold in stores that sell materials for advertising makers, simply cuted with paper knife and glued . Since it was glued in a sandwich  thickness 9mm machine had to mill body of coil.

And now photos))))

 

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Cheap radio channel for AVR

Good day. I recently wondered to organize radio communications between microcontrollers AVR. The budget was very limited, and therefore as a controller for the test i selected two Atmega8 which have  long idle lying . When i start search of experimental transceiver I was unpleasantly surprised by the prices of  radio modules, so on that money that I expected in Ukraine could only buy a “pair receiver – transmitter board” at 433 MHz  . But I wanted a full duplex link so I started looking in an Internet suitable option. It was a 2.4 GHz radio module. NRF24L01 drew the attention certainly of its price.

In the basic version without amplifier and the antenna on the printed circuit board. At the time of this writing a article couple of these modules on ebay can be bought for $ 3.23

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