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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