All posts in the 'General electronic projects' Category

Tweeting Cat door

Posted on 22 Apr 2009

Tweeting Cat door
Each cat has a small RFID tag on the collar. When a cat is in the close proximity of the door, a small RFID reader reads the tag and if the cat is authorized, a servo will unlock the cat door. The RFID reader and the servo controller are connected to an old laptop. The software on the laptop is written in Delphi and for each “cat door event” is sending a Twitter message and a picture to the Twitter.[more]

Posted in : General electronic projects | RFID projects

External keyboard with an iPhone

Posted on 29 Mar 2009

External keyboard with an iPhone
The folks at perceptive development have developed a custom interface that connects through the headphone jack. They had already developed the serial modem, so this was just another step at connecting peripherals. With some smart and small packaging, this could be a nice attachment to keep around.[more]

Posted in : General electronic projects | Telephone related projects

chamber fan

Posted on 04 Nov 2008

chamber fan
The chamber fan is a powerful modification that increases muzzle velocity, helps improve reliability and provides convenience during operation. The function of the chamber fan is to mix the fuel with the air inside the chamber to create a consistent explosive environment. The fan is also used to quickly ventilate the chamber with fresh air after the shot is complete.[more]

Posted in : General electronic projects

Photoplotter

Posted on 10 Oct 2008

Photoplotter
A photoplotter is a printing device that exposes light to a photo sensitive film to produce output.ย� The film is then developed like traditional photos to get the result.ย� There are 2 types of photoplotter, vector type and raster type.ย� Vector plotters move the exposure light anywhere in 2D space to create the image.ย� Need a line from point A to B?ย� No problem, just move from A to B.ย� These are similar to old style pen plotters.ย� Raster plotters, are more like a dot matrix printer, sending out one line of dots, then moving to the next to create an image.[more]


Posted in : General electronic projects

Alinco DX-70 to SGC Tuner Interface

Posted on 18 Sep 2008

Alinco DX-70 to SGC Tuner Interface
If you are using DX-70 and the SGC-239 tuner you will found a this problem-the DX-70 and the SGC-239 tuner were never designed to work together. Alinco did provide an Accessory port on the back of the radio as well as a tune button on the front panel, however some interaction with the tuner (or this interface box) is necessary for anything productive to happen. In a nutshell, this interface box’s purpose in life is to wait for the tune button to be pressed, start the transmitter, and wait for the SGC tuner to finish it’s job. It is a simple circuit for a simple task.[more]

Posted in : General electronic projects

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