Simple AVR USB Temperature Probe

This simple USB temperature probe uses the AVR USB library by Objective Development. The included ruby script reads the temperature and optionally logs it using RRDTool. The EasyLogger would send the data values over a keyboard interface. The project uses a custom device class and reads values using the ruby-usb library. The project primarily intended to be used in Linux, although it is possible to get it to work in XP with a bit of hassle involved.

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USB Temperature Probe Documentation

AVR Electronic Combination Lock

CodeLock AVR is electronic combination lock based on AVR microcontroller AT90S2313 or ATtiny2313. User code is consisted of 1 to 8 digits. If the code is entered in the correct sequence, then after 1 second the relay and the electric striker (in the door) switch on for 1 second and then switch off again. User code can be changed via 3x4 matrix keypad. Program in hex code is 2 kB long.

tag : electronic lock, combination keylock, Avr project src

AVR Electronic Lock with Key Generic RFID

This is a generic 125KHz RFID tag reader and an electronic contactless lock. The project is based upon microcontroller AVR ATtiny2313 and generic 125KHz RFID. Here is the project work: the code of first tag that is read after chip programming, is stored in the micro Earom (non volatile) and it works as the "key". Every time that tag is read by the circuit, the relay pulses for about 1.5 seconds, a led lights for 3 seconds and the code is sent out on the serial port. Every other tag doesn't pulse the relay, but lights the led and sends its code on the serial port. So, this circuit will be a generic reader or an electronic lock with RFID key. This project designed by Emilio Ficara.

tag : RFID lock, electronic contactless key, AVR project (src)