Stand alone AVR butterfly datalogger

Nick Lott have been working on datalogger based in AVR butterfly kit. Data-logger is used to monitor environment parameters like temperature, light, voltage, and values from other sensors connected to other inputs: ADC, timer counter. Author wanted to make this project more universal that it could be used in variety projects like weather station, motion-recording with accelerometers, etc.   Datalogger can be configured wia RS232 interface with specially developed queries. With RS232 and joystick you can adjust various logging parameters like logging time intervals and so on. Data is logged to flash memory which contents may be viewed later for instance as graphics. Good ting that project software is open source what allows you to use and change code for you needs.

Automated self recording witness camera

This automated witness camera was built by Alberto Ricci Bitti and have won the Grand Price at Atmel’s AVR 2006 Design Contest. The goal was to build inexpensive easy of use automatic camera which may fit bay the door taking snapshots of persons entering, or using inside vehicle. There are meny areas it can be used.   Design is based on Atmega32 Atmel AVR microcontroller where serial JPEG camera is attached. Movement detection is done by PIR sensor and all information is recorded to SD memory card by using standard file system(FAT16 or FAT32). So all pictures can be easily transferred to PC with no special software. Pictures are taken at 640×480 pixels resolution at every 3.5 – 4 seconds. You can select several recording modes including: PIR activated, timer, … Continue reading

Radio spectrum FFT on Atmega8

This experimental project developed by ChaN. He managed to analyze Radiosignal spectrum and calculate its FFT which is displayed on graphical LCD. When analysing RF frequencies there are some problems with speed. Even when analysing 1MHz radio signal there is over 4000 samples needed for correct ADC.   To solve this problem he managed to shift carrier frequency to lover by using generic method: Frequency conversion, which operates with signals as complex, where operations with negative frequencies are available. So if signal is 100MHz with span ±1MHz, then frequency is shifted to 0MHz±1MHz. This way by Nyquist they there is enough to sample signal at 2MHz. In circuit diagram (PCB (top) and PCB (bottom) )there is seen how this conversion is performed with couple mixer circuits SA612A and reference frequency … Continue reading

Collection of BASIC Stamp projects

Reynolds Electronics have collected several nicely documented BASIC Stamp projects. BASIC Stamp Microchip modules are single board computers that run Paralax PBASIC language interpreter on PIC , 8051 or Parallax Sx microcontrollers. Program code is stored in EEPROM memory from where PBASIC program commands are fetched to execute by interpreter. BASIC stamp gained their popularity because if their simple programing language – BASIC. BASIC stamp is easy to use and program and is good choice in low volume engineering projects.   Among projects you will find: A 4-digit “SERIAL” seven-segment LED display BASIC Stamp project, r IR transmitter to Rf converter, Infrared data communications, RS-232 Data Terminal, RS-232 Analog Voltage Meter, The Mini SSC II Serial Servo Controller. Basic stamp projects may be compiled and edited with PBASIC software which … Continue reading

Interfacing Nokia 6100 color LCD to AVR controller

Thomas Pfeifer have connected Nokia 6100 132×132 pixel 4096 color LCD to AVR microcontroller. LCD is also used in Nokia 6100, 7200, 6610, 7250 and 6220. He connected LCD to Atmega8 microcontroller:   As there are two types of displays: with Epson chipset(S1D15G10) and Philips(PCF8833), he wrote code for Philips chipset. Firmware is written in AVR-GCC language where image can be uploaded via serial cable. Also there are few videos view sample video on how it works AVR-3D-Engine.