Movement tracker with accelerometer

This device so called Station Master is small key ring sized device which tracks movement in the train. As train goes, device vibrates, but when train stops, it generates alarm after predefined number of stops. So you don’t miss your station. Device is based on Atiny13 microcontroller and MMA7260 3 axis accelerometer from Freescale. Alarm is generated by cell phone vibro motor.   Project files include schematic and assembly program which is very compact due to smart program optimisation – especially filter part, where movement signal is detected from noise pattern. Continue reading

Power AVR microcontroller with AA battery compactly

Tired of using huge batteries in embedded design? Well Guy from Spritesmod managed to power AVR microcontroller from single AA battery with simple circuitry which is driven by AVR microcontroller itself. As industrial devices uses DC-DC converters to rise voltages like from 1.5V to 5V and so on, there is same principal used as well, just DC-DC converter control is done bu AVR MCU itself.   He didn’t use dedicated PWM control chip, but managed to drive converter with PWM generated with Attiny13 this way occupying one timer for this. Here is this fancy circuit. Of course to before MCU can generate control signal it has to start, for this there is starter button used, which rises voltage for short time to suitable when pushed. Then microcontroller starts and continues … Continue reading

Cornell University AVR student projects

At the end of academic year ECE476 Cornell University students produced about 40 new projects mostly based on Atmega32. As every year students have their responsibility to choose their own final project. So there you can find various interesting ideas and designs including video games, robots, MIDI synthesizers, clocks, speech recognitions and so on.   Projects here are accumulated since 1999 Spring(over 200 older projects). So you can surf inside pretty big knowledge base and find ideas, solutions and inspiration for your own designs.   Continue reading

GPS mobile phone controlled by AVR

The goal of this project was to build affordable mobile tracker. Device can be put in a car where it can trigger an alarm when car gets stolen.   Device itself is very simple as GSM module already comes with GPS module (GM862) built in. Alexander Weber connected this module to Atmel’s Atmega8 microcontroller (circuit) and communicated using serial modem communication protocol. Device can send text SMS message with device GPS position data. Project author provided only eagle circuit.   Continue reading