This multimeter was build as an addition to power supply unit by Zbyszek.

This unit uses ATMEL Atmega8 microcontroller which reads voltage (0…30V with resolution of 10mV), current (0…99A with resolution 10mA) and displays information on LCD. All you need is to mount multimeter to PSU module according to this diagram. Do not connect to voltages more that 50V as this may be dangerous for adapter and you. Author uses this multimeter for charging of RC Li-Pol cells. For this purpose you need to flash desired firmware which displays capacity passed to load, this way you can see how much cells are charged.

This is really interesting FPGA project because it has 24 logic input channels that is sampled at high rate while stream data is sent to PC via high speed USB 2.0 port – what means hundreds of megabytes.

Logic analyzer is built under Altera Cyclone II FPGA (EP2C5T144C7N) and a NET2272 USB controller from NetChip. Board is USB powered with necessary voltage converters on board.

The board has three connectors :

• 10-pin connector for JTAG configuration of the FPGA. Its pinout is ready to be used with Altera Byteblaster cable.

• 10-pin connector is for connecting a serial FPGA configuration device;

• 26-pin connector is for connecting the probes.

Author provides full schematics of logic analyzer, source and a quickly written Linux driver to get board running.

Ficara Emilio have built and adapter which receives information from remote radio station (Oregon Scientific) module via 433MHz RF channel. Weather station provides temperature and humidity data. But to receive such data you need to have a receiver which usually is included in the weather station kit. But what if you want to receive data from weather station which is neighborhood or you want to to see information on computer screen.

Receiver adapter is build on Attiny2313 AVR microcontroller which decodes data sent from RF receiver. After this MCU sends information to USART port. On PC side you can use program which reads data from RS232 port. All necessary files are available for download from project page. I assume that with small software modification this adapter could be used for any RF data receive and convert to RS232.

This device may be useful for florists and other who like green environment at home but forget to water them regularly to water them. So why not to automate this process with simple embedded system which controls water pump. Device as design project was developed by student Gang Xie in Stanford University.

Device not only waters plant regularly but has a real time clock for exact time counting, LCD which displays time and system states, speaker for alarming, push buttons for changing states and time. Microcontroller controls water pump through relay. Project software is written in AVRGCC C language. Design could be improved by adding humidity of soil reading through ADC channel.