Remote weather station receiver module

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. Continue reading

Automatic plant watering device

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. Continue reading

Control your PC with TV Remote

Remote control developed by Ajay Bhargav can be used to control PC remotely. It can be used for volume control in Windows media player and mouse cursor movement control. For this you can use almost any TV remote with RC5 coding. IR command reception circuit simply consist of ATMEL AT89C2051 microcontroller and TSOP1738 IR receiver. Project files also include firmware written in assembly language and compiled hex. Also you will need application for Windows which is included in package. Continue reading

Yet another USBAVR-ISP programming adapter

If you are planning to make AVR USB-ISP programming adapter you may want to consider this version which is compatible to USBasp hardware.   Major features adapter has: small hardware design; STK500v2 compatible; AVR910 Support (alternate Firmware or Atmega168) ; Single side usable; Has 10 pin,6 pin and connectors; 1 kHz – 3 MHz ISP frequency ; Target Status LED´s; Target can be supplied with 5V @ 100 mA max from the programmer; Automatic shutdown when current is to big; Automatic detection of highest ISP Speed if wished (only with Atmega168); ANSI and VT100 compatible Terminal mode to make Settings and view Target Information without Programmer Software USB/RS232 Converter(optional); Bootloader Support. Files are available in Eagle CAD format, PDF for convenient view. Also you may find Target 3001 format and Sprint-Layout. Project itself is well documented and easy to follow. Hardware and firmware are constantly improved what makes this tool even more useful. Continue reading

50MHz frequency counter

This is one nice frequency counter developed by Peter Cousen. This is really low cost frequency counter as it uses elements available world wide.   The frequency meter can measure frequencies with 1 Hz resolution when measured frequency is up to 100kHz. Other features include: Auto-ranging with floating decimal point. Up to 7 digits displayed. Auto-adjusting gate speed (0.1 sec to 1 sec). Simple, ease to assemble, and highly stable readout. Sensitivity approximately 100 mV RMS (100 Hz to 2 MHz), 800 mV RMS @ 50 MHz. Input overload protected. Circuit and firmware are available for download. You may want to check out modified version which allows counting up to 80MHz. Continue reading

LPC213x development board

If you need simple LPC213x ARM microcontroller series test board you should try the one Ulrich Radig has constructed.   Board itself is simple but it covers all I/O that allows to cover all microcontroller functionality. Project files are available for download in Eagle CAD format. Continue reading