All posts on November, 2008



RS485 communication system using PIC18F4520

 

RS485 communication system using PIC18F4520
This project is a RS-485 based bidirectional communications system using PIC18F4520 to communicate between several nodes. The project will consist of two separate circuits (per node) a) an RS-232 to 2-wire RS-485 converter and b) a 2-wire RS-485 peripheral transceiver.The converter will allow a PC serial port to be converted to and from electrical signal levels required for 2-wire RS-485 format. The RS-485 interface allows up to 32 standard load nodes on a shared data bus.[more]


Posted in : Communication related | PIC projects | RS232 related

PWM Motor Driver with H-Bridge

 

PWM Motor Driver with H-Bridge
This pulse wide modulated driver is designed for DC Motors with a maximal power consumption of 200 watts. It works with a so called H -Bridge. It has three input pins, two for the direction and one for the pwm-signal. The inputs are designed for logic level signals ecpecially for microcontroller outputs.[more]

Posted in : motor controller

RFID sniffer

 

RFID sniffer
Here is the RFID sniffer.It is used toย� find out if objects are tagged.The RFID sniffer is a simple analog electronic circuit which can detect the presence of 13.56 MHz RFID tags. These tags are commonly used in all kinds of plastic cards like access badges, bank cards, library cards, loyalty cards and so on. Also many other objects may carry RFID tags without you knowing it. Books, toys, and even clothing might be tagged. Carrying tagged objects with you can reveal your identity or whereabouts to anyone equipped with the appropiate tools to read RFID tags.[more]

Posted in : RF projects

Battery Charger for Hand Held Radio Battery Packs

 

Battery Charger for Hand Held Radio Battery Packs
This is a handy little charger that can provide a charging current of up to 120 mA continuously for batteries in the range up to 12 volts.The supply is housed in a small plastic enclosure 90 x 55 x 32 mm.[more]

Posted in : Battery Charger

GPS to SD-Card Data Logger

 

GPS to SD-Card Data Logger
This project combines a GPS receiver module, a Microchip PIC microcontroller and a Secure Digital memory card to make a GPS data logger.The data from the GPS is logged every second with the raw NMEA sentences being written to the SD card. The data written to the card is the GSA, GGA, RMC and GSV sentences which by excluding the carriage returns this should never exceed 512 bytes per second. [more]

Posted in : Data Storage projects | GPS projects

« Previous Page — Next Page »