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RS232 Serial to USB Converter
Posted on Thursday, May 6, 2010   •   Category: USB Circuts


This is simple RS232 Serial to USB Converter that doesn’t need any further explanations. You can use it for any projects that might need it. Diagrams for USB and DB-9 female connectors are provided.


Wireless Temperature and Humidity Sensor with USB
Posted on Thursday, May 6, 2010   •   Category: AVR


This project is based on obdev's RemoteSensor example and their firmware-only USB implementation; the main change is the replacement of the analog sensors with a Sensirion SHT11 digital temperature and humidity sensor.


Half-Wave Dipole Antenna (Open Dipole)
Posted on Thursday, May 6, 2010   •   Category: Antennas


It accepts load from 75 ohm source and has much smaller power output than Ground Pole Antenna. Use this antenna only when you don't have GP Antenna. Construction: Two aluminum rods ,each of length "L" in meters are joined together through an insulator as shown in fig. From center, 75 ohm cable is feeded just like ordinary TV antenna.


NiCd Charger with Thermal Peak Detection
Posted on Sunday, May 2, 2010   •   Category: Battery Chargers


The electric model aircraft and car industries have produced a bewildering array of field chargers for NiCd motor battery packs. These range from simple 6 or 7 cell chargers consisting of a resistor and mechanical timer, to more complex chargers with peak detection, cycling, and the ability to handle 36 cell packs.


Ultrasonic Parking Assistant
Posted on Sunday, May 2, 2010   •   Category: Sensors


The basic theory behind the Parking Assistant is the Sound Navigation and Ranging (SONAR) technique that is used for finding the distance and direction of a remote object underwater by transmitting sound waves and detecting reflections from it. First, a series of short ultrasonic pulses are transmitted using a transducer that changes voltage into sound waves. The transmitted pulse is reflected off an object, and the reflected wave is then received by another transducer that converts sound waves into voltage. The transmitted signal is also known as the ‘ping’ and the received signal is known as the ‘pong’. By counting the elapsed time between the ping and the pong, the distance between the device and an object can be easily calculated by multiplying the elapsed time with the speed of sound.


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