Circuit Lake

This wireless temperature sensor is developed based on PIC12F675 microcontroller. The project is equipped with DS18B20 1-Wire temperature sensor and Sure TTL Bluetooth Module.The advantage of using Bluetooth than Xbee module is that no custom hardware is required on the receiving end and almost all modern laptops have an integrated Bluetooth chipset, so no more hardware is required on the PC end. Bluetooth Thermometer firmware is written in PICBasic and is compiled using ProtonIDE. You can download firmware, schematic and source code here. PIC Bluetooth Thermometer is designed by Jamie ...

The goal of this project is to build image scanner that uses a phototransistor array to detect light intensity instead of CCD overlaid with a photoactive layer of silicon. The system uses internal ATmega644 Analog to Digital converter to capture light signal from sensor. The data then transmits to MATLAB for image processing through serial connection. To allow scan a large area, array of phototransistors are attached to an X-Y plotter. The scanner control is performed by MATLAB scripts.The scanner is started by calling a function in MATLAB interface and ...

This metal detector project is extremely sensitive and capable of detecting very small objects at a depth of at least 8 inches. It uses beat frequency oscillator (BFO) method. User need to do some adjustment to the relative temperature before use it since it is not extremely temperature stable. The oscillators circuit operate at frequency of 494 KHZ, just below the bottom end of the AM Broadcast Band. Although this is a bit high for a BFO metal detector, it allows for the finding of very small objects such as ...

This low-cost stripped down mobile payment system features Radio Frequency Identification (RFID) for identification, 4-digit security pin authentication and Ethernet Data Transfer. The ATmega32-based project prototype is intended for a low-cost secure payment system that has the potential to change lives in rural areas of developing countries.The project is implementation of complete mobile-payment ecosystem comprised of RFID-enabled phones and text message (SMS) transactions to access a virtual account- a simple, fast and safe solution for financial transactions. Example application of the project is users would be able to pay for ...