Circuit Lake

The purpose of this project is to build a simple Theremin that can play the base notes (no sharps or flats) from one octave to another, specifically C4 to C5. Instead of using antennas, it uses infrared proximity to sense the position. The device will produce a specific pitch after IR proximity sensor detects the distance between your hand or an object from it. The project uses PIC 18F452 as main processor and Sharp 2Y0A21 or GP2D120 IR Package for the sensor.Chris, the project designer, said that PIC's internal Analog-to-Digital ...

This project is a PIC18F252-based repeater for GPS data. It is intended to connect to hand held GPS receivers that don't have external antennas such as Garmin-38. The aim of the repeater is to allow the GPS to be placed outside, exposed to the satellite view, and allow the user to see the data below decks at the navigation station. The gps repeater displays several pages of data pertaining to both the GPS and the boat electrical system on LCD display. A DB-9 jack is on the front panel for ...

This project is an experiment of capacitive touch sensor. The detector electrode (touch area) is a 10mm square copper plate put on the PCB and covered with an insulation overlay (Kapton tape). An ATtiny2313 with 1M ohms pull-up resister is used for the detector circuit.The capacitive touch sensor detects changes of capacitance at the electrode occurred by closing a conductive object such as a finger. There are several sensing methods for the capacitance. For this project, integration method that used in capacitance meter is applied.The integration time at normal state ...

The projects shows you how to build simple low cost Inductance Meter based on popular IC 555. The 555 works in its most simple rectangle oscillation configuration. In this mode, the duty-cycle should be around 50%, but this depends on the load on pin 3. Over the amplifying transistor Q1 the AC is given on an LC circuit. It oscillates a frequency given by the equation:These oscillating waves are amplified by Q2 and frequency is converted into a voltage by the RC-network of C3 and the amp meter. Due to ...