Cell Phone Jammer Using IC555

A Simple Cell phone jammer using IC555.

GSM Controlled Robot

In the project the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed a tone corresponding to the button pressed is heard at the other end called ‘Dual Tone Multiple frequency’ (DTMF) tone.

8x8 Dotmatrix Scrolling LED Display

Here 64 leds which are connected to an Matrix display. The Anodes are drived through an Driver IC UDN2981 and the cathodes are drived through ULN2803. The Atmega8515 is used in this project to control the display. The microcontroller is programmed with Bascom AVR.

Infrared Remote Switch

A Simple Infrared remote control circuit.

Showing posts with label Light Detector Circuit. Show all posts
Showing posts with label Light Detector Circuit. Show all posts

Light/Dark Detector Circuit

 Abhishek Kamdi  No comments

This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light.

Schematic-

Parts List-
R1 - 1 - 100K Pot
Q1 - 1 - 2N3904 NPN Transistor
Q2 - 1 - NPN Phototransistor
RELAY - 1 - 9V Relay
MISC - 1 - Board, Wire, 9V Battery Snap (if battery used), Knob For R1

Notes-
1) R1 Adjusts sensitivity
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