Mobile robot with sonar scanner

Robot uses stepper motor to rotate the sonar sensor and it covers 180 degree. Each 45 degree, a sample is taken. There is a LED display which works like radar, and shows the detected obstacles.
Moreover, Robot can switch to remote control mode. So,we can simply control the motion and get samples using RF transmitter.

Circuit Diagram:

Download Source Code of Micro controller using C

                                         

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Posted in: Microcontroller

Infrared entry alert door

An IR transmitter and IR receiver placed at either side of a doorway sends and receives IR stream. If the beam is broken, a buzzer will beep or a relay will trigger. Please read "readthis!.txt" for all information.
Welcome to S2P Community.
Circuit Diagram:
Transmitter:

Receiver:

Everything included, source, assembler, programmer, and Receiver and Emitter datasheets in docs folder.

                                         

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Posted in: Microcontroller

How to make Temperature & Humidty sensor Using AVR Microcontroller

Temperature & Humidity sensor
This is a low cost way of measuring temperature and humidity with a computer interface and is intended to be an entry level project for high school students on a tight budget.

Main Parts:

• Microcontroller ATMEGA8
• Humidity sensor HONEYWELL HCH-1000-002
• Temperature sensor LM335AZ
• Crystal 3.6864 MHz
• Serial interface MAX232
• Humidity sensor interface 74HC4060

Circuit Diagram:

Download Full Circuit Diagrams and Source Code of Microcontroller in C..
                                         

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Posted in: Microcontroller