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Physical Computing
Plants watering watcher
Written by admin   
Friday, 03 December 2010 00:00

Authors: admin

This project is a plant watering watcher that is able to flash a LED at a low rate when the soil in the pot plant becomes too dry. The circuit uses a CMOS quad Schmitt and is powered from two AA batteries. Check schematic and PCB boards on the link below.

Plants watering watcher - [Link]


Last Updated on Thursday, 02 December 2010 20:34
Cheap Launchpad based motion detector camera
Written by the machinegeek   
Tuesday, 30 November 2010 00:00

Authors: the machinegeek

Here’s a hack combining a cheap digital camera body and PIR sensor to form a motion detector camera. The project is controlled by a MSP430 microcontroller found in the Launchpad kit.
Via Instructables.

Last Updated on Monday, 29 November 2010 22:56
Serial Port Multi-Channel Temperature Measurement
Written by admin   
Friday, 26 November 2010 00:00

Authors: admin

This project is a device that accurately measures temperature inside a Styrofoam enclosure and compare it to external temperature. To accomplish this it is utilizing the 8 ADC channels of the ATMega48 and used its in-chip USART capabilities to send this data to a PC for logging.

It’s basically a combination of several projects (microcontroller, temperature measurement with LM335, USART serial port communication, data visualization) for minimal cost. (It’s part of a larger project, but it turned out so nicely that I think it’s a good project in itself!) Many of the temperature sensor pages out there are complicated (using segmented displays or LCD screens), don’t log the data easily, or use expensive components. Also, this project was designed (though not yet tested) to allow 8 sensors to be read simultaneously. Check details on the link below.



Last Updated on Friday, 26 November 2010 16:29
Measuring temperature using LM35 Sensor
Written by admin   
Tuesday, 23 November 2010 00:00

This project describes in detail how to use a LM35 temperature sensor to measure the surrounding temperature and display on a LCD screen by interfacing with a PIC microcontrolller. The LM35 sensor gives an analog output voltage that is proportional to the temperature. The output from the sensor is converted to a 10-bit digital number by the internal ADC of PIC16F688 micro. This project provides every details of software and hardware design involved.

Measuring temperature using LM35 Sensor –[Link]

Last Updated on Tuesday, 23 November 2010 14:39
Lightning distance timer
Written by admin   
Monday, 22 November 2010 00:00

Authors: admin

Richard Hodgkinson build a lightning distance timer that is able to automatically calculate the approach or retreat of a thunderstorm. The device is powered from two AA batteries.

Imagine you’re right in the middle of a thunderstorm; the lights have gone out, and there’s nothing better to do than time the number of seconds between a lightning strike and the thunderclap in an effort to see whether the storm is approaching or receding.


Read more: [Link]

Last Updated on Monday, 22 November 2010 13:46
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