PIR Light Switch

PIR-1You can easily make a Burglar Alarm system using the PIR Sensor module. The PIR sensor module is readily available now and costs less than Rs.100. You can make the complete unit at the cost of less than Rs.200 but its use is worth. The PIR Sensor module has a circuit board with a timer. The timer circuit gives a time delay between 30 seconds to 3 minutes that can be adjusted using the present. It also has a sensitivity adjustment for adjusting the sensitivity from few centimeters to 10 meters. In some modules, an LDR is also provided for night time operation only.
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Ultra simple FM Transmitter


With this tiny FM transmitter , you can transmit your voice or audio to an FM Radio. Its range is 10-25 meters in the properly tuned condition.
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