For those who are lazy like me, turn on or off the bedroom light without getting out of bed, simple clap your hands is amazing. Thinking about it I projected one for me. Several projects of clappers can be found on the Internet, and most of them do not use microcontroller. I chose to use a micro planning future updates, such as turn on or off the light with 2 claps, the TV with 3 claps,
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DVD player with 4 and so on. Another update can be a time to turn off the device automatically. The hardware is very simple, just a microcontroller, a electret mic, a relay and some discrete components. The microcontroller is the brain of the project, I used a atmega8 because it was the only I had available. The signal is captured by the mic and amplified by the transistor (BC548), this signal run through a lowpass filter that remove the high frequencies and go to mega8 ADC. To keep the circuit simple, only one transistor is used on signal amplification. Two buttons are used to up or down the sensibility of the signal. You can see the complete schematic below. The components on dotted line are optional. The software was written in C using AVR Studio and WinAVR library. The ADC is read constantly, and the returned value is compared with a variable. This variable can be changed if the user press the button S1 or S2. So, the user can increase or decrease the intensity of the signal necessary to trigger the circuit. If the value of the ADC is less than the variable, nothing happens, otherwise the timer0 is activated and begins counting. At each timer overflow, a variable called The value of variable timer is compared with three constants, burst_time, ready_time and time_out. If the value of the variable is equal to the constant burst_time the value of global variable burst become 1. If the value of timer is equal the constant...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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