Braincafe Robotics











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Darlington pair touch sensor

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hi people.. I am Saksham from Lucknow, India. This is my new darlington pair touch sensor made by me, using four NPN transistor BC-547 arranged on a breadboard. When we touch the "touch plate" a very little amount of current flows from our body to the base of the transistor. The two transistor amplify the current and light up the LED. Darlington pair touch circuit... LED lights up by touching the "touch plate"       a schematic of the circuit       only difference is that i'v used 4 transistors in this format
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EMF (Electro Magnetic Field) detector

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Hi guys, I'm Saksham Prakash from Lucknow, India. Here is my newly made EMF detector. It will light up an LED whenever it is brought close to electricity. Working (Simple electromagnetism)- Wherever there is a flow of electric current (in an electric appliance), there is an electromagnetic field generated (around the wire Fig. 1) . When the antenna (coiled for better results) is brought close to it, current is induced in the antenna. The Arduino micro controller is programmed to detect this tiny amount of current and if it is above the normal criteria, it lights up the LED.  Program- void setup(){                                                    pinMode(A5,INPUT);                                     pinMode(9,OUTPUT);       ...
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