This system, with its simplicity and cost-effectiveness, can be a valuable addition to both three- and fourwheelers. Fig. 1 shows the author’s prototype on a breadboard.
Circuit and working
The circuit diagram of the automatic wiper control for three/four-wheelers is shown in Fig. 2. It is built around a 12V battery, timer 555 (IC1), motor driver L293D (IC2), 5V voltage regulator 7805 (IC3), and a few other components. LED1 acts as a power-on indicator when switch S1 is turned on, activating the wiper control system.
The heart of the device is the 555 and L293D. The 555 timer (IC1) is a highly stable integrated circuit used for generating precise time delays or oscillation. It is wired as an astable multivibrator. In a traditional astable multivibrator circuit, a duty cycle of 50% or less cannot be generated. To achieve a duty cycle of less than 50%, diode D1 is added across resistor R3, resulting in an output frequency of approximately 0.03Hz. The output of IC1 is given to transistors T1 and T2 to provide pulses, which are used as the inputs of IC2 to drive the L293D.
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Denne historien er fra October 2024-utgaven av Electronics For You.
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Wearable Automatic ASSISTANCE GLOVE
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From a nonchalant teenager to authoring a book on Verilog at 25 and launching successful IPOs for startups on the US stock market, Rajeev Madhavan exemplifies how the right guidance can transform a life. This is the story of one of Silicon Valley's most influential venture capitalists, as narrated to Yashasvini Razdan.
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