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This is a small setup that can be used to count the number of people passing by any place and display it on the serial monitor of the Arduino ide. It can be used to monitor chaos occurring at any place. HARDWARE COMPONENTS The components required to implement this project are: •        ARDUINO UNO •        ULTRASONIC SENSOR •        BREADBOARD •        BUZZER •        JUMPER WIRES ( as per the requirement)   CONNECTIONS: Interfacing of   ultrasonic   sensor with Arduino Uno: o   VCC: 5V supply  o GND: GND of UNO o Trig: pin number 2 o Echo: pin number 3   Interfacing of piezo buzzer with Arduino Uno: o   Positive terminal : pin number 10 o   Negative terminal : GND     Circuit Design           CODE:   int pie...
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Police Light Blinking using 555 Timer

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In this project, it is shown how to design Police Lights using 555 Timer IC and CD4017 Counter IC. This circuit flashes Red LEDs for three times and then Blue LEDs for three times and this flashing action repeats continuously. Introduction In this project, we will try to implement the blinking of police light. The circuit uses 555 timer IC and a decade counter IC CD4017. Here, the 555 timer runs in Astable mode. Decade counter 4017 counts the incoming pulses and activates its outputs, and blinks the led accordingly.   555 Timer Based Police Lights Circuit Principle Here 555 timer produces continuous pulses via pin 3(output pin). The width of these pulses can be varied by varying the resistance (R1, R2) or capacitance (C1) connected in the circuit. These pulses are given as input to the decade counter IC. For every incoming pulse the output state of the decade counter gets incremented. •      For 1st pulse – blue led glow •      ...
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