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Here is a simple, automatic water-level controller for overhead tanks that switches on/off the pump motor when water in the tank goes below/above the minimum/maximum level. The water level is sensed by two floats to operate the switches for...
Most battery chargers stop charging the battery when it attains its maximum charging voltage set by the circuit. This 12V battery charger circuit charges the battery at a particular voltage, that is, absorption voltage, and once the maximum charging...
This project describes the implementation of a voice-controlled robotic car using Arduino. In this project, the user gives specific voice commands to the robot through an Android app installed on the smartphone. At the receiving side, a Bluetooth transceiver...
Presented here is a simple pedometer (Distance Counter) circuit. It measures the distance covered by you while walking. It may not work very well for running! Circuit and working Fig. 1 shows a circuit diagram of the distance counter. The circuit...
Pulse-width modulation (PWM) or duty-cycle variation methods are commonly used in speed control of DC motors. The duty cycle is defined as the percentage of digital ‘high’ to digital ‘low’ plus digital ‘high’ pulse-width during a PWM period. Fig....
This scope reads input signal and displays the output waveform on a graphical liquid crystal display (GLCD) having 128×64-pixel resolution. The signal is fed to ADC pin of ATmega16 microcontroller (MCU) through an operational amplifier (LM358). The ADC continuously...
This toy organ for children uses a readily-available force-sensitive resistor (FSR) and an NE555 timer IC. Resistance of the FSR varies with the amount of force or pressure being applied on its surface to play the toy organ. Circuit and...
This wireless LCD display shows information sent from a smartphone. The user can send text messages with up to 32 alphanumeric characters to the LCD within Bluetooth range of about 10 metres. This project can be extended and implemented in...
This article describes the implementation of a digital frequency meter using Arduino Uno to determine the sinusoidal frequency signal in the range of 20Hz to 5kHz. The logic involves counting the total number of pulses per second that appear...
This circuit can be used to control up to four electrical devices through a cellphone or computer. The main advantage is that you can login from anywhere to control the device(s). If you try to login using invalid credentials...