PIN Diode Based Fire Sensor
Here is a PIN diode based fire sensor that activates an alarm when it detects fire. Thermistor based fire alarms have a drawback; the alarm turns on only if the fire...
Seismic Sensor
This circuit detects the movements of humans or animals. Whenever it detects any movement, a buzzer starts beeping and a red LED starts to blink.
Microcontroller-Based Moving Message Display
LED-based moving-message displays are becoming popular for transmitting information to large groups of people quickly. These can be used indoors or outdoors. We can find such displays in areas like railway...
Digital Counter
A counter whose logical output increments in steps on receiving clock pulses is used for a variety of counting and timing applications. It is at the heart of digital clock circuitry and other similar timing devices.
Digital Pulse Tester
Here is a small digital pulse tester that can be used to test and troubleshoot digital circuitry. The circuit is essentially a pulse generator activated by a single press-to-on switch (pushbutton)....
Arduino-Controlled Namaste Greeting Robot
The concept of controlling various servo motors through Arduino Uno board is introduced here with a fun project called ‘namaste Greeting robot.’ The robot turns its head by 180° and scans...
Corona COVID-19 Detection Device
This is a concept DIY of COVID-19 Corona Detection Device that helps to detect the symptoms of COVID-19, so as to help individuals quarantine themselves and practice social distancing. The DIY works...
Clap-Based Digital Volume Control
This clap-based digital volume control offers four levels of volume control. With each clap, the volume of the audio system increases. After the fourth clap, the level of volume returns to...
Touch Alarm
This is a new type of touch alarm that uses an RF oscillator at its input. One special feature of this touch alarm is that it can use a big-size touch...
Soccer Robot
This soccer robot can move forward, reverse, forward-left, forward-right, reverse-left and reverse-right with the help of an Android phone.
