Simple 0-9 Counter Circuit with 7-Segment Display show numbers from 0 to 9. It is used in digital counters, clocks and measuring tools. Main parts of this circuit are 7490 Decade Counter IC, 7446 BCD to 7-segment Driver IC. It works with Common Anode 7-segment display with all LED positives joined. Circuit is powered by […]
Indicator Circuits
12V Battery Level Indicator Circuit using IC LM3914
12V Battery Level Indicator Circuit using IC LM3914 show how much battery power is left. It is good for devices using 12V battery and help avoid sudden power OFF. IC LM3914 senses voltage and control 10 LEDs. It show in dot mode or bar mode. It work with 3V to 25V power supply. LEDs light […]
Voltage Level Monitoring Circuit using IC LM339
Voltage Level Monitoring Circuit using IC LM339 very important in modern electronics, as it helps system work correct. To see voltage in real time we need to use voltage level readout circuit. This circuit uses LM339 comparator IC for accurate voltage check and stable reading. Main parts are LEDs that show voltage level and resistors […]
Simple Heartbeat Monitor Circuit using Arduino
In this post we will show how to make Simple Heartbeat Monitor Circuit using Arduino. When we put finger on sensor it count heartbeats per minute. This is important because heartbeat tells doctor about our health. We use Arduino UNO, LCD screen, two buttons, one resistor and heartbeat sensor to build it. Sensor catches heartbeat […]
Interfacing a 7-Segment Display Circuit with Arduino UNO
Interfacing a 7-Segment Display Circuit with Arduino UNO is small electric part which shows numbers. It have 7 LEDs inside and makes shapes for numbers and some letters. We can connect it to Arduino and then it tells what number to show. This article teaches how to connect 7-segment to Arduino UNO and show numbers. […]
Battery Status Indicator Circuit using Flashing LED
Battery Status Indicator Circuit using Flashing LED is an easy to make project. Circuit uses BC547 and BC557 transistor, some resistors, capacitors, one diode and one LED. LED show battery condition by blinking light. It work with 6 to 12V battery and it is easy way to know battery health and it ensures it works […]