Arduino 4 Digit LED 7-Segment Countdown Timer based on Arduino MEGA will be shown in this post. For LCD version of this design follow this link. Similar project that uses PIC16F876 MCU can be found at this link. Raspberry Pi version is also available here. Countdown timer will accept 4-digit initial value from 4×3 membrane … Read more
Basic frequency counter capable of measuring 0-5V square wave up to 100kHz can be built using just 2 components: Arduino MEGA board and 2×16 LCD display. For PIC16F876 version click here. Frequency counter code is also very simple. It uses a standard pulseIn() Arduino function to measure the time it takes for pulse to go … Read more
This post is about building a 3-digit countdown timer based on Arduino MEGA. Up/Down counter also available at this link. The timer will wait for 3-digit number to be entered via 4×3 keypad and then start counting down to zero. Each count is 1 second long. A number up to 999 seconds can be entered. … Read more
Arduino Ohm Meter is one of the simplest circuits that can be built with minimal number of required components. As can be seen from design schematic a standard 2×16 LCD display and 3 resistors are all you need to complete this project. The value of unknown resistor marked with ? will be shown on the … Read more
In this post I’ll show you how to interface a RTC module DS3231 Real Time Clock with Arduino. This particular module uses I2C protocol to transfer current time to a micro controller. DS3231 library and header files should be installed on your computer and included in the code, otherwise you won’t be able to compile … Read more