3 Digit Electronic timer with Pic16F87
Welcome to the Yugioh card game electronic timer!
This project is an easy to learn about Microcontrollers and its programming. The Yugioh timer starts at 9:59 minutes and counts down to 0. It’s built using a PIC16F87 microcontroller and programmed in C. The counter has three digits, 7-segment LED display common anode type of the LED display which are driven by 3 2N3906 transistors.
The countdown starts at 9 minutes and 59 seconds and decrements every second. Additionally, a small piezo transducer signals a beep whenever the counter has counted down by one minute.
Finally, the counter beeps several times upon reaching zero minute and zero seconds, displaying 0.00. With these features, this electronic counter is a reliable and efficient tool for timing a variety of activities.
The circuit diagram above shows that the 4.5V (3 AAA size batteries) are connected through the toggle switch to supply the power to the circuit, note that I did not use a voltage regulator to convert for example 9V battery voltage down to 5V. The Pic16F84A datasheet shows that it can work from 2V to 6V.
Code
