Handy count down timer with bright display

There are many uses of countdown timer. It can be used for PCB development, in a kitchen or during workout. All you need that timer was easy to set up and start. Umetronics have build simple PIC16F886 based countdown timer with four bright 7-segment displays. LED displays are driven using TLC5916 LED driver and couple dual P-channel MOSFETs. Time can be selected with rotary encoder which comes with button for select. When timer runs out there are two options for notifying – one is display flashing and another micro-switch selectable sound option along with green LED indicator. Sometimes sound might be annoying, so you can always turn it off. Timer is two AAA battery powered. So it is small portable timer for any use. Continue reading

Time Displays Won’t Be a Problem Anymore!

Clock is one of the common electronic gadgets in every household. Honestly, would you ever figure out the life without the existing of clock? Yep, it must be very horrible, isn’t it? Well, if you want to own a stylish clock, but you’re not decide to buy it from the marketplace, maybe this cool Radio Controlled Clock with Large-sized Display can be a good assistant here. Let’s go through the project. First thing first, the charged part of this Radio Controlled Clock is comprised with a display circuit, which is making it easy to see using the large-sized 7 segment LED. In addition, an LED matrix is being used for the display of a day of the week. The even more interesting part is the display is included with a Japanese character (Kanji), which is indicating the seven days in a week! The PIC16F877 is applied in this project, as it has 40 pins. Latch registers are used to maintain time information for the display. Well, you can make a circuit compact, by included D-FF of the 7-bit x16 circuits… Continue reading

Adjustable count-down timer with PIC16F84A microcontroller

This is good looking and practical device that may be useful in many areas where count down timer is needed (no bombs please). Its time can be adjusted in range from 1 minute to 99 minutes. It displays time sequence on BCD decoded 7 segment LED display. When count down finishes – timer sends a control signal to relay. Complete design is made on wiring technique, so no PCB is available. Project is very well described with circuit operation animations what is really helpful for circuit beginners. Source code is also documented well with flow charts. Assembly code and hex file may be downloaded here. Continue reading

Control 3×7 segment LED display with one MCU pin

ibsimed1 have developed a single I/O-Pin 3×7-Segment Display board. It only needs one microcontroller I/O pin and power source.     The board itself is very simple but idea is great – it uses three serial to paralel converters 74HC164 which activates LED segments. As it is said – display board uses only one I/O pin which also serves as CLK source for serial to paralel converters (from 500kHz to 8MHz). Synchronisation is done by connecting microcontroller I/O pin to CLK through RC Low-pass Filter. There is an AVR code example which can be run from any AVR microcontroller. In this Example PB0 is the general I/O-Pin, but this can be easily changed. Project can be downloaded Here. Continue reading