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Tag Archives: Clock

AVR Alarm clock with temperature and humidity meter

Posted on November 23, 2015 by R-B Leave a comment

This AVR based alarm clock uses PCF8563 for time keeping and has extended functionality of thermometer and humidity meter using DHT11.

First, let me introduce you my project. I made an Alarm clock with extended functionality & thermometer and humiditymeter. Everything started when my friend (who used to bring me some old electronic rubbish and I used to check if there’s not something useful) brought me some cashing register display similar like that. When I first see them I knew that I will made from it alarm clock.
I’m programmer and I used to program in many programming languages but this year I started programming in C for Atmel microcontrolers (attiny 85, atmega 8, atmega 328, atmega329, atmega 128 etc…). When I discovered DHT11 (temperature and humidity sensor) I programmed simple clock with thermo&humidity meter. I haven’t got any case for my project so I imagine that when I cut off column from cashing register display case I will have the case of my dreams for my project.

AVR clock with temperature and humidity meter

Hard disk POV clock

Posted on September 11, 2014 by R-B Leave a comment

This Instructable describes how to build your own persistence-of-vision (POV) clock using Arduino and the motor salvaged from an old hard drive. A small cut made on the one of the disks along with an optical sensor arrangement is used for precise positioning and timing of the rotating disk, which is the key in the operation of any POV based display.

POV clock using hard disk motor

Real-time clock and Temperature display on 16×8 LED Matrix

Posted on October 5, 2010 by R-B One comment

Digital clocks and temperature meters are very popular projects. There are tons of such projects available on internet. This one is little bit different. This displays time and temperature both scrolling on a 16×8 LED matrix.

PIC18F2550 is the brain of this project that controls the columns of the display through A6276 (a 16-bit serial input, constant current latched LED driver). The rows are controlled with a 74ACT164N (8-bit serial-in parallel-out shift register). The required current to drive the rows are provided by BC337 transistors.

A DS1320 serves as the external real time clock, whereas the temperature measurement is performed with LM35, a precision centigrade temperature sensor from National Semiconductors.