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PCF8563 based alarm clock

Posted on January 17, 2016 by R-B 2 comments

This project is about a PCF8563 based alarm clock built by Shawon Shahryiar from MicroArena. The PCF8563 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. It features a programmable clock output, interrupt output, and a standard I2C bus to communicate with a host MCU. The project uses the PIC16F877A microcontroller for reading time and date from the RTC chip and a standard HD44780 character LCD for displaying it. The date, time, and alarm settings are performed through a keypad matrix, and a piezo buzzer is used to create the alarm sound. Following video shows the alarm

Advanced Arduino data logger

Posted on January 17, 2016 by R-B Leave a comment

educ8s.tv has posted a video tutorial on building an advanced Arduino data logger that records temperature, humidity, barometric pressure, and ambient light intensity on a micro SD storage card. It uses some easily available sensors, like DHT22, BMP180, and BH1750, for sensing the surrounding environment and the DS3231 RTC module for time-stamping the measurements. The tutorial describes in steps how to setup the complete project on a breadboard. The data logger runs for about 2 weeks using simple AA batteries and the data are stored on the SD card in a .csv file for easy transport to PC for further processing.

MSP430 Launchpad cyclic timer switch

Posted on January 16, 2016 by R-B One comment

This MSP430 Launchpad cyclic timer project is written by Shawon Shahryiar from MicroArena and describes a cyclic on/off timer switch with a standard character LCD for displaying the on/off time as well as the state of the switch, and which can be programmed through capacitive touch inputs. The On and Off times can be programmed separately and the timer cycles endlessly through the set times. Shawon uses the TTP224 integrated circuit to implement 4 capacitive touch inputs in the project. The firmware for the project was developed using Energia IDE and can be downloaded from the link at the end

Automated environmental alert system

Posted on January 13, 2016 by R-B Leave a comment

DJ‘s Instructable describes an automated environmental alert system consists of four gas sensors to meausure the concentration of methane, propane, carbon monoxide, and smoke in the air and are connected to an Intel Edison for wireless detection and alerting. The entire system runs with a 5V 3A power supply and the sensor data are read through 4-analog input channels of the Intel Edison board. He used an Arduino breakout board for Intel Edison for rapid prototyping of his project. An Intel Edison runs the show for the Environmental Alert System. The Edison is mounted on an Arduino breakout board, which makes it easy to read

Electronic Snellen eye tester

Posted on January 12, 2016 by R-B Leave a comment

Snellen chart is the most widely used visual chart across the globe for testing visual acuity. It contains multiple rows of letters that are progressively smaller and is used by an eye doctor to judge patient’s eyesight. Joel Llewelyn, Margot Haas, and Yuchen Liu (three Cornell students) attempted to make an electronic version of Snellen chart that is portable and self-capable of performing the full Snellen eye test at home. The project uses PIC32 microcontroller and a TFT display for showing the letters from the Snellen chart in a progressively smaller font size and the user has to speak over

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