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Category Archives: Arduino

Very accurate master clock synchronized to the DCF77 time signal

Posted on September 5, 2014 by R-B Leave a comment

Brett’s new masterclock is Arduino-controlled and keeps very accurate time by periodically synchronizing with the DCF77 “Atomic” Clock in Mainflingen near Frankfurt, Germany. The DCF77 library for Arduino is used to decode the time signal broadcasted from the atomic clock. The time is displayed as hours, minutes, and seconds on six 1″ seven segment LEDs. A 4×20 I2C LCD display is also used in the project to display additional info such as display brightness, sync information, signal quality, auto tune’d frequency, auto tuned quartz accuracy, etc. Both the displays are auto-dimmed based on the surrounding light intensity using an LDR sensor

Arduino pill reminder

Posted on September 4, 2014 by R-B Leave a comment

This Arduino-based Pill Reminder is suitable for people who often forget to take their medicines on time. It has 14 pill compartments in total and each compartment contains pills for a day of week. An RTC chip is used for timekeeping, and LEDs are used to light up the appropriate compartment every day. In addition, a proximity sensor is also implemented to sense a person approaching the device, which in turn, makes the LED blink to attract the attention.

Exploring HLK-RM04 Serial-to-WiFi Module

Posted on September 3, 2014 by R-B Leave a comment

HLK-RM04 is a low-cost UART-ETH-WIFI module developed by Shenzhen Hi-Link Electronic co., Ltd with built-in TCP / IP protocol stack. In this article, Ray shares his first experience experimenting with this module and explores its Serial-to-WiFi capability using Arduino.

Arduino quiz show buzzer

Posted on August 28, 2014 by R-B Leave a comment

This nicely-built quiz game buzzer system is Arduino-based and captures the fastest player or “first to respond” out of four players. A good friend of mine who’s a teacher was doing quizzes in her class making students compete to answer questions… resulting in them complaining they raised their hands before the others. I decided to give her this quiz show type buzzer for Christmas to solve her problems. When one of the players press it’s button (the fastest player wins this), the led of the right colour lights up saying he’s in control… and no other buttons from the other players work,

Infra-red controlled smart AC outlet

Posted on August 28, 2014 by R-B Leave a comment

Infrared remote control for home appliances is a popular project among hobbyists and students. Smart Outlet is a similar project that provides an infrared controlled AC outlet to connect any electric appliance and has an integrated timer in it. The appliance can be turned on and off from several feet away using an IR remote. The device is Arduino-controlled and has a LCD display to provide a menu based interface to the user for its operation and settings.

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