Arduino LED clock

LED_clock

by embedded-lab.com:

This Instructable describes building of a fun and very simple LED clock using Arduino that displays the time to the nearest half hour using LEDs.

Arduino LED clock – [Link]

New MEC switches can be seen even from afar

obr1567_1

Whether it´s necessary to operate a device in gloves, or you only wish the given push-button was sufficiently big and well visible, new series of round and square caps for series Multimec 5G will solve it.

Well known Dutch producer of top quality switches – company MEC, comes with novelties in a form of relatively big caps for a universal series of push buttons Multimec 5G (lifetime of 10 million cycles).

Series 5G is exceptional by the fact, that it can by equipped by a huge amount of caps of various sizes, shapes and colors. In result, you might even not say, that beneath so different push-buttons

Another PIC-based digital thermometer and clock

PIC18_Clock

by embedded-lab.com:

This DIY digital clock plus thermometer is designed by Joe Farr and is based on PIC18F25K22 microcontroller. The complete construction details of this project including circuit diagrams, PCB layouts and PIC firmware are posted in his website. He developed his firmware using Proton PIC BASIC compiler, which is available for download for free for this particular PIC microcontroller. He uses DS1302 RTC for timekeeping and DS18B20 for temperature measurement. The temperature and time are displayed on four 2″ seven segment LED displays.

Another PIC-based digital thermometer and clock – [Link]

PIR Sensor

photo_th

Project is based on Holtek’s IC HT7610A, which is a CMOS LSI chip designed for use in automatic PIR lamp, flash or buzzer control. It can operate in 3-wire configuration for relay applications. In our project we have used relay instead of Traic to connect any kind of load in output, HT7610B IC is suitable for traic and HT7610A for Relay application. The chip is equipped with operational amplifiers, a comparator, timer, a zero crossing detector, control circuit, a voltage regulator, a system oscillator, and an output timing oscillator.

Its PIR sensor detects infrared power variations induced by the motion of a human body and transforms it to a voltage variation. If the PIR output voltage variation conforms to the criteria (refer to the functional description), the lamp is turned on with an adjustable duration. The circuit doesn’t required step down transformer and can work directly by applying 110V AC or 220V AC (Capacitor C7 needs to change for 220V AC (0.33uF/275V) and 110V AC (0.68uF/275V)

PIR Sensor – [Link]

ATmega based pool cleaner robot

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Here’s a pool cleaner robot built on ATmega by Davide Gironi:

My replacement electronics it is based on ATmega8 micros.
The project is divided into two parts:

timer
cleaning robot

The timer contains the 220 AC to low voltage DC current, and it is out of water, his purpose is to start and stop the cleaning pool robot, which of course is inside the swimming pool.

[via]

ATmega based pool cleaner robot – [Link]

DIY binary wrist watch

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Elia wrote an article detailing his binary wrist watch project:

I have just finished my binary wrist watch project (well, the new revision anyway). I was surprised at how small I was able to make it compared to last time.
I chose to go with the “super-yellow

High sensitivity Accelerometer Family

FreeAccel

by elektor.com:

Freescale have introduced a new range of 3-axis accelerometers offering high sensitivity at low power consumption. According to Freescale the FXLN83xxQ family is capable of detecting acceleration information often missed by less accurate sensors commonly used in consumer products such as smartphones and exercise activity monitors. In conjunction with appropriate software algorithms its improved sensitivity allows the new sensor to be used for equipment fault prognostication (for predictive maintenance), condition monitoring and medical tamper detection applications.

High sensitivity Accelerometer Family – [Link]

Autonomous fire extinguisher

candlefire

by embedded-lab.com:

Trevor Slaton and Dawn Xiang, students from Cornell University, designed this autonomous fire extinguisher that is capable of detecting fires through photo sensors and aiming a water nozzle along two axes to extinguish the fires. Their prototype can detect and extinguish candle fires from about 1 ft. away. Their system uses two servo motors to control the vertical and horizontal position of the water nozzle and a water pump to send out a burst of water from the nozzle. The ATmega1284p microcontroller is used to control the pump as well as the servos.

Autonomous fire extinguisher – [Link]

Constant current resistive load controlled by Arduino

ConstantLoad

via embedded-lab.com:

Inspired from one of Dave Jones EEVBlog videos on dummy load, Lee has built his own programmable constant current resistive load that allows you to draw a set current from any power supply source. His design is based on Arduino Leonardo and uses the high-power BUK954R8-60E MOSFET to control the amount of current flowing through the load path.

Constant current resistive load controlled by Arduino – [Link]