ArdLock – Arduino Door Lock

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EswarD2 @ instructables.com has build an Arduino based door lock using Arduino UNO, a keypad and a servo motor.

This a door lock built as fun project.It is quite easy to build and a fun way to learn and improve your knowledge of arduino.I tried to add a 16*2 display but there werent enough GPIO pins on arduino Uno.If You are interested in adding a display you would need an arduino Mega.

ArdLock – Arduino Door Lock – [Link]

MAX30102 – High-Sensitivity Pulse Oximeter and Heart-Rate Sensor

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The MAX30102 pulse oximeter and heart rate integrated sensor module is claimed as the lowest power solution on the market today

The MAX30102 is an integrated pulse oximetry and heart-rate monitor module. It includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection. The MAX30102 provides a complete system solution to ease the design-in process for mobile and wearable devices.

The MAX30102 operates on a single 1.8V power supply and a separate 5.0V power supply for the internal LEDs. Communication is through a standard I²C-compatible interface. The module can be shut down through software with zero standby current, allowing the power rails to remain powered at all times.

MAX30102 – High-Sensitivity Pulse Oximeter and Heart-Rate Sensor – [Link]

U8plus Smart Watch Quick Teardown

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sodnpoo.com has reverse engineered a cheap smartwatch he found on amazon:

I noticed this smart watch on Amazon for the bargain price of £7.51, which was just too cheap to ignore – I didn’t expect much but I was quite surprised at how functional it actually was… Anyhow, it was never expected to stay in once piece for long, and after an hour I took the screwdriver to it.

U8plus Smart Watch Quick Teardown – [Link]

Reverse engineering the silicon in the ARM1 processor

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righto.com has reverse enginnered one of the most popular proccessors:

How can you count bits in hardware? In this article, I reverse-engineer the circuit used by the ARM1 processor to count the number of set bits in a 16-bit field, showing how individual transistors form multiplexers, which are combined into adders, and finally form the bit counter. The ARM1 is the ancestor of the processor in most cell phones, so you may have a descendent of this circuit in your pocket.

Reverse engineering the silicon in the ARM1 processor – [Link]

Lux Meter Module

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LUX Meter project has been design to measure the illumination. Illumination is luminous flux falling on surface area of photo diode. This illumination converted to corresponding voltage using Op-Amp circuit.

Specifications

  • Supply 9 VDC PP3 Battery @ 20 mA
  • Onboard Photo Diode
  • Onboard preset for calibration
  • Range selection via jumper 10mV/LUX, 1mV/LUX, 0.1mV/LUX
  • Interfacing is via berg connector
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 53 mm x 38 mm

Lux Meter Module – [Link]

Monitoring Woodstove Temperature With A MAX31855 Quad Thermocouple BoosterPack

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Spirilis @ 43oh.com forum would like to monitor his woodstove temperature profiles so he build a plugin board for LaunchPad using the MAX31855 thermocouple to digital converter.

This BoosterPack is fancied as a baseboard plugging underneath the LaunchPad, with four holes for mounting studs in case I ever decide to fix it inside a permanent enclosure (probably one made of aluminum due to the heat). I could have pushed the Thermocouple terminal blocks out a little further to fit more launchpads, as I feel this is a bit tight. I chose a Tiva-C LP for my pics because it fits nicely but the BoosterPack is designed with low-power features, contrary to the MAX31855’s own design.

Monitoring Woodstove Temperature With A MAX31855 Quad Thermocouple BoosterPack – [Link]

230 VAC Timer

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Classic AC 230 V Timer project can be used in all application requiring a timer of up-to 3 Minutes to operate or control any AC mains load of up-to 200 Watts. This project is based on the Classic 555 Timer IC, triggering a TRIAC. Input and Output is Optically Isolated.

Specifications 

  • Supply input 12 VDC
  • Mains supply input 240 VAC or 120 VAC ( Read Note for 120V/230V AC)
  • Output: up-to 200 Watt
  • Optically isolated Input / Output
  • Onboard start and reset tactile switch
  • Timer On LED
  • Preset adjustable and jumper selectable for range
  • Power-On LED indicator
  • Screw terminal connector for easy mains supply input and load connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 46 mm x 91 mm

230 VAC Timer – [Link]

RELATED POSTS

Guide to ESP8266 and Tweeting Using ESP8266

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Subhan95 @ instructables.com has written a tutorial on how to use ESP8266 with Arduino and tweet using it.

What can the ESP8266 do?It is limited by your imagination.I have seen projects and tutorials on the internet showing how to fetch a city’s temperature, stock prices,sending and receiving emails ,making phone calls and much much more.I will show in this Instructable how to send a tweet.

Guide to ESP8266 and Tweeting Using ESP8266 – [Link]

PCB Christmas tree

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Well, Christmas may over but we think you may take a look at this well designed PCB Christmas tree and why not consider building it for the next year.

Since I already have an Arduino, and I felt pretty comfortable with it, I decided to use it to control the LEDs. However a full Arduino is way too bulky for such a thing (also too expensive), so I decided to try my luck with something more integrated: a standalone ATMega328P chip directly soldered on the Christmas tree.

PCB Christmas tree – [Link]

Wake-U-Up System

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Zhiyong Hao and Zhuo Chen from Cornell Univercity build A PIC-based Alarm clock system that is different from most alarm clocks known.

This project is aimed to design a ‘Sleep and Wake-up Assistant’. Different from a normal alarm clocks which can only make noise, this alarm clock is designed to wake up a person in a comfortable and effective way by involving sound, light stimulation, motion detection and vibration. The functions of this alarm system are:

Wake-U-Up System – [Link]