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Category: Electronics

RJ45 Ethernet Cover

RJ45 Ethernet Cover

I am working on a project and I needed an easy way to create an Ethernet jack from a standard patch cable. I found these cheap RJ45 Keystone Adapters (https://www.ebay.ie/itm/RJ45-Keystone-Jack-Wall-End-Plug-Cat-5e-Ethernet-LAN-Network-Module-Port-Adapter/252314420824) which you can easily wire to a standard Ethernet cable. I needed a way to cover the exposed connections and attach it to the project so I designed a cover for them. The jack has to be slightly modified in order to fit into my design, two clips have to…

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Smart Environment Monitoring system (SEM)

Smart Environment Monitoring system (SEM)

The Smart Environment Monitoring (SEM) system is an Arduino and web based (PHP) system that monitors, records and analyses environmental metrics both inside and outside (using external service) of the room that the Arduino device is located in. The circuit schematic can be seen below. The main sensor used is an AM2302 which is a temperature and humidity sensor. The system also uses a photoresistor to measure light levels. Most Arduinos could be used to build this system, I used…

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Solar Light Refurbishment

Solar Light Refurbishment

My parents have solar lights in their driveway, recently the controllers on some of the lights broke and the lights stopped working. This light has a proximity sensor that switches on and off the main ring of LEDs when triggered and normally when it’s dark only the center LED is on. I couldn’t fix the PCB so I decided to design a circuit to replace this PCB. To make the project easier I decided to not use the proximity sensor….

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Arduino Power Unit

Arduino Power Unit

I needed an uninterruptible power supply for an Arduino Microcontroller. I wanted the Arduino to be powered by a 9V wall adapter with a backup 9V battery. When AC power is available the unit will draw power from the wall adapter, if there is a power cut the unit will seamlessly switch to the battery as a power source and back when power is available. I wanted various indicator lights as well such as during a power cut an LED…

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LED Post Box

LED Post Box

This project uses an Arduino Nano to add LEDs to a post box to alert the user to when there is post in the box. An Post (Ireland’s National Mail Carrier) sell a “DeliveryBox” which is a post box that can take parcels as well as letters. The post worker puts all your post in the box and scans the box which sends you an email. However I wanted a quick visual indicator to alert me when I passed the…

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Laptop Refurbishment Part 2 – SSD, RAM and Windows

Laptop Refurbishment Part 2 – SSD, RAM and Windows

In the last post I started refurbishing a DELL XPS 15 L502X by improving it’s thermals (here). In this post we will look at: Replacing the Hard Drive with an SSD Replacing and increasing the RAM Doing a clean install of Windows 10 In my opinion the easiest way to find a replacement SSD and RAM is to use the Crucial System Scanner which is run by Crucial who are a reputable maker of SSDs and RAM. When you run…

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Laptop Refurbishment Part 1 – Thermals

Laptop Refurbishment Part 1 – Thermals

I refurbished a DELL XPS 15 L502X for my parents. The laptop was running very hot and slow. I decided that in order to refurbish the laptop I would: Clean the fan and heat sink Replace the stock thermal paste Replace the Hard Drive with an SSD Replace and increase the RAM Do a clean install of Windows 10 (This was Windows 10 upgraded from Windows 7) This post will cover the first two points and a follow up post…

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Aritech Smart Alarm

Aritech Smart Alarm

I took an old Aritech CS350 alarm from 1994 and made it smart using an Arduino. I found a great instructable¬† by Ambrose Clarke (http://www.instructables.com/id/House-Alarm-Internet-Dialer-With-Arduino-Reverse-E/) I fitted the alarm as normal to the Garage but I also ran an ethernet cable to the garage. This project was very easy to complete using an Arduino Uno, ethernet shield and a few stock parts. The alarm now sends emails when the alarm goes off and the Arduino acts as an online keypad….

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iPad Contolled lights

iPad Contolled lights

This is project uses an Arduino UNO, an Ethernet shield, a relay and the TouchOSC app to control two lights from an iPad. The following video is an overview of the project. The following is a wiring diagram for the project: You will need to add the Z_OSC library to you Arduino IDE. The Arduino code can be downloaded from this link. You will need to change line 13 of the Arduino code to the IP address of your iPad….

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