Category Archives: Arduino


Bi-color LED matrix display board with Bluetooth

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I shared the details of my single-color 8X40 LED matrix display board project here a few months ago. Here is a nice instructable on making a 7 Bi-color 8×8 LED Matrix Scrolling Text Display with Bluetooth support; which means you can send messages and commands to the display via Bluetooth using a Smart Phone. The author illustrates using an Android-based phone, but any devices capable of sending text messages via Bluetooth would work. The project uses 7 Bi-color 8×8 LED matrices, each controlled by two MAX7219 chips. The beauty of using MAX7219 is they take a lot of work off the micro-controller and

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Automatic re-filler for your pet’s water bowl

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This Arduino-based Pet Water Warden helps your pets to get enough water supply when you are gone. It uses two homemade dip probes to sense the water level in a pet’s drinking bowl and automatically activate a pump to refill it from a reservoir when it gets low. The project also incorporates an Arduino Ethernet shield to send a tweet when the reservoir runs out.

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Electric energy monitor that writes data to a Google Drive spreadsheet

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This recently posted instructable describes a home electricity monitor with Cloud support that saves the measurements into a Google Drive spreadsheet. The project uses Arduino Yun microcontroller board along with a current transformer for sensing current in the mains live wire. The power monitoring is wireless through Wifi, allowing continuous monitoring from a PC or phone and permanent storage on the Cloud.

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Web-based relay controller for home automation

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Home automation is getting increasingly popular these days mainly due to reduced cost and simplicity through web or smartphone connectivity. Here’s a DIY version of web-based home automation controller that allows you to have a set of six relays connected to the end of a piece of Ethernet cable that can be accessed from a web browser anywhere from your house. You can use it to control or program the operation of lights, water pumps, or any other electrical appliances at home. The project uses Arduino (Atmega328) microcontroller and the ENC28J60 ethernet controller chipset.

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DIY mailbox alert system that texts you when letters arrive

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Here’s a DIY mailbox alert system that will free you from guessing, wondering, or making wasted trips to the mailbox only to find it empty. Yes, this Arduino-based mailbox notifier sends you a text whenever you get mail. The device uses a simple light-dependent resistor (LDR) to detect the light levels inside the mailbox. When somebody opens the mailbox, the light level goes up and Arduino knows it is time to send a text. It can also serve as a security device to avoid your mail being stolen if the mailbox is accessed during non-delivery hours. A push switch button

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