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Fingerprint controlled door lock

Posted on December 15, 2016 by R-B Leave a comment

This fingerprint lock is described in an Instructable posted by JetLab and is about building an Arduino-based electronic door lock that can be installed on almost any access point in your house. The project uses a keypad and fingerprint scanner to grant access to the users by controlling an electric door strike with a relay. I started this project because I was wanted to work with a keypad and fingerprint sensor as well as become more familiar working with LCD’s, I also needed a way to lock my door from the outside so I thought an electronic door-lock would be

Smart WiFi thermostats using ESP8266

Posted on December 12, 2016 by R-B Leave a comment

Another smart wifi-enabled thermostat using ESP8266 and a nice user interface using ILI9341 LCD display along a rotary Encoder and pushbutton. Temperature and humidity measurements are made using DHT22 sensor.

Arduino synthesizer with a 1-octave capacitive touch keyboard

Posted on December 11, 2016 by R-B Leave a comment

DIY audio synthesizers are not new. We have seen before some really cool synthesizer builds using Raspberry Pi and NXP LPC1114FN28 ARM. Here comes TinyTS, an Arduino-based credit card sized (100x65mm) synthesizer. It is a fully open-sourced design with a 1-octave capacitive touch keyboard. The synthesizer parameter knobs includes: DCO: Coarse pitch and Double. The CV out follows the keyboard and coarse pitch. DCF: Filter peak and ENVmod. ENV: Attack and Release affecting amplitude. More details can be found here. Here’s a demo video showing the TinyTS in action.

Another minimalist wrist watch, but with binary display

Posted on December 9, 2016 by R-B Leave a comment

Earlier this week, we saw David Johnson-Davies’ minimalist ATtiny85 wrist watch that displays time using 12 LEDs arranged in a circle like a watch dial. I found another interesting LED-based wrist watch design shared by MACROFAB. It is a low cost watch based on Microchip PIC16F527 and it displays time in binary format. The PIC microcontroller runs in low-power crystal mode using a 32.768 KHz external crystal, that helps to achieve an accurate 1Hz signal required for timekeeping. The Macro_Watch has 11 LEDs. Four LEDs for the Hour (H1 – H4), Six LEDs for the Minute (M1 – M6), and a single Seconds LED for timing

Etch-a-sketch on a VGA monitor using Arduino

Posted on December 9, 2016 by R-B Leave a comment

Kids love Etch-a-sketch drawing boards. Rob Cai shares on this Instructables post how he has built a Etch-a-sketch like drawing tool using Arduino Uno and a VGA monitor. Besides an Arduino board, this project only requires two potentiometers, two tact switches, and four resistors. The VGA signal is generated in software using the VGAX Arduino library contributed by smaffer. I used Arduino IDE 1.6.4. and the VGAx library done by Smaffer and publish on GitHub here. This library allows to use four color with a resolution of 120 x 60 pixels. One button is to clear the screen, the second to choose the color.

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