Tachometer is used to measure the rotational speed of any shaft or disc. The unit of the measurement is rotation per minute or just RPM. This project describes a contact-less tachometer based on PIC16F628A microcontroller. The rotation of a disc is measured through a set of IR module that converts one complete rotation into a pulse. The result is displayed in a multiplexed seven segment display.
Contact-less Tachometer using PIC16F628A Microcontroller – [Link]
This project shows how to build a Panaplex display using some electrodes and a jam jar as the vacuum chamber. Panaplex is a gas-discharge plasma display related to the Nixie tube. The builder, Lindsay Wilson, explains how it works:
The entire thing is based on using a jam jar as a vacuum chamber. Each of the cathode electrodes is made from a 2cm length of copper wire. A stainless steel M3 screw is soldered to the middle of the wire. This allows it to be screwed to the support plate, which is made from a piece of ceramic tile. It was very easy to drill the 3mm holes with a diamond drill – the tile is made from sintered ceramic powder and is quite soft. A solder tag is mounted on the back of each cathode screw which allows electrical connection to be made to the respective cathode.
Homemade Panaplex display - [Link]
The device comprises two parts: LED control board and LED display board. The two PCBs are designed to fit together one behind the other using two sets of dual row connectors and 4 spacers. One of this connector is used for the electrical connections, while the other is only used as a mechanical connecting element.
Dot matrix LED running display - [Link]
This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The circuit employs the ADC (Analogue to Digital Converter) I.C. CL7107 made by INTERSIL.
Led display digital Voltmeter – [Link]
Connecting a LCD display to your personal computer is an easy job. Displaying data from your PC to a LCD can be proven very exiting, so give it a try and build your own today!
Build your own printer cable LCD Display - [Link]
Jeri Ellsworth show us how she build EL wire and electroluminescent displays. In the first video above, she shows how she twisted the enameled and bare wires to create the EL wire detailed in her previous vid. In the second video above, she shows how she used some etched junk circuit board and Luxprint EL ink to create an electroluminescent display. [via]
EL wire and display hacking with Jeri Ellsworth - [Link]
PICtris project is a tetris game using dot led displays controlled by a PIC microcontroller. PIC18LF4520 is drawing 2D graphics on LED display and four buttons control and rotate the blocks. Find schematics and source code on the link below.
PICtris: Tetris on a PIC MCU - [Link]
In Part 1 of this tutorial learn how to drive HD44780 LCD displays using plain dip switches and some other components on a breadboard. Characters are written on LCD by controlling data bits using dip switches. That’s a nice way to learn how HD44780 displays are controlled. In Part 2 learn how to drive the same LCD using an Atmega8 microcontroller and write some code to instuct LCD. In this part a AVR 28 pin Development Board is used. Check tutorial on the links below.
How to connect a Nokia LCD to a AVR-Controller. he Display (which is used in Nokia 6100, 7210, 6610, 7250 and 6220) has a resolution of 132×132 pixel @4096 Colors. The visible area is about 3cm x 3cm in size. It can be found cheap at *bay.
Controlling a Nokia 6100 Display with an Atmel-AVR – [Link]
I’ve always liked all kinds of led displays and a rotating one is maybe one of the most interesting ones. I’ve been planning on building one for many years (actually I made one a couple of years ago, but it is was quite crappy). I finally got some good ideas on how I’ll make the first proper display and started to plan the schematics and the pcb with Eagle. You can see the finished ones below.
Rotating led display - [Link]