Electronics-Lab.com Blog

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.

Drive character LCD Displays using dip switches – [Part 1] [Part 2]

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]

akikorhonen.org writes:

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]

Building large complex boards is very risky. If anything is wrong with the board, the entire board needs to be discarded sometimes after expensive components have been soldered onto them. Instead of have one big board, the display is split into module boards. These modules are the LEDPANEL( front panel with the lights and buttons ), LEDDRIVER( hardware to switch on and off the rows and columns ), and the PROCESSORBOARD( the board that contains the RF circuitry and microcontroller ). If something goes wrong with one of the boards, only that board needs to be redesigned or replaced. A secondary bonus is that the processor board can be redesigned for a different PC connection. An example would be a module with a USB connection to a PC rather then an RF link for cost savings.

A Scrolling Display with RF connection to a PC - [Link]

If you want to build a simple and inexpensive digital voltmeter here is a mini 3 digit display digital voltmeter (this one PIC version).It’s an AVR based voltmeter module.The module has general purpose digital IO pins. You could use it as well to read a digital sensor and display the value.It can be freely programmed, calibrated and even be programmed with a non linear formula. It’s a display where you can define the relation between the measured value and the displayed number. [via]

Mini 3 digit display digital voltmeter - [Link]

One of the first things people want to interface to a design is an LCD display, both to help with debugging their programs and as a way to provide results to the outside world. Unfortunately LCD’s require both a lot of I/O lines (7 at best) and require precise timing and command structure that sometimes are not easy to achieve.The easiest way to overcome all these problems is to create a “front end” to the LCD that will accept serial data and thus require only 1 line from the mcu and almost no programming effort to display some text. [via]

Serial LCD Interface – [Link]