These displays are small, only about 1″ diameter, but very readable due to the high contrast of an OLED display. This display is made of 128×64 individual white OLED pixels, each one is turned on or off by the controller chip. Because the display makes its own light, no backlight is required. This reduces the power required to run the OLED and is why the display has such high contrast; we really like this miniature display for its crispness! The driver chip, SSD1306 can communicate in multiple ways including I2C, SPI and 8-bit parallel.
Monochrome 128×64 OLED graphic display – [Link]
This article shows how to drive an OLED module that uses SSD1307 driver IC.
OLEDs are just like LEDs, but are more power efficient (glass display module is rated 8.2mW). Displays using LED provide a large viewing angle (>160 degrees) and good visibility (contrast ratio >2000:1). Together with the low power requirements they are ideal for small battery powered devices like MP3 players. Downside is the degradation of the OLED, as the brightness will fade after many hours of use. Lifetime according to the datasheet is 10.000hrs, but burning in will probably happen sooner.
96×16 OLED display demo – [Link]
If you like PC modding this is cool project for you. This is an USB interface for alphanumeric LCD display like 4×20 which can be controlled with LCDSmartie program. USB interface is implemented by using PIC18F2550 microcontroller. Using USB LCD module you can view many types of information taken from PC like temperatures, time/date, MP3 song titles, view emails, RSS feeds all that LCDSmartie or other program supports.
USB LCD Controller - [Link]
This project is a 7×5 LED Scrolling display based on Attiny2313. It uses easy to find components. Check schematic and PCB boards on the link below.
7×5 LED Scroller on Mini Attiny2313 - [Link]
Seven segment LEDs are popular because they are visually bright and have wide view angles. They are mostly used to display decimal numbers but can also display some letters. This is a nice article describing about the seven segment display modules and how to interface one with a PIC microcontroller to display numbers and characters.
Experimental tutorial on seven segment display – [Link]
This project is 64 pixel RGB LED display able to show interactive animation. The project uses a potentiometer, a led matrix, electronics and custom code. No further documentation is available.
Animation on a 64-pixel RGB LED display – [Link]
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]