Blog Archives
Posted on 01 Jun 2008
This page describes how to communicate with HD44780-based LCDs (Liquid Crystal Displays) using an Atmel AVR microcontroller.In many microcontroller applications some sort of display is needed to present information and status of the controller to the user. Although a few LEDs can provide a lot of information, a more advanced display is sometimes needed. A solution which is quite often seen is using a HD44780-based character LCD module. These modules come in various configurations from one line of 8 chars to 4 lines of 40 characters.[more]
Posted on 19 May 2008
This project is a short range, infrared and ultrasonic scanner that uses a standard hobby servo to move the sensors and a color LCD screen to display the information from the sensors. The information displayed on the LCD is an overhead view of the scanning area, with increments of distance from the sensors. [more]
Posted on 18 May 2008
Demo-application for Philips LPC2000 ARM7TDMI controller with a KS0108/KS0107-based graphics-LCD (128*64 pixels), DCF77 time-receiver and Onewire-Bus (for DS18×20-Temp.-Sensor).The time and date are received with a DCF77-receiver-module .The DCF77-signal is transmitted from a station near Frankfurt/Main, Germany and can be received all over Europe, North Africa and the Middle-East. [more]
Posted on 18 May 2008
his is a student project from Cornell University.It designed by Reid Gurnee.He writes:
My senior project is to design and build a digital oscilloscope for Professor Land. This project involves a number of design challenges. On the analog side, I need a fast, low noise A/D converter. In addition, the circuit requires a -20V bias from a 5V supply. In the realm of digital, it involves interfacing two micro-controllers with each other, an LCD display, and an analog to digital converter. With such a broad range of challenges, I searched for help from my professors and contacts I made on the web. I was successful in getting help on floating point arithmetic for an 8 bit micro-controller and LCD interfacing.
Posted on 18 May 2008
Simple negative power supply (-5V / -12V / -15V)
Sometimes you need a simple negative power supply. The best example is the contrast PSU for common small LCD device. Building -5V from a battery or a wallmart supply isn’t really easy.Here is a simple design small device that is able to provide -5V, -12V, -15V. He used the MAX 764/765/766 series.[more]
