Blog Archives
Posted on 02 Apr 2008
This is a simple circuit which can detect when you touch a sensor connected to one of the sensor inputs. It can be used to add a touch switch to your computer for example. It uses an AVR micro controller, the AT90S2313. This is overkill. You can add a lot more sensors than the two sensors.The basic idea is really simple. Make one pin output and another input. Connect a resistor between these pins.The resistor together with the human capacitance forms an RC network. The AVR set the output to low and then make a transition from 0V to +5V. 5 µs after this switch, the logic level at the input pin is sampled. If someone is touching the probe connected to the input pin, the capacitor (=human) will not be fully charged, and the input will be a digital 0 and vice versa.[more]
Posted on 08 Mar 2008
An example of parallel LCD interfacing with AT90S2313 MCU (figure 3b)which the autor had modify the file for AT90S2313. This file download from internet, but he forgot from which
website.he use this file to test the ponyprog software and SI-prog hardware programmer.[more]
Posted on 06 Mar 2008
This is a simple IR receiver circuit which plugs into a serial port of a computer. Althrought, there are many other circuits of this kind, and most of them are even simpler, but this circuit has two major advantages: (1) it uses an Atmel AVR RISC microcontroller (an AT90S2313) instead of the usual PIC microcontroller and (2) it uses a Maxim MAX232 for the generation of valid RS232 levels.[more]
Posted on 06 Mar 2008
This is a very simple version of the Direct Digital Synthesis, using just the AT90S2313 and a resistor network.It’s controlled over RS232 from a small Windows program, and can generate Sine, Sawtooth, Trangle and Sqare waves ranging from 0.07 Hz to about 200-300 kHz in 0.07 Hz steps (depending on your crystal).[more]
Posted on 13 Feb 2008
This project will create a rolling display pattern using up to 8 Light Emiting Diodes. But more importantly, this page demonstrates how to set up and run a basic program using the power ATMEL AVR development kit. This guide will explain the AVR instruction on a line-by-line basis for the best clarity.[more]
