Blog Archives
Posted on 29 Apr 2008
This basically the frequency meter section of the frequency meter/pulse generator based on the AT90S2313 described elsewhere on this site, combined with the 100 MHz RF interface described in the page about the RS-232 to 100 MHz RF desktop channel adapter. Built and align this is the same manner as the 100 MHz RF desktop channel adapter. The frequency meter has a maximum input frequency of 4 Mhz and counts up to 65535. Time bases of 10 ms, 100 ms, 1 second, 10 seconds, and 100 seconds are selectable from the keyboard via the RF link.[more]
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 ยตs 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]
