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Posts Tagged ‘AVR Microcontroller’

LCD 2 USB by Atmel AVR Mega8 CPU

LCD2USB is a open source/open hardware project. The goal of LCD2USB is to connect HD44780 based text LCD displays to various PCs via USB. LCD2USB was meant to be cheap and to be made of easily available parts. It is therefore based on the Atmel AVR Mega8 CPU and does not require any difficult to obtain parts like separate USB controllers and the like.

LCD2USB is currently supported by lcd4linux (LCD2USB support is built-in), LCD Smartie (requires a seperate driver), and LCDProc (LCD2USB support is built-in). The hardware of the LCD2USB interface consists of the Atmel AVR Mega8 CPU, a cheap and easy to obtain microcontroller with 8 KBytes flash (of which ~3k are used in this application) and 2 KBytes RAM. The processor is surrounded by few parts, mainly connectors to interface to the PC and the LCD. A power LED (LED1) indicates that the system is powered via USB. The system clock is derived from a 12Mhz crystal….

Source: http://www.harbaum.org/till/lcd2usb/index.shtml

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Categories: Circuit com, Microcontroller Tags: AVR Microcontroller, Circuit com, USB

AVR ISP Programmer by 74HCT244

This board can program an AVR microcontroler ATMEL (ATmega8, ATMega32, …) from a parallel printer LPT1 using ISP functionality In System Programming. This programming type can program and/or configure microcontroler directly on the target board without rmoving device and put it on a separate programmer. This board is compatible with programming software

AVR LCD Thermometer by LM35

The LM35 of National Semiconductors that is used in this project is a precision centigrade temperature sensor, which has an analog output voltage. It has a range of -55ºC to +150ºC and a accuracy of ±0.5ºC . The output voltage is 10mV/ºC . The output voltage is converted by the AD convertor of the AT Mega8. The temperature is displayed on an LCD module. In this example the thermometer has a range of 0ºC to 40ºC and a resolution of 0.5ºC. If you want to have a readout in Fahrenheit you can use the LM34.

Read More Source:http://www.avrprojects.net/articles.php?lng=en&pg=62

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