Tag Archives: led display

Making a LED Message Display using ATmega8 and P10

This LED moving message display is four feet in length and six inches in length. Horizontally their are 128 leds and vertically 16. It can show message in English language scrolling from right to left. The system is made using four P10 led display modules and ATmega8 as microcontroller. It has PS/2 keyboard interface that is used to enter message to the board. To enter text, keyboard is connected and Esc key is pressed, this brings the device into text entry mode. After this the whole message is typed using keyboard, at the end of message Enter key is pressed, this saves the message in internal EEPROM of the ATmega8. Now the keyboard can be removed. Read more …

Interfacing Temperature Sensor – LM35

By interfacing different types of sensors with our MCU we can sense the environment and take decisions, in this way we can create "smart" applications. There are wide variety of sensors available. In this tutorial we will learn about a popular sensor LM35 which is precision centigrade temperature sensor. It can be used to measure temperature with accuracy of 0.5 degree centigrade. We can interface it easily with AVR MCUs and can create thermometers, temperature controller, fire alarms etc. Things Required   S. No. Item Image 1 28 PIN AVR Dev Board Contains the core AVR circuit including 5v regulator, reset, ISP. 2 Seven Segment Display Module Four common anode displays multiplexed with driver transistors and current limiting resistors. 3 Single Pin Female to Female Burg Wires Used to interconnect the two boards. And the sensor.   4 USB AVR Programmer To upload the program to the development board. 5 LM35 Temperature Sensor   LM35 LM35 by National Semiconductor is a popular and low cost temperature sensor. It is also easily available. You can buy one from here online. It has three pins as follows. Fig – LM35 Pin Configuration     The Vcc can be from 4V to 20V as specified by the datasheet. To use the sensor simply connect the Vcc to 5V ,GND to Ground and the […]