Circuit Lake

Electronic Project and Circuit Collection

AVR


Interfacing 8 LCD Displays to Microcontroller with Only Two Wires

June 13, 2013 By: admin Category: AVR, Display, Interfacing No Comments →

control 8 LCD using I2C

If you have electronics project that need many LCD display with limited MCU IO pin out, you can use this method to accomplish it. Jesus Echavarria has successfully interface 8 LCD displays and 24 Leds with only two wires: SDA and SCL from an I2C bus. The project uses MCP23017 (16-Bit I/O Expander with Serial […]

Digital Thermometer for Car, DS18S20

May 28, 2013 By: admin Category: AVR, Measurement, Monitoring No Comments →

outside temperature indicator for car

This digital thermometer is built as additional feature for car without outside temperature indicator. The project is built based on Attiny2313 microcontroller and DS18S20, 1 Wire Parasite-Power Digital Thermometer sensor from Maxim.


Completely Auto-Shutoff Circuit, ATtiny85

May 02, 2013 By: admin Category: AVR, Timer No Comments →

MCU based auto power off for battery powered device

Auto power off is must have feature for battery powered device to help extend battery life. These days, many modern battery powered devices has an automatic power off function. But, if you have battery driven device with no auto-shutoff you can add auto power off using simple circuit designed by Kyle Wengenroth below.

ATtiny2313 Frequency Meter

April 04, 2013 By: admin Category: AVR, Display, Measurement, Project No Comments →

Frequency Meter using ATtiny2313

The project shows you how to build simple and powerful frequency meter using ATtiny2313 microcontroller. The frequency meter can be used to measure frequencies from 1Hz to 10MHz (9,999,999 Hz) with a resolution of 1 Hz over the entire range. It displays result on seven 7-segment LED displays. The project uses 22.1184MHz overclocking crystal to […]