Circuit Lake

Electronic Project and Circuit Collection

AVR Related Resources


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 […]

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 […]

Lead-Acid Battery Tester, Desulfator & Charger

April 01, 2013 By: admin Category: AVR, Power Supply, Tools No Comments →

Batery tester and charger

Da Pimp is ATmega48-based portable Lead-acid battery tester, desulfator & charger designed by Mikey Sklar. It uses capacitors instead of a transformer for efficient conversion of AC to DC voltages. With input 120VAC, it will deliver 0.5A constant current output and dynamic voltage 1VDC – 100VDC. While 220VAC input will increase its current output to […]