Circuit Lake

The goal of project was to keep the water bowl full and keeping the dog and cat watered at all times without flooding the house. It gets its water supply from an ice maker water line. Phillip Moorman built this project based on Parallax.He built a float and water valve assembly that fits on the water bowl in place of the original 5 gallon water jug. He built what He call a logic board that consists of eight LED's, four expansion headers, and a transistor that supplies the ground for ...

The project allows you to analyze characteristics of unknown/junk battery especially the capacity and variation of the voltage on discharge. It is controlled with a PC via a serial port. No external power supply is required because it is powered by RS-232C signals. It uses ATmega48 as main controller for dummy load and constant current circuit.For measurement of battery voltage, four-wire method is used to eliminate an error due to drop out voltage at the wires and contacts. This is needed at high current and low voltage cells, such as ...

Aurora 9x18 is a beautiful firing sequence of 162 RGB-LEDs in a circular configuration. The color of each circle is controlled by a microcontroller (PIC24F08KA101) using a twisted form of PWM. The MCU only has one PWM module, yet Aurora is capable of 27 (9xR,G,B) independent brightness control.The project uses an idea of combining PWM with multiplex drive to control the LED. It broke up each PWM cycle into multiple pulses, so that multiple LEDs were lit multiple times within one PWM cycle. In this way, the average outputs of ...

This ATMega168-based battery tester allows you to find out the overall capacity of the rechargeable battery. It can shows how long will a battery last from the time it’s fully charged to the time that the “low battery” indicator comes on your device. It can be used to test multiple cells individually, and display the results on an LCD.The tester discharges the battery while monitoring the voltage of the batteries. When the low threshold is reached, that cell is done it disconnects the load from the battery. When all tests ...