Circuit Lake

by Ibrahim Kamal

This Project shows you how to build a small, cheap and simple frequency meter, without any fancy, out of reach components. The simple proposed design can measure frequencies up to 40 Mhz with errors below 1%! This degree of precision will be more than enough to debug most of your analog and digital circuits, and will give you the ability to analyze many aspects that you were unable to see before. The design is built on a ATMEGA16 micro controller. There are no crystal oscillators, as we are using the internal RC oscillator, calibrated to 8 MHz. To programming the AVR microcontroller it used C code which is compiled with winAVR.

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Do you want to modify your Espresso machine for low cost and more control? well, you can try what Nash Lincoln did. Modding the Gaggia Espresso with Adding a PID temperature controller and computer interface.

The goal of this project is to create a computer interface for my Gaggia Espresso machine replacing the factory thermal switches with a PID controller and the “steam” and “pump” toggle switches with a LCD/button menu system. This project use Arduino Decimillia micro-controller which utilizes the AVR AtMega168
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This is a mini inexpensive AVR Digital Voltmeter Project with three digit display. It has also general purpose digital IO pins. So, you could use it as well to read a digital sensor and display the value.

The project can be freely programmed, calibrated and even be programmed with a non linear formula. It’s a display where you can define the relation between the measured value and the displayed number.

Interesting to build it ?
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The AVR robot controller (ARC 1.1) was designed as the base controller for a high school Mini-Sumo robot project. The controller is built around the powerful Atmel ATMEGA16 processor with 16kb of memory running at 8 MHz for an 8 mip processing speed (contrast this with a 20 MHz PIC which has a 3-4 mip equivalent speed or an 8mhz HC11 with about 1/2 mip equivalent speed). A 16 MHz crystal is included to allow doubling of the CPU speed. Pin compatible upgrades are available that double the memory.

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