Fun with Arduino

Posted on Feb 5, 2014

The term Arduino actually refers to a system of components that include the board, the microcontroller, the boot-loader, and the programming environment. It is a system designed to `protect` the user from a lot of the complication that is part of microcontroller programming. At the heart of the Arduino board is a microcontroller called the ATMEGA3

Fun with Arduino
Click here to download the full size of the above Circuit.

28P. The Arduino board acts like a space suit for the ATMEGA, providing life support and doing its best to protect the chip from damage. At the end of the day, the Arduino is a development board. While you can make the Ardino a permanent part of you project, once you have finished with the development phase of your design, it is often cleaner and less expensive to replace it with a stand alone ATMEGA microcontroller circuit. This is what we are going to build. The Arduino board has built in power regulation circuitry that provides a steady 5 Volts to the ATMEGA328P. But, since the Arduino is going bye-bye, we have to build our own power supply circuit. We also need to provide a clock source for the microcontroller. The 16Mhz crystal and 22pF capacitors take care of that. Let`s look at what this circuit is doing. The 9 volt power from your adapter is being fed to a 1N4001 diode. This diode will only allow current to pass in one direction so if the adapter is connected backwards, the circuit will be protected. The 7805 regulator then drops the voltage down to 5 volts and holds it there. The 10uF and 100uF smooth out any ripples in the 5 volt supply. This steady 5 volt power is supplied to the ATMEGA328P chip. The 16Mhz crystal and 22pf capacitors supply a steady clock signal to the microcontroller. Finally, in 10K resistor holds the microcontrollers `reset` pin high, so the chip will run it`s program. It`s a very simple...

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