![]() ![]() The trick with this few CPU I/O pins will be to have a very flexible pin jumpers arrangement. We will work with this (simple) CPU and use it to interface I/O ports and interrupts on the S100 bus as well as interfacing with Arduino "Shields". The chip takes a 16 MHz Oscillator and runs at 3.3V or 5V, (we will use 5V). These I/O pins account for 20 of the pins. It has 14 digital I/O pins, of which 6 can be used as PWM outputs and 6 analog input pins. The Atmega328 has 32K of flash program memory and 2K of Internal SRAM. We will build a board based on the Arduino UNO board first and then later reconfigure it for the MEGA 2560 CPU as well. For maximum flexibility you might consider building two boards. That said, the UNO setup is simpler to configure, if you mainly wish to use Arduino Shields you might just stick with that setup. Because of the large number of pin connections/jumpers that would be required you cannot go back from a MEGA to UNO setup. It is however possible to start with a 328/UNO configuration and later remove that chip and go to a 2568/MEGA configuration. Because the Atmega 2560 CPU is a surface mount chip, once it is installed on the board there is no way of going back to using the 328 CPU (without desoldering the 2560 chip from the board). The first thing you have to decide is which CPU you would like the board to be setup and configured for. Please note: this board can be driven by either the Atmega 328 or Atmega 2560 CPU chip but not both CPU's at the same time. In order to use and understand this S100 bus Atmega 328/2560 CPU board you should be fairly familiar with the Arduino hardware and software.Įxcellent vendors with much information about Arduino boards are " SparkFun.COM" and " Adfruit.COM" and of course Arduino itself. Here for a pinout diagram of the Arduino MEGA board. See here for a pinout diagram for the UNO pinout and The MEGA is somewhat similar but has more I/O pins. ![]() Two very popular boards are the Arduino "UNO" board and "MEGA".īy far the most popular "Shields" pinout is that found on the UNO. Arduino also provides a nice integrated development environment (IDE) for writing simple "sketch" code. The microcontrollers are typically programmed using a serial communications interfaces, including (USB) on some models. They are usually equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards (shields) and other circuits. Arduino board designs use a variety of microprocessors. Arduino boards are available commercially in preassembled form, or as do-it-yourself kits. The project's products are distributed as open-source hardware and software. Arduino is an open source computer hardware and software (Italian) company that designs and manufactures CPU board kits for the control A whole world of new hobbyists have in the past decade grown up around the "Arduino" boards.
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