ATmegaOnDIN < Projects

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---+ ATmega on DIN Rail

The need for this module came from the [[EnergyCounter][Energy Counter project]] where a board with a micro-controller with a generic I/O interface (non-isolated) was needed. Some brief search on the Internet didn't show anything as simple as what I need for this project. My requirements were very basic and these are the features of this module:
   * Micro-controller based module - !ATMEGA88A-AUR 
   * Compact solution - width equivalent to a power breaker - 17.5mm
   * Direct access to the micro-controller GPIOs - Up to 16 GPIOs available
   * Front-panel with:
      * Power status LED - Green
      * Buzzer
      * Controllable LED - Red
      * Push-button
   * Powered by 24V
   * ESD protection on each GPIO
   * Connection for AVR ISP
   * SPI-like connection for [[DebugDisplay][Debug Display board]]
   * 10MHz Xtal oscillator
   * Power supply monitoring and reset generation 
   * Reset push-button

The figure below shows the high-level architecture of the ATmegaOnDIN module. ESD protections are not shown.

<img src="%ATTACHURLPATH%/ATmegaOnDIN_2.jpg"/>

This modules required up to 20 connections in just 3 cm<sup>2</sup> and this required a very compact connector. %BR%
It uses connectors with 2.5mm pitch with push-in spring connection:

<img src="%ATTACHURLPATH%/1793789-40.jpg" />

Each position can connect to solid wires with section between 0.14 mm<sup>2</sup> and 0.5 mm<sup>2</sup> or flexible connectors with section between 0.2 mm<sup>2</sup> and 0.5 mm<sup>2</sup> or between 24 and 20 AWG. %BR%

---++ Version 1

The first version of the module was originally used for [[EnergyCounter][Energy Counter project]]:

<img src="%PUBURLPATH%/%WEB%/EnergyCounter/ATmegaOnDIN_1.jpg" />

This version has a small mechanical conflict with the solid top of the DIN rail module which needed to be cut out.

---++ Version 2

The second version of this module was created to correct/improve the module mechanics. %BR%
In the picture below the two versions of the modules can be seen together. In the one on the left (not fully assembled) the solid top on the front plate was kept.

<img src="%ATTACHURLPATH%/20150617_012116.jpg"/>

This version of the ATmegaOnDIN also changed the microcontroller ports connected to the interface. The objective was to have PC0..PC3 pins connected in order to have more ADC inputs available.
Topic revision: r4 - 2015-06-19 - PedroMaiaAlves