Interface

'Armadillo' has a parallel interface port(called GPIO).
   *GPIO = General Purpose Inputs and Outputs

This port is connected to ARM-7 port B.
In order to control external hardwares, you shall add interface circuit.


Flat cable
I recommend you will make a flat cable.
This cable connects between 'Armadillo' GPIO and interface circuit.
I have maken the following flat cable with sokets.



 Flat cable length is about 10 cm.

 As long cable will get some noise, I recommend to use short cable.


Interface circuit
Automatic door system has two sensors and four actuators.
I have designed four inputs and four outputs circuit.

INPUTS

 Inputs consist of some resistors , LEDs and transisters.

 LEDs are indicators for human beings.

 You can recognize that input signal comes or not with LED indicator. 

OUTPUTS

 Outputs consist of some resistors , LEDs , diodes and power transisters.

 Diode does avoid to be broken by induced high voltage during switching.

 You can recognize that control signal comes or not with LED indicator. 



I have used the following parts to have easy connection and disconnection. 



 The next photo is a sample interface board.
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