Rei Vilo's fischertechnik Corner
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  • Sensors
    • Interfacing an Arduino to a Robo TX Controller >
      • Analog Interface
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  • I²C
    • How to Connect an I²C Device to the Robo TX?
    • How to Connect an I²C Device to the Robotics TXT?
    • How to Manage an I²C Device?
    • How to Use an I²C Driver?
    • List of I²C Drivers for Sensors >
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    • List of I²C Drivers for smartDevices >
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      • I²C Inertial Measurement Unit smartIMU

Digital Interface

The digital interface is very close to the previous analog interface except we are dealing with only two values, 0 or 1, and two channels. Thus we have four possibilities. 

The circuit is based on an opto-isolator: the input powers a LED, which light is captured a photo-transistor that triggers the output (reference).
Picture

On the Arduino Side

On the left, the connection to the Arduino.
On the right, the connection to the Robo TX controller.

Because there are two channels, 4 different values could be transferred:
  • 00 or 0
  • 01 or 1
  • 10 or 2
  • 11 or 3
Picture
The Arduino program is fairly basic and explores the 4 values. 

Note the LED on pin 13 as witness.
Picture

On the Robo TX Side

• WARNING AND DISCLAIMER
This sensor is not part of the fischertechnik system.
Bad connection could damage your TX controller.
Take appropriate precautions.
You do it at your own risks.
The main program relies on two inputs, i1 and i2, both digital 10V. 

The main program reads the two digital inputs i1 and i2 and lights on lamps m1 and m2 accordingly, offering the 4 possibilities:

Picture
Picture

Possible Applications

The Arduino can read advanced sensors, process the data and send the result as a digital value to the TX controller.

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  • Analog Interface

Next

  • I²C Interface
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