Rei Vilo's fischertechnik Corner
  • About
  • Blog
  • Reviews
    • How to Start?
    • Controllers >
      • Robotics TXT
      • TXT 4.0 Controller
      • Bluetooth Smart Beginner Set
      • Interface Boards for fischertechnik Models
      • Didacta Advance Pi-F5 interface board
    • Sets >
      • Technical Revolutions Set
      • Pneumatic Power Set
      • Automation Robots Set
      • Electro-Pneumatic Set
      • Starter Set for micro:bit
      • Bluetooth Smart Beginner Set
      • Robotics TXT Smart Home Set
    • Exploring the Lego World >
      • Purchasing
      • Unboxing
      • Installing
      • Building
      • Programming
      • Connecting
      • Playing
      • Expanding
      • Concluding
  • Models
    • Back to the 70's
    • Micro Models
    • New Magasin >
      • Magasin releases 1, 2 and 3
      • Long X-Axis
      • Moving Desk And Y-Axis
      • Compressed Air And Vacuum For Z-Axis
      • Pictures
      • Specifications
    • Power Saving White LED
    • Flipper with I²C LCD Panel
    • Celebrating 50 Years!
    • ft Convention 2013
    • ft Convention 2014
  • Sensors
    • Interfacing an Arduino to a Robo TX Controller >
      • Analog Interface
      • Digital Interface
      • I²C Interface
    • Standard Sensors >
      • Playing With Accelerometers
      • Proximity Sensor
      • Pressure Sensor
    • Advanced Sensors >
      • Industrial Colour Reader
      • Stepper Motor Controller
      • DC-Motor with Quadrature Encoder Controller
    • smartDevices >
      • smartColours
      • smartRFID
      • smartLED
      • smartHub
      • smartControls
      • smartMeter
      • smartCamera
      • smartNewCamera
      • smartWiFi
      • smartBLE
      • smartNode
      • smartIMU
  • RoboPro
    • Value Operations >
      • Min and Max Functions
      • Signal Management With Median
      • Modulo Function
      • Map Function
    • Standard Modules >
      • Software Managed Compressor
      • Self-Calibrated Colour-Reader
      • Standard Conveyor Belt Routine
      • Management Panel
      • Encoder-Motor Position Management
    • Variable Types >
      • CSV List Management
      • Queue Function
    • Program Structures >
      • Parallel Processing
      • Multi-Tasking End Management Procedure
    • Tutorials >
      • Setting Bluetooth LAN with Multiple TX-Cs
      • Dealing with Very Large Models >
        • Getting a General View
        • Defining User's Functions
        • Elaborating the Modelisation
        • Defining the Processes
        • Setting the Messages
        • Going Further
        • References
      • Program Error 2 Message
  • 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 >
      • I²C Real Time Clock DS1307
      • I²C LCD screen 4 lines of 20 characters LCD03
      • I²C Triple Axis Accelerometer ADXL345
      • I²C Red-Green-Blue LED BlinkM
      • I²C Two Axis Compass HMC6352
      • I²C Triple Axis Magnetometer HMC5843
      • I²C True Colour Sensor ADJD-S371
      • I²C Stepper Controller AMIS-30624
    • List of I²C Drivers for smartDevices >
      • I²C True Colours Smart Sensor smartColours
      • I²C RFID Smart Sensor smartRFID
      • I²C 4-Digit 7-Segment LED Display smartLED
      • I²C Screen With Touch and SD-Card smartControls
      • I²C Smart Sensor smartCamera
      • I²C Smart Sensor smartNewCamera
      • I²C Remote WiFi Interface smartWiFi​
      • I²C Remote Bluetooth Interface smartBLE​
      • I²C Remote Interface smartNode​
      • I²C New LCD Screen 4 x 20 characters smartLCD
      • I²C Inertial Measurement Unit smartIMU

I²C Interface 

The I²C implementation on the Robo TX controller --starting Robo Pro 3.1.3-- is easy to use, especially when an I²C driver is provided, works fine and is reliable.
• 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.
Right, the pins of the EXT2 plug of the Robo TX controller, with the safety hole on the left.
Picture
Robo Pro side
Arduino side
Sending a command is fairly basic:
Picture
Arduino receives the command:

command = Wire.read();

switch (command) {
  case 0x52: // reset
    mySensor.reset();
    Serial.print("< reset");
    Serial.println();
    break;
}
Reading data requires two steps:
  • First step sends the command or the register,
  • Second step retrieve the data.

Requesting directly the data with specifying the register or the command at the same time doesn't work with Arduino.

The two steps approach fixes this issue.
Picture
Arduino receives the command:

command = Wire.read();

switch (command) {
  case 0x56: // version
    Serial.println("< version");
    break;
}
Arduino sends the data:

switch (command) {
  case 0x56: // version
    buffer.i16[0] = 0x0208    
    Wire.write(&buffer.i8[0], 2);
    break;

}
Speed with Arduino is limited at 100 kHz.

Learn more about the I²C functions is available at How to Manage an I²C Device?

Previous

  • Digital Interface
Powered by Create your own unique website with customizable templates.