Rei Vilo's fischertechnik Corner
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  • Sensors
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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 >
      • 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

smartLED

The smartLED is a 4-digit 7-segment display encased in a 9V red battery box (references 32263 and 32958). 

It is connected to the TX controller through I²C.

The 9V red battery box makes it perfect to be included in a fischertechnik model.
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Commands

The command begin initialises the display and the command clear switches all segments off.

The value sent to the display can be decimal —range 0000~9999— or hexadecimal —range 0x0000~0xffff.

A decimal point can be defined and leading zeroes omitted. 00.12 is displayed as  0.12, with the first zero omitted.

A specific command defines the segments to light on for a given digit, based on the binary coding of the segments:
  • bit 0 = 2^0 = 1 = 0x01 for segment a
  • bit 1 = 2^1 = 2 = 0x02 for segment b
  • bit 2 = 2^2 = 4 = 0x04 for segment c
  • bit 3 = 2^3 = 8 = 0x08 for segment d
  • bit 4 = 2^4 = 16 = 0x10 for segment e
  • bit 5 = 2^5 = 32 = 0x20 for segment f
  • bit 6 = 2^6 = 64 = 0x40 for segment g
  • bit 7 = 2^7 = 128 = 0x80 for the decimal point or for the column between hours or minutes, depending on the display

For example, 
  • Displaying a capital A requires lighting the segments a, b, c, e, f and g. Adding a + b + c + e + f + g = 1 + 2 + 4 + 16 + 32 + 64 gives 119 or 0x77.
  • Displaying the minus sign only requires the g segment, thus 64 = 0x40.

The I²C 4-Digit 7-Segment LED DIsplay smartLED page provides more details about the commands and the RoboPro visual interface.
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Finalised and Working Sensor

Thanks to the previously developed sensors, only one proof of concept was needed before the first batch.
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