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.

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.

Finalised and Working Sensor

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