Outline

This is a fork of the original repo at: https://github.com/DFRobot/DFRobot_LedDisplayModule

There where some compatibility issues with compiling through PlatformIO for STM32 C++ environments. There are some only minor code changes to get around a handful of compile errors such as

error: invalid conversion from 'int' to 'const char*' [-fpermissive]

ISO C++ forbids comparison between pointer and integer [-fpermissive]

DFRobot_LedDisplayModule

This is a 4bits / 8bits digital tube. It communicates with the host via IIC to show numbers from 0 to 9, capital letters A, B, C, D, E, F, H, L, O, P, U and dash-.
The IIC address of 4 bits digital tube in default is 0x48.
The IIC address of 8 bits digital tube in default is 0xE0. This address can be changed to 0xE2, 0xE4, 0xE6 with different combinations of 2 welding points that in the back of the display.

DFRobot_LedDisplayModule for Arduino

---

Provide an Arduino library for the Led Display Module.

Table of Contents

• Summary
• Installation
• Methods
• Compatibility
• History
• Credits

Summary

This is an Arduino IDE library to help realize the communication between the 4bits/8bits digital tube and Arduino
The library ease the control of display by IIC

Installation

To use this library, please download the library file first and paste it into the \Arduino\libraries directory, then open the examples folder and run the demo in the folder.

Methods

  int begin4();
  
  /*!
   *  @brief Initialize the 8bits 
   *  @return Return 0 if initialization succeeds, otherwise return non-zero.
   */ 
  int begin8();

  /*!
   *  @brief Start display
   *  @param Command to start display
   */
  void displayOn();
  
  /*!
   *  @brief End display
   *  @param Command to end displaying
   */  
  void displayOff();

  /*!
   *  @brief Flash mode of the 8 bits digital tube, flash at 0.5Hz
   *  @param IIC flash command
   */
  void flashTwos();
  
  /*!
   *  @brief Flash mode of the 8 bits digital tube, flash at 1HZ
   *  @param IIC flash command
   */
  void flashOnes();
  
  /*!
   *  @brief Flash mode of the 8 bits digital tube, flash at 2HZ 
   *  @param IIC flash command
   */
  void flashHalfs();
  
  /*!
   *  @brief The 8 bits digital tube stops flash 
   *  @param IIC command to stop flash
   */
  void stopFlash();

  /*!
   *  @brief Set brightness of the 4 bits digital tube
   *  @param The brightness value can be set to numbers 1~8
   */
  void setBrightness4(int brightnessValue); 
  
  /*!
   *  @brief Set brightness of the 8 bits digital tube
   *  @param The brightness value can be set to numbers 1~16
   */
  void setBrightness8(int brightnessValue);

  /*!
   *  @brief Display area of the 4bits digital tube 
   *  @param The display address of the first bit to fourth bit could be numbers 1~4
   */
  void setDisplayArea4(int areaData);
  void setDisplayArea4(int areaData1,int areaData2);
  void setDisplayArea4(int areaData1,int areaData2,int areaData3);
  void setDisplayArea4(int areaData1,int areaData2,int areaData3,int areaData4);

  /*!
   *  @brief Display area of the 8bits digital tube
   *  @param The display address of the first bit to eighth bit could be numbers 1~8
   */
  void setDisplayArea8(int areaData);
  void setDisplayArea8(int areaData1,int areaData2);
  void setDisplayArea8(int areaData1,int areaData2,int areaData3);
  void setDisplayArea8(int areaData1,int areaData2,int areaData3,int areaData4);
  void setDisplayArea8(int areaData1,int areaData2,int areaData3,int areaData4,int areaData5);
  void setDisplayArea8(int areaData1,int areaData2,int areaData3,int areaData4,int areaData5,int areaData6);
  void setDisplayArea8(int areaData1,int areaData2,int areaData3,int areaData4,int areaData5,int areaData6,int areaData7);
  void setDisplayArea8(int areaData1,int areaData2,int areaData3,int areaData4,int areaData5,int areaData6,int areaData7,int areaData8);

  /*!
   *  @brief Print data of the 4 bits digital tube
   *  @param It could be both integer and decimal
   */  
  void print4(double sensorData);
  
  /*!
   *  @brief Print data of the 4 bits digital tube
   *  @param Displayed data of bit 1 to bit 4 could be the numbers 0 to 9, capital letters A, B, C, D, E, F, H, L, O, P, U and dash-. 
   *  @n and also could be decimal points, such as "0." "9." "A." "-."
   */
  void print4(const char buf1[]);
  void print4(const char buf1[],const char buf2[]);
  void print4(const char buf1[],const char buf2[],const char buf3[]);
  void print4(const char buf1[],const char buf2[],const char buf3[],const char buf4[]);

  /*!
   *  @brief Print data of the 8 bits digital tube
   *  @param It could be both integer and decimal
   */
  void print8(double sensorData);
  
  /*!
   *  @brief Print data of the 8 bits digital tube
   *  @param Displayed data of bit 1 to bit 8 could be the numbers 0 to 9, capital letters A, B, C, D, E, F, H, L, O, P, U and dash-.
   *  @n and also could be decimal points, such as "0." "9." "A." "-."
   */
  void print8(const char buf1[]);
  void print8(const char buf1[],const char buf2[]);
  void print8(const char buf1[],const char buf2[],const char buf3[]);
  void print8(const char buf1[],const char buf2[],const char buf3[],const char buf4[]);
  void print8(const char buf1[],const char buf2[],const char buf3[],const char buf4[],const char buf5[]);
  void print8(const char buf1[],const char buf2[],const char buf3[],const char buf4[],const char buf5[],const char buf6[]);
  void print8(const char buf1[],const char buf2[],const char buf3[],const char buf4[],const char buf5[],const char buf6[],const char buf7[]);
  void print8(const char buf1[],const char buf2[],const char buf3[],const char buf4[],const char buf5[],const char buf6[],const char buf7[],const char buf8[]);

Compatibility

MCU	Work Well	Work Wrong	Untested	Remarks
Arduino Uno	√
Mega2560	√
Leonardo	√
ESP32	√
micro:bit	√

History

• Data 2019-12-10
• Version V1.0

Credits

Written by(wenzheng.wang@dfrobot.com), 2019. (Welcome to our website)