HT1621 7 segment LCD Arduino library

Arduino library for 7-segment lcds based on the HT1621 driver. Very often marked as PDC-6X1.

Based on the bitbanging efforts by anxzhu (2016-2018).
APIs rewritten in 2018 to follow the LiquidCrystal format by valerio\new.

APIs reference

• void begin(int cs_p, int wr_p, int data_p,[int backlight_p])
  Starts the lcd with the pin assignement declared. The backlight pin is optional

• void clear()
  Clears the display

• void backlight()
  Turns on the backlight

• void noBacklight()
  Turns off the backlight

• void setBatteryLevel(int level)
  Accepts values from 0 to 3. Smaller values will be treated like 0, bigger values will be treated as 3. 0 turns off the battery symbol. Values from 1 to 3 will be represented by the rectangles above the battery symbol.

• void print(long num)
  Prints a signed integer between -99999 and 999999. Larger and smaller values will be displayed as -99999 and 999999

• void print(float num)
  Prints a float with 3 decimals.

• void print(float num, int precision)
  Prints a float with 0 to 3 decimals, based on the precision parameter.

• void noDisplay()
  Turns off the display (doesn't turn off the backlight)

• void display()
  Turns the display back on after it has been disabled by noDisplay()

Internal functioning

° -> 0x33 = 10 + 20 + 01 + 02
C -> 0x1D = 10 + 01 + 04 + 08

  ___10___
 |        |
 01       20
 |___02___|
 |        |
 04       40
 |___08___|