HT1621 7 segment LCD Arduino library for ESP32

Note: This library has hot fixes for correct work with ESP32.

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()

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

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