3-color e-paper displays

ConnectingHardware.md

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+#### GxEPD2_AVR: a simple E-Paper display library for Arduino for SPI e-paper display panels from Dalian Good Display and SPI e-paper display boards from Waveshare
+
+#### important note :
+#### - these displays are for 3.3V supply and 3.3V data lines
+#### - never connect data lines directly to 5V Arduino data pins, you may use e.g. 4k7 series resistor
+#### - do not forget to connect GND
+
+## mapping suggestions
+
+#### mapping suggestion from Waveshare SPI e-Paper to Wemos D1 mini
+##### - BUSY -> D2, RST -> D4, DC -> D3, CS -> D8, CLK -> D5, DIN -> D7, GND -> GND, 3.3V -> 3.3V
+
+#### mapping suggestion from Waveshare SPI e-Paper to generic ESP8266
+##### - BUSY -> GPIO4, RST -> GPIO2, DC -> GPIO0, CS -> GPIO15, CLK -> GPIO14, DIN -> GPIO13, GND -> GND, 3.3V -> 3.3V
+
+#### mapping suggestion for ESP32, e.g. LOLIN32, see .../variants/.../pins_arduino.h for your board
+##### - NOTE: there are variants with different pins for SPI ! CHECK SPI PINS OF YOUR BOARD
+##### - BUSY -> 4, RST -> 16, DC -> 17, CS -> SS(5), CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V
+
+#### mapping suggestion for STM32F1, e.g. STM32F103C8T6 "BluePill"
+##### - BUSY -> A1, RST -> A2, DC -> A3, CS-> A4, CLK -> A5, DIN -> A7
+
+#### mapping suggestion for AVR, UNO, NANO etc.
+##### - BUSY -> 7, RST -> 9, DC -> 8, CS-> 10, CLK -> 13, DIN -> 11
+
+## connection scheme for DESTM32-S2 connection board for e-paper panels:
+
+```
+   connection to the e-Paper display is through DESTM32-S2 connection board, available from Good Display
+
+
+
+   DESTM32-S2 pinout (top, component side view):
+
+         |-------------------------------------------------
+
+         |  VCC  |o o| VCC 5V  not needed
+
+         |  GND  |o o| GND     GND
+
+         |  3.3  |o o| 3.3     3.3V
+
+         |  nc   |o o| nc
+
+         |  nc   |o o| nc
+
+         |  nc   |o o| nc
+
+   MOSI  |  DIN  |o o| CLK     SCK
+
+   SS    |  CS   |o o| DC      e.g. D3
+
+   D4    |  RST  |o o| BUSY    e.g. D2
+
+         |  nc   |o o| BS      GND
+
+         |-------------------------------------------------
+
+```