Improve docu and bring ESP32 pin switch (#4)

* add animation and detail images

* Update README.md

* add pin switch for ESP32 based boards

Pin 8 for ESP32, Pin 1 for Digispark

Author: designer2k2

README.md

@@ -14,7 +14,7 @@ alt="DIY XMAS TREE" width="560" height="315" border="10" /></a>
 
 1. Solder WS2812 led rings power and ground with magnet wire, tree shaped.
 2. Solder every output with the input from the next ring.
-3. Programm Digistump using Arduino IDE.
+3. Programm Digispark using Arduino IDE.
 4. Connect power and ground to Digispark.
 5. Connect the first input to Digispark pin 1.
 6. Connect Digispark to powersource.
@@ -32,5 +32,10 @@ It can be considered OSHW, i mean, how can you not recreate this easily?
 1. Use more LED´s: [93 LED Ring´s](https://www.aliexpress.com/item/1-8-12-16-24-32-Bits-WS2812-5050-RGB-LED-Ring-Lamp-Light-with-Integrated/32662512396.html?ws_ab_test=searchweb0_0,searchweb201602_4_10065_10068_10084_10083_10080_10082_10081_10060_10061_10062_10056_10055_10037_10054_10059_10032_9912_10099_10078_10079_10077_426_10103_10073_10102_10096_10052_10050_10051-10050_9912,searchweb201603_6&btsid=882d21ad-2098-4702-ae11-bcffaf4105a9) The code needs to be changed to reflect the 93 WS1812!
 2. Or even more! [241 LED Ring's](https://www.aliexpress.com/item/Addressable-WS2812B-pixel-Ring-1-8-12-16-24-32-40-48-60-93-241-LEDs/32809169128.html?spm=a2g0x.10010108.1000001.8.595e2b2dKDTtbE&isOrigTitle=true) The code needs to be adopted for this one also.
 
+Online simulation on Wokwi:  https://wokwi.com/projects/348695052670730836
 
-Made an example on Wokwi : https://wokwi.com/projects/348695052670730836
+<img src='img/xmas-tree-animation.gif'>
+
+It is also possible to use a QT PY or similar ESP32-S2 or ESP32-C3 based boards:
+
+<img src='img/digispark-attiny85.jpg'> <img src='img/qtpy-esp32s2.jpg'>

img/digispark-attiny85.jpg

@@ -14,7 +14,14 @@
 
 #include <Adafruit_NeoPixel.h>  //needed for the WS2812
 
+#if defined(ESP32)
+#pragma message "ESP32 based board, Pin 8"
+#define PIN 8          //Pin 8, A3 is DATA In on the bottom Ring
+#else
+#pragma message "AVR based board, Pin 1"
 #define PIN 1          //Pin 1 is DATA In on the bottom Ring
+#endif
+
 #define BRIGHTNESS 40  // brightness reduced (about 180mA max, 100mA average)
 #define SIZEOFARRAY(X) sizeof(X) / sizeof(X[0])