Updated platformio.ini file to flash previously problematic ESPs

platformio.ini

@@ -11,6 +11,16 @@
 [platformio]
 src_dir = ampel-firmware
 
+[env:esp8266-12f]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+monitor_speed = 115200
+upload_speed = 115200
+build_flags =
+    -D LED_BUILTIN=2
+    -D FLASH_MODE=DIO
+
 [env:esp8266]
 platform = espressif8266
 board = esp12e