diff --git a/DCCTimerSTM32.cpp b/DCCTimerSTM32.cpp
index b26aa4d..1b96f70 100644
--- a/DCCTimerSTM32.cpp
+++ b/DCCTimerSTM32.cpp
@@ -30,13 +30,12 @@
 
 #include "DCCTimer.h"
 
-#if defined(ARDUINO_NUCLEO_F411RE)
-// STM32F411RE doesn't have Serial1 defined by default
+#if defined(ARDUINO_NUCLEO_F411RE) || defined(ARDUINO_NUCLEO_F446RE)
+// Nucleo-64 boards don't have Serial1 defined by default
 HardwareSerial Serial1(PB7, PA15);  // Rx=PB7, Tx=PA15 -- CN7 pins 17 and 21 - F411RE
 // Serial2 is defined to use USART2 by default, but is in fact used as the diag console
-// via the debugger on the Nucleo-64 STM32F411RE. It is therefore unavailable
-// for other DCC-EX uses like WiFi, DFPlayer, etc.
-// Let's define Serial6 as an additional serial port (the only other option for the F411RE)
+// via the debugger on the Nucleo-64. It is therefore unavailable for other DCC-EX uses like WiFi, DFPlayer, etc.
+// Let's define Serial6 as an additional serial port (the only other option for the Nucleo-64s)
 HardwareSerial Serial6(PA12, PA11);  // Rx=PA12, Tx=PA11 -- CN10 pins 12 and 14 - F411RE
 #elif defined(ARDUINO_BLAH_F412ZG) || defined(ARDUINO_NUCLEO_F412ZG) || defined(ARDUINO_NUCLEO_F429ZI) || defined(ARDUINO_NUCLEO_F446ZE)
 // Nucleo-144 boards don't have Serial1 defined by default
diff --git a/platformio.ini b/platformio.ini
index 5fcda00..46606b1 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -24,8 +24,8 @@ default_envs =
 	Teensy3.6
 	Teensy4.0
 	Teensy4.1
-src_dir = .
-include_dir = .
+src_dir = /Users/paul/Projects/CommandStation-EX-devel
+include_dir = /Users/paul/Projects/CommandStation-EX-devel
 
 [env]
 build_flags = -Wall -Wextra
@@ -50,19 +50,6 @@ monitor_speed = 115200
 monitor_echo = yes
 build_flags = -std=c++17
 
-; Firebox disabled for now
-; [env:samc21-firebox]
-; platform = atmelsam
-; board = firebox
-; framework = arduino
-; upload_protocol = atmel-ice
-; lib_deps = 
-;	${env.lib_deps}
-;	SparkFun External EEPROM Arduino Library
-;monitor_speed = 115200
-;monitor_echo = yes
-;build_flags = -std=c++17
-
 [env:mega2560-debug]
 platform = atmelavr
 board = megaatmega2560
@@ -109,9 +96,6 @@ lib_deps =
 	SPI
 monitor_speed = 115200
 monitor_echo = yes
-; Example, but v12 does generate bigger binaries
-; platform_packages = toolchain-atmelavr@symlink:///opt/avr-gcc-12.1.0-x64-linux
-; Should make binaries smaller
 build_flags = -mcall-prologues
 
 [env:mega328]
@@ -160,7 +144,6 @@ lib_deps =
 	SPI
 monitor_speed = 115200
 monitor_echo = yes
-; Should make binaries smaller
 build_flags = -mcall-prologues
 
 [env:nano]
@@ -188,6 +171,15 @@ build_flags = -std=c++17  -Os -g2
 monitor_speed = 115200
 monitor_echo = yes
 
+[env:Nucleo-F446RE]
+platform = ststm32
+board = nucleo_f446re
+framework = arduino
+lib_deps = ${env.lib_deps}
+build_flags = -std=c++17  -Os -g2
+monitor_speed = 115200
+monitor_echo = yes
+
 [env:Teensy3.2]
 platform = teensy
 board = teensy31
@@ -226,4 +218,5 @@ board = teensy41
 framework = arduino
 build_flags = -std=c++17  -Os -g2
 lib_deps = ${env.lib_deps}
-lib_ignore =
\ No newline at end of file
+lib_ignore = 
+