diff --git a/esp32/.gitignore b/esp32/.gitignore
index 97721ae..a62a7d9 100644
--- a/esp32/.gitignore
+++ b/esp32/.gitignore
@@ -4,3 +4,4 @@
 .vscode/launch.json
 .vscode/ipch
 doc/
+custom_platformio.ini
diff --git a/esp32/custom_platformio.ini.example b/esp32/custom_platformio.ini.example
new file mode 100644
index 0000000..df8c67a
--- /dev/null
+++ b/esp32/custom_platformio.ini.example
@@ -0,0 +1,17 @@
+[env:esp32doit-devkit-v1]
+platform = espressif32
+board = esp32doit-devkit-v1
+framework = arduino
+build_flags = -DPIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY
+board_build.partitions = defaultWithSmallerSpiffs.csv
+
+extra_configs = custom_platformio.ini
+
+; the latest development brankitchen-lightch (convention V3.0.x) 
+lib_deps = ArduinoJson@6.16.1
+            https://github.com/homieiot/homie-esp8266.git#v3.0
+            OneWire
+            DallasTemperature
+
+; add additional parameter, like the upload port
+upload_port=/dev/ttyUSB1
diff --git a/esp32/platformio.ini b/esp32/platformio.ini
index dc5fa2b..8016989 100644
--- a/esp32/platformio.ini
+++ b/esp32/platformio.ini
@@ -15,10 +15,12 @@ framework = arduino
 build_flags = -DPIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY
 board_build.partitions = defaultWithSmallerSpiffs.csv
 
-upload_port=/dev/ttyUSB0
-
 ; the latest development brankitchen-lightch (convention V3.0.x) 
 lib_deps = ArduinoJson@6.16.1
             https://github.com/homieiot/homie-esp8266.git#v3.0
             OneWire
             DallasTemperature
+
+[platformio]
+
+extra_configs = custom_platformio.ini
\ No newline at end of file