diff -r 000000000000 -r 88d965579617 main/Kconfig.projbuild
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main/Kconfig.projbuild	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,108 @@
+menu "CO2 meter configuration"
+
+    config ONE_WIRE_BUS
+	int "OneWire Bus GPIO number"
+        range 0 34
+        default 25
+        help
+                GPIO number (IOxx) to access the DS18B20 for the bottle temperature semsor.
+
+                Some GPIOs are used for other purposes (flash connections, etc.) and cannot be used.
+
+                GPIOs 35-39 are input-only so cannot be used to drive the One Wire Bus.
+
+    menu "I2C bus"
+
+        config I2C_MASTER_SCL
+            int "SCL GPIO Num"
+	    range 0 39
+            default 22
+            help
+                GPIO number for I2C Master clock line.
+
+        config I2C_MASTER_SDA
+            int "SDA GPIO Num"
+	    range 0 39
+            default 21
+            help
+                GPIO number for I2C Master data line.
+
+        config I2C_MASTER_PORT_NUM
+            int "Port Number"
+            default 0
+            help
+                Port number for I2C Master device.
+
+        config I2C_MASTER_FREQUENCY
+            int "Master Frequency"
+            default 100000
+            help
+                I2C Speed of Master device.
+
+    endmenu
+
+    menu "Rotary encoder"
+
+    config ROT_ENC_A_GPIO
+    	int "Rotary Encoder A output GPIO number"
+        range 0 39
+        default 27
+        help
+                GPIO number (IOxx) from which to sample the Rotary Encoder 'A' output.
+
+                Some GPIOs are used for other purposes (flash connections, etc.) and cannot be used.
+
+    config ROT_ENC_B_GPIO
+    	int "Rotary Encoder B output GPIO number"
+        range 0 39
+        default 26
+        help
+                GPIO number (IOxx) from which to sample the Rotary Encoder 'B' output.
+
+                Some GPIOs are used for other purposes (flash connections, etc.) and cannot be used.
+
+    config ROT_ENC_SW_GPIO
+	int "Rotary Encoder push switch GPIO number"
+	range 0 39
+	default 12
+	help
+		GPIO number (IOxx) from which to sample the Rotary Push function output and to
+		wakeup the ESP from deep sleep.
+
+		Some GPIOs are used for other purposes (flash connections, etc.) and cannot be used.
+    endmenu
+
+    menu "ADC channels"
+
+    config BATT_CHANNEL
+	int "Power monitor analog measurement channel"
+	range 4 7
+	default 4
+	help
+		The ADC1 channel to measure the half VDD voltage ladder
+
+
+    config PRESSURE_1
+	int "Pressure transducer 1"
+	range 4 7
+	default 6
+	help
+		The ADC1 channel to measure the first pressure transducer
+
+    config PRESSURE_2
+        int "Pressure transducer 2"
+        range 4 7
+        default 7
+        help
+                The ADC1 channel to measure the second pressure transducer
+
+    config PRESSURE_3
+        int "Pressure transducer 3"
+        range 4 7
+        default 5
+        help
+                The ADC1 channel to measure the third pressure transducer
+
+    endmenu
+
+endmenu