config: disable battery monitoring by default and clean up ADC settings

- Set CONFIG_MONITORING_BATTERY_ENABLE to n by default
- Update help text for ADC pin configuration in Kconfig
- Remove unused config options

boards/sdkconfig.base_defaults

@@ -603,23 +603,6 @@ CONFIG_LED_EXTERNAL_PWM_FREQ=5000
 CONFIG_LED_EXTERNAL_PWM_DUTY_CYCLE=100
 # end of OpenIris: LED Configuration
 
-#
-# OpenIris: Monitoring
-#
-CONFIG_MONITORING_LED_CURRENT=y
-CONFIG_MONITORING_LED_ADC_GPIO=3
-CONFIG_MONITORING_LED_GAIN=11
-CONFIG_MONITORING_LED_SHUNT_MILLIOHM=22000
-CONFIG_MONITORING_LED_SAMPLES=10
-CONFIG_MONITORING_LED_INTERVAL_MS=500
-CONFIG_MONITORING_BATTERY_ENABLE=y
-CONFIG_MONITORING_BATTERY_ADC_GPIO=1
-CONFIG_MONITORING_BATTERY_DIVIDER_R_TOP_OHM=10000
-CONFIG_MONITORING_BATTERY_DIVIDER_R_BOTTOM_OHM=10000
-CONFIG_MONITORING_BATTERY_SAMPLES=10
-CONFIG_MONITORING_BATTERY_INTERVAL_MS=1000
-# end of OpenIris: Monitoring
-
 #
 # Camera sensor pinout configuration
 #

main/Kconfig.projbuild

@@ -204,7 +204,9 @@ menu "OpenIris: Monitoring"
         range 0 48
         default 3
         help
-            GPIO connected to the current sense input (ADC1 on ESP32-S3: 1..10 supported).
+            GPIO connected to the current sense input. On ESP32-S3 ADC1 channels
+            0..9 map to GPIO1..10; On ESP32 ADC1 channels 0..3 map to GPIO36..39,
+            channels 4..7 map to GPIO32..35; adjust if your board uses a different pin.
 
     config MONITORING_LED_GAIN
         int "Analog front-end gain/divider"
@@ -240,7 +242,7 @@ menu "OpenIris: Monitoring"
 
     config MONITORING_BATTERY_ENABLE
         bool "Enable battery voltage monitoring"
-        default y
+        default n
         help
             Enables an ADC-based readout of the lithium battery voltage so the software
             can report remaining charge in commands or REST endpoints.
@@ -252,7 +254,8 @@ menu "OpenIris: Monitoring"
         default 1
         help
             GPIO that is wired to the battery sense divider. On ESP32-S3 ADC1 channels
-            1..10 map to GPIO1..10; adjust if your board uses a different pin.
+            0..9 map to GPIO1..10; On ESP32 ADC1 channels 0..3 map to GPIO36..39;
+            channels 4..7 map to GPIO32..35; adjust if your board uses a different pin.
 
     config MONITORING_BATTERY_DIVIDER_R_TOP_OHM
         int "Battery divider top resistor (ohms)"