feat: Add INA219 battery sensor

documentation/builders/components/power/batterymonitor.md

@@ -1,14 +1,13 @@
-# Battery Monitor based on a ADS1015
-
 > [!CAUTION]
 > Lithium and other batteries are dangerous and must be treated with care.
 > Rechargeable Lithium Ion batteries are potentially hazardous and can
-> present a serious **FIRE HAZARD** if damaged, defective or improperly used.
-> Do not use this circuit to a lithium ion battery without expertise and
-> training in handling and use of batteries of this type.
+> present a serious **FIRE HAZARD** if damaged, defective, or improperly used.
+> Do not use this circuit for a lithium-ion battery without the expertise and
+> training in handling and using batteries of this type.
 > Use appropriate test equipment and safety protocols during development.
-> There is no warranty, this may not work as expected or at all!
+> There is no warranty, this may not work as expected!
 
+# Battery Monitor based on a ADS1015
 The script in [src/jukebox/components/battery_monitor/batt_mon_i2c_ads1015/\_\_init\_\_.py](../../../../src/jukebox/components/battery_monitor/batt_mon_i2c_ads1015/__init__.py) is intended to read out the voltage of a single Cell LiIon Battery using a [CY-ADS1015 Board](https://www.adafruit.com/product/1083):
 
 ```text
@@ -31,3 +30,51 @@
 >
 > * the circuit is constantly draining the battery! (leak current up to: 2.1µA)
 > * the time between sample needs to be a minimum 1sec with this high impedance voltage divider don't use the continuous conversion method!
+
+# Battery Monitor based on an INA219
+
+The script in [src/jukebox/components/battery_monitor/batt_mon_i2c_ina219/\_\_init\_\_.py](../../../../src/jukebox/components/battery_monitor/batt_mon_i2c_ina219/__init__.py) is intended to read out the voltage of a single cell or multiple LiIon Battery using a [INA219 Board](https://www.adafruit.com/product/904):
+
+```text
+                                                  3.3V
+                                                   +
+                                                   |
+                                              .----o----.
+                                              |         |  SDA
+              .-------------------------------o AIN     o------
+              |                               | INA219  |  SCL
+              |                    .----------o AOUT    o------
+             ---                   |          |         |
+     Battery  -           Regulator + Raspi   '----o----'
+     2.9V-4.2V|                    |               |
+              |                    |               |
+             ===                  ===             ===
+```
+
+# Configuration example
+
+The battery monitoring is configured in the jukebox.yml file.
+
+The "battmon" module has to be added to the modules setting. 
+
+```text
+modules:
+  named:
+    # Do not change the order!
+    publishing: publishing
+    ...
+    battmon: battery_monitor.batt_mon_i2c_ina219
+```
+The battmon module needs further configuration:
+
+```text
+battmon:
+  scale_to_phy_num: 1
+  scale_to_phy_denom: 0
+  warning_action:
+  all_clear_action:
+```
+
+The setting "scale_to_phy_denom" does not influence the INA219. However, the scale can be adjusted to fit multiple LiIon cells.
+
+

src/jukebox/components/battery_monitor/batt_mon_i2c_ina219/__init__.py

@@ -0,0 +1,56 @@
+# RPi-Jukebox-RFID Version 3
+# Copyright (c) See file LICENSE in project root folder
+
+import logging
+import jukebox.plugs as plugs
+import jukebox.cfghandler
+from ina219 import INA219
+from ina219 import DeviceRangeError
+from components.battery_monitor import BatteryMonitorBase
+
+logger = logging.getLogger('jb.battmon.ina219')
+
+batt_mon = None
+
+
+class battmon_ina219(BatteryMonitorBase.BattmonBase):
+    '''Battery Monitor based on a INA219
+
+    See [Battery Monitor documentation](../../builders/components/power/batterymonitor.md)
+    '''
+
+    def __init__(self, cfg):
+        super().__init__(cfg, logger)
+
+    def init_batt_mon_hw(self, num: float, denom: float) -> None:
+        try:
+            self.adc = INA219(float(num) / 1000, busnum=1)
+            self.adc.configure(self.adc.RANGE_16V, self.adc.GAIN_AUTO, self.adc.ADC_32SAMP, self.adc.ADC_32SAMP)
+        except DeviceRangeError as e:
+            logger.error(f"Device range error: {e}")
+            raise
+        except Exception as e:
+            logger.error(f"Failed to initialize INA219: {e}")
+            raise
+
+    def get_batt_voltage(self) -> int:
+        try:
+            batt_voltage_mV = self.adc.supply_voltage() * 1000.0
+            return int(batt_voltage_mV)
+        except Exception as e:
+            logger.error(f"Failed to get supply voltage from INA219: {e}")
+            raise
+
+
+@plugs.finalize
+def finalize():
+    global batt_mon
+    cfg = jukebox.cfghandler.get_handler('jukebox')
+    batt_mon = battmon_ina219(cfg)
+    plugs.register(batt_mon, name='batt_mon')
+
+
+@plugs.atexit
+def atexit(**ignored_kwargs):
+    global batt_mon
+    batt_mon.status_thread.cancel()