up voltage

main.py

@@ -51,10 +51,31 @@ async def battery_monitor(aadc):
         # logger.debug("Out of range:", value)
 
         voltage = aadc.read_u16() * (3.3 / 65535)
-        logger.debug(f"Battery Voltage: {voltage}")
+
+        logger.debug(
+            f"Battery Voltage: {voltage}V, Capacity: {int(voltage_to_capacity(voltage / 2))}%"
+        )
         await asyncio.sleep_ms(5000)
 
 
+# simple voltage to capacity, model for alkaline batteries
+def voltage_to_capacity(voltage):
+    if voltage >= 1.6:
+        return 100
+    elif 1.5 <= voltage < 1.6:
+        return 90 + (voltage - 1.5) * 100
+    elif 1.4 <= voltage < 1.5:
+        return 70 + (voltage - 1.4) * 200
+    elif 1.3 <= voltage < 1.4:
+        return 40 + (voltage - 1.3) * 300
+    elif 1.2 <= voltage < 1.3:
+        return 10 + (voltage - 1.2) * 300
+    elif 1.0 <= voltage < 1.2:
+        return (voltage - 1.0) * 50
+    else:
+        return 0
+
+
 #### BLE UART  ###
 import ble_uart
 import bluetooth