Add energy monitor using riemann sum algorithm.

esphome/lab-ble-proxy.yaml

@@ -326,6 +326,7 @@ display:
         id(atorch_current).has_state() ? id(atorch_current).state : NAN,
         id(atorch_power).has_state() ? id(atorch_power).state : NAN,
         id(atorch_capacity).has_state() ? id(atorch_capacity).state : NAN,
+        id(atorch_energy_calculated).has_state() ? id(atorch_energy_calculated).state : NAN,
         id(atorch_temperature).has_state() ? id(atorch_temperature).state : NAN
       );
 
@@ -480,6 +481,19 @@ sensor:
       name: "${friendly_name} Atorch Dim Backlight"
       id: atorch_dim_backlight
 
+  - platform: integration
+    name: "${friendly_name} Atorch Energy"
+    id: atorch_energy_calculated
+    sensor: atorch_power
+    time_unit: h
+    unit_of_measurement: "Wh"
+    icon: "mdi:lightning-bolt"
+    device_class: energy
+    state_class: total_increasing
+    accuracy_decimals: 3
+    restore: true
+    integration_method: trapezoid
+
 text_sensor:
   - platform: template
     name: "${friendly_name} OWON Reading"