Removed 2 unneeded values from HA reporting, fixed mV reporting value

esphome/owon-b35t.yaml

@@ -268,22 +268,6 @@ sensor:
     name: "${friendly_name} WiFi Signal"
     update_interval: 60s
 
-  - platform: template
-    name: "${friendly_name} Display Value"
-    id: owon_display_value
-    accuracy_decimals: 6
-    update_interval: 2s
-    lambda: |-
-      return owon_meter.has_reading && !owon_meter.overload ? owon_meter.value() : NAN;
-
-  - platform: template
-    name: "${friendly_name} Base Value"
-    id: owon_base_value
-    accuracy_decimals: 9
-    update_interval: 2s
-    lambda: |-
-      return owon_meter.has_reading && !owon_meter.overload ? owon_meter.value_base() : NAN;
-
 text_sensor:
   - platform: template
     name: "${friendly_name} Reading"

esphome/owon_b35t.h

@@ -277,6 +277,19 @@ class Meter {
 
   float calc_display_value_() const {
     if (this->overload) return NAN;
+
+    if (this->is_plus) {
+      uint16_t pair1 = static_cast<uint16_t>(this->raw_[0]) | (static_cast<uint16_t>(this->raw_[1]) << 8);
+      uint8_t decimal = pair1 & 0x07;
+      if (decimal >= 7) return NAN;
+
+      uint16_t pair3 = static_cast<uint16_t>(this->raw_[4]) | (static_cast<uint16_t>(this->raw_[5]) << 8);
+      bool negative = pair3 >= 0x7FFF;
+      uint16_t digits = negative ? (pair3 & 0x7FFF) : pair3;
+      float v = static_cast<float>(digits) / std::pow(10.0f, decimal);
+      return negative ? -v : v;
+    }
+
     uint8_t decimal = 0;
     switch (this->value_[REGPOINT] & 0x07) {
       case 0b001: decimal = 1; break;