Optimized for mem pressure, inverted colors.

esphome/owon-b35t.yaml

@@ -44,11 +44,25 @@ wifi:
     ssid: "OWON B35T Fallback Hotspot"
     password: !secret fallback_psk
 
-captive_portal:
+# Disabled to save RAM on the M5Stack Core 1. Re-enable temporarily if Wi-Fi recovery is needed.
+# captive_portal:
+
+interval:
+  - interval: 10s
+    then:
+      - lambda: |-
+          ESP_LOGI("mem", "heap free=%u min_free=%u internal_free=%u internal_largest=%u dma_free=%u dma_largest=%u",
+                   static_cast<unsigned>(esp_get_free_heap_size()),
+                   static_cast<unsigned>(esp_get_minimum_free_heap_size()),
+                   static_cast<unsigned>(heap_caps_get_free_size(MALLOC_CAP_INTERNAL)),
+                   static_cast<unsigned>(heap_caps_get_largest_free_block(MALLOC_CAP_INTERNAL)),
+                   static_cast<unsigned>(heap_caps_get_free_size(MALLOC_CAP_DMA)),
+                   static_cast<unsigned>(heap_caps_get_largest_free_block(MALLOC_CAP_DMA)));
 
 esp32_ble_tracker:
   scan_parameters:
     active: true
+    continuous: true
 
 ble_client:
   - mac_address: ${owon_mac_address}
@@ -158,7 +172,7 @@ display:
     cs_pin: GPIO14
     dc_pin: GPIO27
     reset_pin: GPIO33
-    invert_colors: false
+    invert_colors: true
     color_palette: 8BIT
     rotation: 0
     update_interval: 500ms
@@ -235,34 +249,6 @@ binary_sensor:
     name: "${friendly_name} Low Battery"
     lambda: |-
       return owon_meter.low_battery;
-  - platform: template
-    name: "${friendly_name} Auto Range"
-    lambda: |-
-      return owon_meter.auto_range();
-  - platform: template
-    name: "${friendly_name} Hold"
-    lambda: |-
-      return owon_meter.hold();
-  - platform: template
-    name: "${friendly_name} Relative"
-    lambda: |-
-      return owon_meter.relative();
-  - platform: template
-    name: "${friendly_name} AC"
-    lambda: |-
-      return owon_meter.ac();
-  - platform: template
-    name: "${friendly_name} DC"
-    lambda: |-
-      return owon_meter.dc();
-  - platform: template
-    name: "${friendly_name} Continuity"
-    lambda: |-
-      return owon_meter.continuity();
-  - platform: template
-    name: "${friendly_name} Diode"
-    lambda: |-
-      return owon_meter.diode();
 
 sensor:
   - platform: ble_client
@@ -286,7 +272,7 @@ sensor:
     name: "${friendly_name} Display Value"
     id: owon_display_value
     accuracy_decimals: 6
-    update_interval: 1s
+    update_interval: 2s
     lambda: |-
       return owon_meter.has_reading && !owon_meter.overload ? owon_meter.value() : NAN;
 
@@ -294,95 +280,23 @@ sensor:
     name: "${friendly_name} Base Value"
     id: owon_base_value
     accuracy_decimals: 9
-    update_interval: 1s
+    update_interval: 2s
     lambda: |-
       return owon_meter.has_reading && !owon_meter.overload ? owon_meter.value_base() : NAN;
 
-  - platform: template
-    name: "${friendly_name} Voltage"
-    device_class: voltage
-    unit_of_measurement: "V"
-    accuracy_decimals: 6
-    update_interval: 1s
-    lambda: |-
-      return owon_meter.kind() == owon_b35t::Meter::KIND_VOLTAGE && !owon_meter.overload ? owon_meter.value_base() : NAN;
-
-  - platform: template
-    name: "${friendly_name} Current"
-    device_class: current
-    unit_of_measurement: "A"
-    accuracy_decimals: 6
-    update_interval: 1s
-    lambda: |-
-      return owon_meter.kind() == owon_b35t::Meter::KIND_CURRENT && !owon_meter.overload ? owon_meter.value_base() : NAN;
-
-  - platform: template
-    name: "${friendly_name} Resistance"
-    unit_of_measurement: "Ω"
-    accuracy_decimals: 3
-    update_interval: 1s
-    lambda: |-
-      return owon_meter.kind() == owon_b35t::Meter::KIND_RESISTANCE && !owon_meter.overload ? owon_meter.value_base() : NAN;
-
-  - platform: template
-    name: "${friendly_name} Frequency"
-    device_class: frequency
-    unit_of_measurement: "Hz"
-    accuracy_decimals: 3
-    update_interval: 1s
-    lambda: |-
-      return owon_meter.kind() == owon_b35t::Meter::KIND_FREQUENCY && !owon_meter.overload ? owon_meter.value_base() : NAN;
-
-  - platform: template
-    name: "${friendly_name} Capacitance"
-    unit_of_measurement: "F"
-    accuracy_decimals: 12
-    update_interval: 1s
-    lambda: |-
-      return owon_meter.kind() == owon_b35t::Meter::KIND_CAPACITANCE && !owon_meter.overload ? owon_meter.value_base() : NAN;
-
-  - platform: template
-    name: "${friendly_name} Temperature"
-    device_class: temperature
-    unit_of_measurement: "°C"
-    accuracy_decimals: 2
-    update_interval: 1s
-    lambda: |-
-      if (owon_meter.kind() == owon_b35t::Meter::KIND_TEMP_C && !owon_meter.overload) return owon_meter.value();
-      if (owon_meter.kind() == owon_b35t::Meter::KIND_TEMP_F && !owon_meter.overload) return (owon_meter.value() - 32.0f) * 5.0f / 9.0f;
-      return NAN;
-
-  - platform: template
-    name: "${friendly_name} Duty Cycle"
-    unit_of_measurement: "%"
-    accuracy_decimals: 2
-    update_interval: 1s
-    lambda: |-
-      return owon_meter.kind() == owon_b35t::Meter::KIND_DUTY && !owon_meter.overload ? owon_meter.value() : NAN;
-
 text_sensor:
   - platform: template
     name: "${friendly_name} Reading"
-    update_interval: 1s
+    update_interval: 2s
     lambda: |-
       return owon_meter.reading_text();
   - platform: template
     name: "${friendly_name} Unit"
-    update_interval: 1s
+    update_interval: 2s
     lambda: |-
       return std::string(owon_meter.scale()) + owon_meter.unit();
   - platform: template
     name: "${friendly_name} Mode"
-    update_interval: 1s
+    update_interval: 2s
     lambda: |-
       return owon_meter.mode_text();
-  - platform: template
-    name: "${friendly_name} Meter Type"
-    update_interval: 1s
-    lambda: |-
-      return owon_meter.is_plus ? std::string("B35T+") : std::string("B35T");
-  - platform: template
-    name: "${friendly_name} Selected Button"
-    update_interval: 1s
-    lambda: |-
-      return std::string(owon_meter.selected_button_name());

esphome/owon_b35t.h

@@ -10,6 +10,8 @@
 #include <cstring>
 #include <string>
 #include <vector>
+#include "esp_heap_caps.h"
+#include "esp_system.h"
 #include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
 #include "esphome/components/display/display.h"