Pulse meter internal filter mode (#3082)

Co-authored-by: Paul Daumlechner <paul.daumlechner@live.de>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
Co-authored-by: Otto Winter <otto@otto-winter.com>

CODEOWNERS

@@ -144,7 +144,7 @@ esphome/components/pn532_spi/* @OttoWinter @jesserockz
 esphome/components/power_supply/* @esphome/core
 esphome/components/preferences/* @esphome/core
 esphome/components/psram/* @esphome/core
-esphome/components/pulse_meter/* @stevebaxter
+esphome/components/pulse_meter/* @cstaahl @stevebaxter
 esphome/components/pvvx_mithermometer/* @pasiz
 esphome/components/qr_code/* @wjtje
 esphome/components/radon_eye_ble/* @jeffeb3

esphome/components/pulse_meter/pulse_meter_sensor.cpp

@@ -12,18 +12,53 @@ void PulseMeterSensor::setup() {
   this->pin_->attach_interrupt(PulseMeterSensor::gpio_intr, this, gpio::INTERRUPT_ANY_EDGE);
 
   this->last_detected_edge_us_ = 0;
-  this->last_valid_edge_us_ = 0;
+  this->last_valid_low_edge_us_ = 0;
+  this->last_valid_high_edge_us_ = 0;
+  this->sensor_is_high_ = this->isr_pin_.digital_read();
 }
 
 void PulseMeterSensor::loop() {
   const uint32_t now = micros();
 
+  // Check to see if we should filter this edge out
+  if (this->filter_mode_ == FILTER_EDGE) {
+    if ((this->last_detected_edge_us_ - this->last_valid_high_edge_us_) >= this->filter_us_) {
+      // Don't measure the first valid pulse (we need at least two pulses to measure the width)
+      if (this->last_valid_high_edge_us_ != 0) {
+        this->pulse_width_us_ = (this->last_detected_edge_us_ - this->last_valid_high_edge_us_);
+      }
+      this->total_pulses_++;
+      this->last_valid_high_edge_us_ = this->last_detected_edge_us_;
+    }
+  } else {
+    // Make sure the signal has been stable long enough
+    if ((now - this->last_detected_edge_us_) >= this->filter_us_) {
+      // Only consider HIGH pulses and "new" edges if sensor state is LOW
+      if (!this->sensor_is_high_ && this->isr_pin_.digital_read() &&
+          (this->last_detected_edge_us_ != this->last_valid_high_edge_us_)) {
+        // Don't measure the first valid pulse (we need at least two pulses to measure the width)
+        if (this->last_valid_high_edge_us_ != 0) {
+          this->pulse_width_us_ = (this->last_detected_edge_us_ - this->last_valid_high_edge_us_);
+        }
+        this->sensor_is_high_ = true;
+        this->total_pulses_++;
+        this->last_valid_high_edge_us_ = this->last_detected_edge_us_;
+      }
+      // Only consider LOW pulses and "new" edges if sensor state is HIGH
+      else if (this->sensor_is_high_ && !this->isr_pin_.digital_read() &&
+               (this->last_detected_edge_us_ != this->last_valid_low_edge_us_)) {
+        this->sensor_is_high_ = false;
+        this->last_valid_low_edge_us_ = this->last_detected_edge_us_;
+      }
+    }
+  }
+
   // If we've exceeded our timeout interval without receiving any pulses, assume 0 pulses/min until
   // we get at least two valid pulses.
-  const uint32_t time_since_valid_edge_us = now - this->last_valid_edge_us_;
-  if ((this->last_valid_edge_us_ != 0) && (time_since_valid_edge_us > this->timeout_us_)) {
+  const uint32_t time_since_valid_edge_us = now - this->last_valid_high_edge_us_;
+  if ((this->last_valid_high_edge_us_ != 0) && (time_since_valid_edge_us > this->timeout_us_) &&
+      (this->pulse_width_us_ != 0)) {
     ESP_LOGD(TAG, "No pulse detected for %us, assuming 0 pulses/min", time_since_valid_edge_us / 1000000);
-    this->last_valid_edge_us_ = 0;
     this->pulse_width_us_ = 0;
   }
 
@@ -52,7 +87,11 @@ void PulseMeterSensor::set_total_pulses(uint32_t pulses) { this->total_pulses_ =
 void PulseMeterSensor::dump_config() {
   LOG_SENSOR("", "Pulse Meter", this);
   LOG_PIN("  Pin: ", this->pin_);
+  if (this->filter_mode_ == FILTER_EDGE) {
+    ESP_LOGCONFIG(TAG, "  Filtering rising edges less than %u µs apart", this->filter_us_);
+  } else {
     ESP_LOGCONFIG(TAG, "  Filtering pulses shorter than %u µs", this->filter_us_);
+  }
   ESP_LOGCONFIG(TAG, "  Assuming 0 pulses/min after not receiving a pulse for %us", this->timeout_us_ / 1000000);
 }
 
@@ -62,23 +101,14 @@ void IRAM_ATTR PulseMeterSensor::gpio_intr(PulseMeterSensor *sensor) {
   // Get the current time before we do anything else so the measurements are consistent
   const uint32_t now = micros();
 
-  // We only look at rising edges
-  if (!sensor->isr_pin_.digital_read()) {
-    return;
-  }
-
-  // Check to see if we should filter this edge out
-  if ((now - sensor->last_detected_edge_us_) >= sensor->filter_us_) {
-    // Don't measure the first valid pulse (we need at least two pulses to measure the width)
-    if (sensor->last_valid_edge_us_ != 0) {
-      sensor->pulse_width_us_ = (now - sensor->last_valid_edge_us_);
-    }
-
-    sensor->total_pulses_++;
-    sensor->last_valid_edge_us_ = now;
-  }
-
+  // We only look at rising edges in EDGE mode, and all edges in PULSE mode
+  if (sensor->filter_mode_ == FILTER_EDGE) {
+    if (sensor->isr_pin_.digital_read()) {
       sensor->last_detected_edge_us_ = now;
+    }
+  } else {
+    sensor->last_detected_edge_us_ = now;
+  }
 }
 
 }  // namespace pulse_meter

esphome/components/pulse_meter/pulse_meter_sensor.h

@@ -10,8 +10,14 @@ namespace pulse_meter {
 
 class PulseMeterSensor : public sensor::Sensor, public Component {
  public:
+  enum InternalFilterMode {
+    FILTER_EDGE = 0,
+    FILTER_PULSE,
+  };
+
   void set_pin(InternalGPIOPin *pin) { this->pin_ = pin; }
   void set_filter_us(uint32_t filter) { this->filter_us_ = filter; }
+  void set_filter_mode(InternalFilterMode mode) { this->filter_mode_ = mode; }
   void set_timeout_us(uint32_t timeout) { this->timeout_us_ = timeout; }
   void set_total_sensor(sensor::Sensor *sensor) { this->total_sensor_ = sensor; }
 
@@ -30,14 +36,17 @@ class PulseMeterSensor : public sensor::Sensor, public Component {
   uint32_t filter_us_ = 0;
   uint32_t timeout_us_ = 1000000UL * 60UL * 5UL;
   sensor::Sensor *total_sensor_ = nullptr;
+  InternalFilterMode filter_mode_{FILTER_EDGE};
 
   Deduplicator<uint32_t> pulse_width_dedupe_;
   Deduplicator<uint32_t> total_dedupe_;
 
   volatile uint32_t last_detected_edge_us_ = 0;
-  volatile uint32_t last_valid_edge_us_ = 0;
+  volatile uint32_t last_valid_low_edge_us_ = 0;
+  volatile uint32_t last_valid_high_edge_us_ = 0;
   volatile uint32_t pulse_width_us_ = 0;
   volatile uint32_t total_pulses_ = 0;
+  volatile bool sensor_is_high_ = false;
 };
 
 }  // namespace pulse_meter

esphome/components/pulse_meter/sensor.py

@@ -5,6 +5,7 @@ from esphome.components import sensor
 from esphome.const import (
     CONF_ID,
     CONF_INTERNAL_FILTER,
+    CONF_INTERNAL_FILTER_MODE,
     CONF_PIN,
     CONF_NUMBER,
     CONF_TIMEOUT,
@@ -18,14 +19,21 @@ from esphome.const import (
 )
 from esphome.core import CORE
 
-CODEOWNERS = ["@stevebaxter"]
+CODEOWNERS = ["@stevebaxter", "@cstaahl"]
 
 pulse_meter_ns = cg.esphome_ns.namespace("pulse_meter")
 
+
 PulseMeterSensor = pulse_meter_ns.class_(
     "PulseMeterSensor", sensor.Sensor, cg.Component
 )
 
+PulseMeterInternalFilterMode = PulseMeterSensor.enum("InternalFilterMode")
+FILTER_MODES = {
+    "EDGE": PulseMeterInternalFilterMode.FILTER_EDGE,
+    "PULSE": PulseMeterInternalFilterMode.FILTER_PULSE,
+}
+
 SetTotalPulsesAction = pulse_meter_ns.class_("SetTotalPulsesAction", automation.Action)
 
 
@@ -66,6 +74,9 @@ CONFIG_SCHEMA = sensor.sensor_schema(
             accuracy_decimals=0,
             state_class=STATE_CLASS_TOTAL_INCREASING,
         ),
+        cv.Optional(CONF_INTERNAL_FILTER_MODE, default="EDGE"): cv.enum(
+            FILTER_MODES, upper=True
+        ),
     }
 )
 
@@ -78,6 +89,7 @@ async def to_code(config):
     cg.add(var.set_pin(pin))
     cg.add(var.set_filter_us(config[CONF_INTERNAL_FILTER]))
     cg.add(var.set_timeout_us(config[CONF_TIMEOUT]))
+    cg.add(var.set_filter_mode(config[CONF_INTERNAL_FILTER_MODE]))
 
     if CONF_TOTAL in config:
         sens = await sensor.new_sensor(config[CONF_TOTAL])

esphome/const.py

@@ -307,6 +307,7 @@ CONF_INTENSITY = "intensity"
 CONF_INTERLOCK = "interlock"
 CONF_INTERNAL = "internal"
 CONF_INTERNAL_FILTER = "internal_filter"
+CONF_INTERNAL_FILTER_MODE = "internal_filter_mode"
 CONF_INTERRUPT = "interrupt"
 CONF_INTERVAL = "interval"
 CONF_INVALID_COOLDOWN = "invalid_cooldown"