Add AC Dimmer support (#880)

* Add AC Dimmer support

Fixes https://github.com/esphome/feature-requests/issues/278

* fixes

basically missed the output pin setup and in the switching was switching true true true :P

* Format

* Enable ESP32

* Also setup ZC pin

* Support multiple dimmers sharing ZC pin

* Fix ESP32

* Lint

* off gate on zc detect

* tests pins validation

* Climate Mitsubishi (#725)

* add climate

* Mitsubishi updates

* refactor mitsubishi to use climate_ir

* lint

* fix: only decode when not str already (#923)

Signed-off-by: wilmardo <info@wilmardenouden.nl>

* fix climate-ir bad merge (#935)

* fix climate-ir bad merge

* add mitshubishi test

* http_request: fix memory allocation (#916)

* http_request version fix (#917)

* PID Climate (#885)

* PID Climate

* Add sensor for debugging PID output value

* Add dump_config, use percent

* Add more observable values

* Update

* Set target temperature

* Add autotuner

* Add algorithm explanation

* Add autotuner action, update controller

* Add simulator

* Format

* Change defaults

* Updates

* Use b''.decode() instead of str(b'') (#941)

Handling of request arguments in WizardRequestHandler is not decoding
bytes and rather just doing a str conversion resulting in a value of
"b''" being supplied to the wizard code.

* Adding the espressif 2.6.3 (#944)

* extract and use current version of python 3 (#938)

* Inverted output in neopixelbus (#895)

* Added inverted output

* Added support for inverted output in neopixelbus

* Update esphome/components/neopixelbus/light.py

Co-Authored-By: Otto Winter <otto@otto-winter.com>

* Update light.py

* corrected lint errors

Co-authored-by: Otto Winter <otto@otto-winter.com>

* Added degree symbol for MAX7219 7-segment display. (#764)

The ascii char to use it is "~" (0x7E).

Disclaimer: I didn't test this yet.

* Fix dump/tx of 64 bit codes (#940)

* Fix dump/tx of 64 bit codes

* fixed source format

* Update hdc1080.cpp (#887)

* Update hdc1080.cpp

increase waittime, to fix reading errors

* Fix: Update HDC1080.cpp

i fixed the my change on write_bytes

* add tcl112 support for dry, fan and swing (#939)

* Fix SGP30 incorrect baseline reading/writing (#936)

* Split the SGP30 baseline into 2 values

- According to the SGP30 datasheet, each eCO2 and TVOC baseline is a 2-byte value (MSB first)
- The current implementation ignores the MSB of each of the value
- Update the schema to allow 2 different baseline values (optional, but both need to be specified for the baseline to apply)

* Make both eCO2 and TVOC required if the optional baseline is defined

* Make dump_config() looks better

* Add register_*_effect to allow registering custom effects (#947)

This allows to register custom effect from user components,
allowing for bigger composability of source.

* Bugfix/normalize core comparisons (and Python 3 update fixes) (#952)

* Correct implementation of comparisons to be Pythonic

If a comparison cannot be made return NotImplemented, this allows the
Python interpreter to try other comparisons (eg __ieq__) and either
return False (in the case of __eq__) or raise a TypeError
exception (eg in the case of __lt__).

* Python 3 updates

* Add a more helpful message in exception if platform is not defined

* Added a basic pre-commit check

* Add transmit pioneer (#922)

* Added pioneer_protocol to support transmit_pioneer

* Display tm1637 (#946)

* add TM1637 support

* Support a further variant of Xiaomi CGG1 (#930)

* Daikin climate ir component (#964)

* Daikin ARC43XXX IR remote controller support

* Format and lint fixes

* Check temperature values against allowed min/max

* fix tm1637 missing __init__.py (#975)

* Add AC Dimmer support

Fixes https://github.com/esphome/feature-requests/issues/278

* fixes

basically missed the output pin setup and in the switching was switching true true true :P

* Format

* Enable ESP32

* Also setup ZC pin

* Support multiple dimmers sharing ZC pin

* Fix ESP32

* Lint

* off gate on zc detect

* tests pins validation

* fix esp8266 many dimmers, changed timing

* Increased value resolution, added min power

* use min_power from base class

* fix min_power. add init with half cycle

* added method for trailing pulse, trailing and leading

* fix method name. try filter invalid falling pulse

* renamed to ac_dimmer

* fix ESP32 not configuring zero cross twice

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>
Co-authored-by: Wilmar den Ouden <wilmardo@users.noreply.github.com>
Co-authored-by: Nikolay Vasilchuk <Anonym.tsk@gmail.com>
Co-authored-by: Tim Savage <tim@savage.company>
Co-authored-by: Vc <37367415+Valcob@users.noreply.github.com>
Co-authored-by: gitolicious <mrjchn@gmail.com>
Co-authored-by: voibit <krestean@gmail.com>
Co-authored-by: Luar Roji <cyberplant@users.noreply.github.com>
Co-authored-by: András Bíró <1202136+andrasbiro@users.noreply.github.com>
Co-authored-by: dmkif <dmkif@users.noreply.github.com>
Co-authored-by: Panuruj Khambanonda (PK) <pk@panurujk.com>
Co-authored-by: Kamil Trzciński <ayufan@ayufan.eu>
Co-authored-by: Keith Burzinski <kbx81x@gmail.com>
Co-authored-by: Mario <4376789+mario-tux@users.noreply.github.com>
Co-authored-by: Héctor Giménez <hector.fwbz@gmail.com>

esphome/components/ac_dimmer/ac_dimmer.cpp

@@ -0,0 +1,217 @@
+#include "ac_dimmer.h"
+#include "esphome/core/helpers.h"
+#include "esphome/core/log.h"
+
+#ifdef ARDUINO_ARCH_ESP8266
+#include <core_esp8266_waveform.h>
+#endif
+
+namespace esphome {
+namespace ac_dimmer {
+
+static const char *TAG = "ac_dimmer";
+
+// Global array to store dimmer objects
+static AcDimmerDataStore *all_dimmers[32];
+
+/// Time in microseconds the gate should be held high
+/// 10µs should be long enough for most triacs
+/// For reference: BT136 datasheet says 2µs nominal (page 7)
+static uint32_t GATE_ENABLE_TIME = 10;
+
+/// Function called from timer interrupt
+/// Input is current time in microseconds (micros())
+/// Returns when next "event" is expected in µs, or 0 if no such event known.
+uint32_t ICACHE_RAM_ATTR HOT AcDimmerDataStore::timer_intr(uint32_t now) {
+  // If no ZC signal received yet.
+  if (this->crossed_zero_at == 0)
+    return 0;
+
+  uint32_t time_since_zc = now - this->crossed_zero_at;
+  if (this->value == 65535 || this->value == 0) {
+    return 0;
+  }
+
+  if (this->enable_time_us != 0 && time_since_zc >= this->enable_time_us) {
+    this->enable_time_us = 0;
+    this->gate_pin->digital_write(true);
+    // Prevent too short pulses
+    this->disable_time_us = max(this->disable_time_us, time_since_zc + GATE_ENABLE_TIME);
+  }
+  if (this->disable_time_us != 0 && time_since_zc >= this->disable_time_us) {
+    this->disable_time_us = 0;
+    this->gate_pin->digital_write(false);
+  }
+
+  if (time_since_zc < this->enable_time_us)
+    // Next event is enable, return time until that event
+    return this->enable_time_us - time_since_zc;
+  else if (time_since_zc < disable_time_us) {
+    // Next event is disable, return time until that event
+    return this->disable_time_us - time_since_zc;
+  }
+
+  if (time_since_zc >= this->cycle_time_us) {
+    // Already past last cycle time, schedule next call shortly
+    return 100;
+  }
+
+  return this->cycle_time_us - time_since_zc;
+}
+
+/// Run timer interrupt code and return in how many µs the next event is expected
+uint32_t ICACHE_RAM_ATTR HOT timer_interrupt() {
+  // run at least with 1kHz
+  uint32_t min_dt_us = 1000;
+  uint32_t now = micros();
+  for (auto *dimmer : all_dimmers) {
+    if (dimmer == nullptr)
+      // no more dimmers
+      break;
+    uint32_t res = dimmer->timer_intr(now);
+    if (res != 0 && res < min_dt_us)
+      min_dt_us = res;
+  }
+  // return time until next timer1 interrupt in µs
+  return min_dt_us;
+}
+
+/// GPIO interrupt routine, called when ZC pin triggers
+void ICACHE_RAM_ATTR HOT AcDimmerDataStore::gpio_intr() {
+  uint32_t prev_crossed = this->crossed_zero_at;
+
+  // 50Hz mains frequency should give a half cycle of 10ms a 60Hz will give 8.33ms
+  // in any case the cycle last at least 5ms
+  this->crossed_zero_at = micros();
+  uint32_t cycle_time = this->crossed_zero_at - prev_crossed;
+  if (cycle_time > 5000) {
+    this->cycle_time_us = cycle_time;
+  } else {
+    // Otherwise this is noise and this is 2nd (or 3rd...) fall in the same pulse
+    // Consider this is the right fall edge and accumulate the cycle time instead
+    this->cycle_time_us += cycle_time;
+  }
+
+  if (this->value == 65535) {
+    // fully on, enable output immediately
+    this->gate_pin->digital_write(true);
+  } else if (this->init_cycle) {
+    // send a full cycle
+    this->init_cycle = false;
+    this->enable_time_us = 0;
+    this->disable_time_us = cycle_time_us;
+  } else if (this->value == 0) {
+    // fully off, disable output immediately
+    this->gate_pin->digital_write(false);
+  } else {
+    if (this->method == DIM_METHOD_TRAILING) {
+      this->enable_time_us = 1;  // cannot be 0
+      this->disable_time_us = max((uint32_t) 10, this->value * this->cycle_time_us / 65535);
+    } else {
+      // calculate time until enable in µs: (1.0-value)*cycle_time, but with integer arithmetic
+      // also take into account min_power
+      auto min_us = this->cycle_time_us * this->min_power / 1000;
+      this->enable_time_us = max((uint32_t) 1, ((65535 - this->value) * (this->cycle_time_us - min_us)) / 65535);
+      if (this->method == DIM_METHOD_LEADING_PULSE) {
+        // Minimum pulse time should be enough for the triac to trigger when it is close to the ZC zone
+        // this is for brightness near 99%
+        this->disable_time_us = max(this->enable_time_us + GATE_ENABLE_TIME, (uint32_t) cycle_time_us / 10);
+      } else {
+        this->gate_pin->digital_write(false);
+        this->disable_time_us = this->cycle_time_us;
+      }
+    }
+  }
+}
+
+void ICACHE_RAM_ATTR HOT AcDimmerDataStore::s_gpio_intr(AcDimmerDataStore *store) {
+  // Attaching pin interrupts on the same pin will override the previous interupt
+  // However, the user expects that multiple dimmers sharing the same ZC pin will work.
+  // We solve this in a bit of a hacky way: On each pin interrupt, we check all dimmers
+  // if any of them are using the same ZC pin, and also trigger the interrupt for *them*.
+  for (auto *dimmer : all_dimmers) {
+    if (dimmer == nullptr)
+      break;
+    if (dimmer->zero_cross_pin_number == store->zero_cross_pin_number) {
+      dimmer->gpio_intr();
+    }
+  }
+}
+
+#ifdef ARDUINO_ARCH_ESP32
+// ESP32 implementation, uses basically the same code but needs to wrap
+// timer_interrupt() function to auto-reschedule
+static hw_timer_t *dimmer_timer = nullptr;
+void ICACHE_RAM_ATTR HOT AcDimmerDataStore::s_timer_intr() { timer_interrupt(); }
+#endif
+
+void AcDimmer::setup() {
+  // extend all_dimmers array with our dimmer
+
+  // Need to be sure the zero cross pin is setup only once, ESP8266 fails and ESP32 seems to fail silently
+  auto setup_zero_cross_pin = true;
+
+  for (auto &all_dimmer : all_dimmers) {
+    if (all_dimmer == nullptr) {
+      all_dimmer = &this->store_;
+      break;
+    }
+    if (all_dimmer->zero_cross_pin_number == this->zero_cross_pin_->get_pin()) {
+      setup_zero_cross_pin = false;
+    }
+  }
+
+  this->gate_pin_->setup();
+  this->store_.gate_pin = this->gate_pin_->to_isr();
+  this->store_.zero_cross_pin_number = this->zero_cross_pin_->get_pin();
+  this->store_.min_power = static_cast<uint16_t>(this->min_power_ * 1000);
+  this->min_power_ = 0;
+  this->store_.method = this->method_;
+
+  if (setup_zero_cross_pin) {
+    this->zero_cross_pin_->setup();
+    this->store_.zero_cross_pin = this->zero_cross_pin_->to_isr();
+    this->zero_cross_pin_->attach_interrupt(&AcDimmerDataStore::s_gpio_intr, &this->store_, FALLING);
+  }
+
+#ifdef ARDUINO_ARCH_ESP8266
+  // Uses ESP8266 waveform (soft PWM) class
+  // PWM and AcDimmer can even run at the same time this way
+  setTimer1Callback(&timer_interrupt);
+#endif
+#ifdef ARDUINO_ARCH_ESP32
+  // 80 Divider -> 1 count=1µs
+  dimmer_timer = timerBegin(0, 80, true);
+  timerAttachInterrupt(dimmer_timer, &AcDimmerDataStore::s_timer_intr, true);
+  // For ESP32, we can't use dynamic interval calculation because the timerX functions
+  // are not callable from ISR (placed in flash storage).
+  // Here we just use an interrupt firing every 50 µs.
+  timerAlarmWrite(dimmer_timer, 50, true);
+  timerAlarmEnable(dimmer_timer);
+#endif
+}
+void AcDimmer::write_state(float state) {
+  auto new_value = static_cast<uint16_t>(roundf(state * 65535));
+  if (new_value != 0 && this->store_.value == 0)
+    this->store_.init_cycle = this->init_with_half_cycle_;
+  this->store_.value = new_value;
+}
+void AcDimmer::dump_config() {
+  ESP_LOGCONFIG(TAG, "AcDimmer:");
+  LOG_PIN("  Output Pin: ", this->gate_pin_);
+  LOG_PIN("  Zero-Cross Pin: ", this->zero_cross_pin_);
+  ESP_LOGCONFIG(TAG, "   Min Power: %.1f%%", this->store_.min_power / 10.0f);
+  ESP_LOGCONFIG(TAG, "   Init with half cycle: %s", YESNO(this->init_with_half_cycle_));
+  if (method_ == DIM_METHOD_LEADING_PULSE)
+    ESP_LOGCONFIG(TAG, "   Method: leading pulse");
+  else if (method_ == DIM_METHOD_LEADING)
+    ESP_LOGCONFIG(TAG, "   Method: leading");
+  else
+    ESP_LOGCONFIG(TAG, "   Method: trailing");
+
+  LOG_FLOAT_OUTPUT(this);
+  ESP_LOGV(TAG, "  Estimated Frequency: %.3fHz", 1e6f / this->store_.cycle_time_us / 2);
+}
+
+}  // namespace ac_dimmer
+}  // namespace esphome

esphome/components/ac_dimmer/ac_dimmer.h

@@ -0,0 +1,66 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/core/esphal.h"
+#include "esphome/components/output/float_output.h"
+
+namespace esphome {
+namespace ac_dimmer {
+
+enum DimMethod { DIM_METHOD_LEADING_PULSE = 0, DIM_METHOD_LEADING, DIM_METHOD_TRAILING };
+
+struct AcDimmerDataStore {
+  /// Zero-cross pin
+  ISRInternalGPIOPin *zero_cross_pin;
+  /// Zero-cross pin number - used to share ZC pin across multiple dimmers
+  uint8_t zero_cross_pin_number;
+  /// Output pin to write to
+  ISRInternalGPIOPin *gate_pin;
+  /// Value of the dimmer - 0 to 65535.
+  uint16_t value;
+  /// Minimum power for activation
+  uint16_t min_power;
+  /// Time between the last two ZC pulses
+  uint32_t cycle_time_us;
+  /// Time (in micros()) of last ZC signal
+  uint32_t crossed_zero_at;
+  /// Time since last ZC pulse to enable gate pin. 0 means not set.
+  uint32_t enable_time_us;
+  /// Time since last ZC pulse to disable gate pin. 0 means no disable.
+  uint32_t disable_time_us;
+  /// Set to send the first half ac cycle complete
+  bool init_cycle;
+  /// Dimmer method
+  DimMethod method;
+
+  uint32_t timer_intr(uint32_t now);
+
+  void gpio_intr();
+  static void s_gpio_intr(AcDimmerDataStore *store);
+#ifdef ARDUINO_ARCH_ESP32
+  static void s_timer_intr();
+#endif
+};
+
+class AcDimmer : public output::FloatOutput, public Component {
+ public:
+  void setup() override;
+
+  void dump_config() override;
+  void set_gate_pin(GPIOPin *gate_pin) { gate_pin_ = gate_pin; }
+  void set_zero_cross_pin(GPIOPin *zero_cross_pin) { zero_cross_pin_ = zero_cross_pin; }
+  void set_init_with_half_cycle(bool init_with_half_cycle) { init_with_half_cycle_ = init_with_half_cycle; }
+  void set_method(DimMethod method) { method_ = method; }
+
+ protected:
+  void write_state(float state) override;
+
+  GPIOPin *gate_pin_;
+  GPIOPin *zero_cross_pin_;
+  AcDimmerDataStore store_;
+  bool init_with_half_cycle_;
+  DimMethod method_;
+};
+
+}  // namespace ac_dimmer
+}  // namespace esphome

esphome/components/ac_dimmer/output.py

@@ -0,0 +1,43 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome import pins
+from esphome.components import output
+from esphome.const import CONF_ID, CONF_MIN_POWER, CONF_METHOD
+
+ac_dimmer_ns = cg.esphome_ns.namespace('ac_dimmer')
+AcDimmer = ac_dimmer_ns.class_('AcDimmer', output.FloatOutput, cg.Component)
+
+DimMethod = ac_dimmer_ns.enum('DimMethod')
+DIM_METHODS = {
+    'LEADING_PULSE': DimMethod.DIM_METHOD_LEADING_PULSE,
+    'LEADING': DimMethod.DIM_METHOD_LEADING,
+    'TRAILING': DimMethod.DIM_METHOD_TRAILING,
+}
+
+CONF_GATE_PIN = 'gate_pin'
+CONF_ZERO_CROSS_PIN = 'zero_cross_pin'
+CONF_INIT_WITH_HALF_CYCLE = 'init_with_half_cycle'
+CONFIG_SCHEMA = output.FLOAT_OUTPUT_SCHEMA.extend({
+    cv.Required(CONF_ID): cv.declare_id(AcDimmer),
+    cv.Required(CONF_GATE_PIN): pins.internal_gpio_output_pin_schema,
+    cv.Required(CONF_ZERO_CROSS_PIN): pins.internal_gpio_input_pin_schema,
+    cv.Optional(CONF_INIT_WITH_HALF_CYCLE, default=True): cv.boolean,
+    cv.Optional(CONF_METHOD, default='leading pulse'): cv.enum(DIM_METHODS, upper=True, space='_'),
+}).extend(cv.COMPONENT_SCHEMA)
+
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
+
+    # override default min power to 10%
+    if CONF_MIN_POWER not in config:
+        config[CONF_MIN_POWER] = 0.1
+    yield output.register_output(var, config)
+
+    pin = yield cg.gpio_pin_expression(config[CONF_GATE_PIN])
+    cg.add(var.set_gate_pin(pin))
+    pin = yield cg.gpio_pin_expression(config[CONF_ZERO_CROSS_PIN])
+    cg.add(var.set_zero_cross_pin(pin))
+    cg.add(var.set_init_with_half_cycle(config[CONF_INIT_WITH_HALF_CYCLE]))
+    cg.add(var.set_method(config[CONF_METHOD]))

tests/test1.yaml

@@ -1012,6 +1012,10 @@ output:
     id: id24
     pin: GPIO26
     period: 15s
+  - platform: ac_dimmer
+    id: dimmer1
+    gate_pin: GPIO5
+    zero_cross_pin: GPIO26
 
 light:
   - platform: binary

tests/test3.yaml

@@ -649,6 +649,10 @@ output:
       return {s};
     outputs:
       - id: custom_float
+  - platform: ac_dimmer
+    id: dimmer1
+    gate_pin: GPIO5
+    zero_cross_pin: GPIO12
 
 mcp23017:
   id: mcp23017_hub