From 21d1eff6fc9acfe44282a586664862ad96aa5c36 Mon Sep 17 00:00:00 2001
From: Nikolay Vasilchuk <anonym.tsk@gmail.com>
Date: Wed, 31 Jul 2019 18:35:13 +0300
Subject: [PATCH] First try

---
 esphome/components/mhz19/mhz19.cpp | 12 ++++++++++++
 esphome/components/mhz19/mhz19.h   |  9 +++++++++
 esphome/components/mhz19/sensor.py |  6 ++++++
 3 files changed, 27 insertions(+)

diff --git a/esphome/components/mhz19/mhz19.cpp b/esphome/components/mhz19/mhz19.cpp
index 8f46e288b6..386935cdd7 100644
--- a/esphome/components/mhz19/mhz19.cpp
+++ b/esphome/components/mhz19/mhz19.cpp
@@ -8,6 +8,8 @@ static const char *TAG = "mhz19";
 static const uint8_t MHZ19_REQUEST_LENGTH = 8;
 static const uint8_t MHZ19_RESPONSE_LENGTH = 9;
 static const uint8_t MHZ19_COMMAND_GET_PPM[] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00};
+static const uint8_t MHZ19_COMMAND_ABC_ENABLE[] = {0xff, 0x01, 0x79, 0xA0, 0x00, 0x00, 0x00, 0x00};
+static const uint8_t MHZ19_COMMAND_ABC_DISABLE[] = {0xff, 0x01, 0x79, 0x00, 0x00, 0x00, 0x00, 0x00};
 
 uint8_t mhz19_checksum(const uint8_t *command) {
   uint8_t sum = 0;
@@ -17,6 +19,16 @@ uint8_t mhz19_checksum(const uint8_t *command) {
   return 0xFF - sum + 0x01;
 }
 
+void MHZ19Component::setup() {
+  if (this->abc_logic_ == MHZ19_ABC_ENABLED) {
+    ESP_LOGV(TAG, "Enabling ABC on boot");
+    this->mhz19_write_command_(MHZ19_COMMAND_ABC_ENABLE, nullptr);
+  } else if (this->abc_logic_ == MHZ19_ABC_DISABLED) {
+    ESP_LOGV(TAG, "Disabling ABC on boot");
+    this->mhz19_write_command_(MHZ19_COMMAND_ABC_DISABLE, nullptr);
+  }
+}
+
 void MHZ19Component::update() {
   uint8_t response[MHZ19_RESPONSE_LENGTH];
   if (!this->mhz19_write_command_(MHZ19_COMMAND_GET_PPM, response)) {
diff --git a/esphome/components/mhz19/mhz19.h b/esphome/components/mhz19/mhz19.h
index 3604628afc..d9e7145a08 100644
--- a/esphome/components/mhz19/mhz19.h
+++ b/esphome/components/mhz19/mhz19.h
@@ -7,21 +7,30 @@
 namespace esphome {
 namespace mhz19 {
 
+enum MHZ19ABCLogic {
+  MHZ19_ABC_NONE = 0,
+  MHZ19_ABC_ENABLED,
+  MHZ19_ABC_DISABLED
+};
+
 class MHZ19Component : public PollingComponent, public uart::UARTDevice {
  public:
   float get_setup_priority() const override;
 
+  void setup() override;
   void update() override;
   void dump_config() override;
 
   void set_temperature_sensor(sensor::Sensor *temperature_sensor) { temperature_sensor_ = temperature_sensor; }
   void set_co2_sensor(sensor::Sensor *co2_sensor) { co2_sensor_ = co2_sensor; }
+  void set_abc_enabled(bool abc_enabled) { abc_logic_ = abc_enabled ? MHZ19_ABC_ENABLED : MHZ19_ABC_DISABLED; }
 
  protected:
   bool mhz19_write_command_(const uint8_t *command, uint8_t *response);
 
   sensor::Sensor *temperature_sensor_{nullptr};
   sensor::Sensor *co2_sensor_{nullptr};
+  MHZ19ABCLogic abc_logic_{MHZ19_ABC_NONE}
 };
 
 }  // namespace mhz19
diff --git a/esphome/components/mhz19/sensor.py b/esphome/components/mhz19/sensor.py
index 368426e6f7..0f34857351 100644
--- a/esphome/components/mhz19/sensor.py
+++ b/esphome/components/mhz19/sensor.py
@@ -6,6 +6,8 @@ from esphome.const import CONF_CO2, CONF_ID, CONF_TEMPERATURE, ICON_PERIODIC_TAB
 
 DEPENDENCIES = ['uart']
 
+CONF_AUTOMATIC_BASELINE_CALIBRATION = 'automatic_baseline_calibration'
+
 mhz19_ns = cg.esphome_ns.namespace('mhz19')
 MHZ19Component = mhz19_ns.class_('MHZ19Component', cg.PollingComponent, uart.UARTDevice)
 
@@ -13,6 +15,7 @@ CONFIG_SCHEMA = cv.Schema({
     cv.GenerateID(): cv.declare_id(MHZ19Component),
     cv.Required(CONF_CO2): sensor.sensor_schema(UNIT_PARTS_PER_MILLION, ICON_PERIODIC_TABLE_CO2, 0),
     cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(UNIT_CELSIUS, ICON_THERMOMETER, 0),
+    cv.Optional(CONF_AUTOMATIC_BASELINE_CALIBRATION): cv.boolean,
 }).extend(cv.polling_component_schema('60s')).extend(uart.UART_DEVICE_SCHEMA)
 
 
@@ -28,3 +31,6 @@ def to_code(config):
     if CONF_TEMPERATURE in config:
         sens = yield sensor.new_sensor(config[CONF_TEMPERATURE])
         cg.add(var.set_temperature_sensor(sens))
+
+    if CONF_AUTOMATIC_BASELINE_CALIBRATION in config:
+        cg.add(var.set_abc_enabled(config[CONF_AUTOMATIC_BASELINE_CALIBRATION]))