How to use the esphome.codegen.add function in esphome

var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)
    yield sensor.register_sensor(var, config)
    pin_a = yield cg.gpio_pin_expression(config[CONF_PIN_A])
    cg.add(var.set_pin_a(pin_a))
    pin_b = yield cg.gpio_pin_expression(config[CONF_PIN_B])
    cg.add(var.set_pin_b(pin_b))

    if CONF_PIN_RESET in config:
        pin_i = yield cg.gpio_pin_expression(config[CONF_PIN_RESET])
        cg.add(var.set_reset_pin(pin_i))
    cg.add(var.set_resolution(config[CONF_RESOLUTION]))
    if CONF_MIN_VALUE in config:
        cg.add(var.set_min_value(config[CONF_MIN_VALUE]))
    if CONF_MAX_VALUE in config:
        cg.add(var.set_max_value(config[CONF_MAX_VALUE]))

def setup_binary_sensor_core_(var, config):
    cg.add(var.set_name(config[CONF_NAME]))
    if CONF_INTERNAL in config:
        cg.add(var.set_internal(CONF_INTERNAL))
    if CONF_DEVICE_CLASS in config:
        cg.add(var.set_device_class(config[CONF_DEVICE_CLASS]))
    if CONF_INVERTED in config:
        cg.add(var.set_inverted(config[CONF_INVERTED]))
    if CONF_FILTERS in config:
        filters = yield cg.build_registry_list(FILTER_REGISTRY, config[CONF_FILTERS])
        cg.add(var.add_filters(filters))

    for conf in config.get(CONF_ON_PRESS, []):
        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], var)
        yield automation.build_automation(trigger, [], conf)

    for conf in config.get(CONF_ON_RELEASE, []):
        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], var)
        yield automation.build_automation(trigger, [], conf)

    for conf in config.get(CONF_ON_CLICK, []):
        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], var,
                                   conf[CONF_MIN_LENGTH], conf[CONF_MAX_LENGTH])
        yield automation.build_automation(trigger, [], conf)

def register_listener(var, config):
    receiver = yield cg.get_variable(config[CONF_RECEIVER_ID])
    cg.add(receiver.register_listener(var))

cf1 = yield cg.gpio_pin_expression(config[CONF_CF1_PIN])
    cg.add(var.set_cf1_pin(cf1))

    if CONF_VOLTAGE in config:
        sens = yield sensor.new_sensor(config[CONF_VOLTAGE])
        cg.add(var.set_voltage_sensor(sens))
    if CONF_CURRENT in config:
        sens = yield sensor.new_sensor(config[CONF_CURRENT])
        cg.add(var.set_current_sensor(sens))
    if CONF_POWER in config:
        sens = yield sensor.new_sensor(config[CONF_POWER])
        cg.add(var.set_power_sensor(sens))
    cg.add(var.set_current_resistor(config[CONF_CURRENT_RESISTOR]))
    cg.add(var.set_voltage_divider(config[CONF_VOLTAGE_DIVIDER]))
    cg.add(var.set_change_mode_every(config[CONF_CHANGE_MODE_EVERY]))
    cg.add(var.set_initial_mode(INITIAL_MODES[config[CONF_INITIAL_MODE]]))

def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)

    cg.add(var.set_port(config[CONF_PORT]))
    cg.add(var.set_password(config[CONF_PASSWORD]))
    cg.add(var.set_reboot_timeout(config[CONF_REBOOT_TIMEOUT]))

    for conf in config.get(CONF_SERVICES, []):
        template_args = []
        func_args = []
        service_arg_names = []
        for name, var_ in conf[CONF_VARIABLES].items():
            native = SERVICE_ARG_NATIVE_TYPES[var_]
            template_args.append(native)
            func_args.append((native, name))
            service_arg_names.append(name)
        templ = cg.TemplateArguments(*template_args)
        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], templ,
                                   conf[CONF_SERVICE], service_arg_names)
        cg.add(var.register_user_service(trigger))
        yield automation.build_automation(trigger, func_args, conf)

def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)

    sel = yield cg.gpio_pin_expression(config[CONF_SEL_PIN])
    cg.add(var.set_sel_pin(sel))
    cf = yield cg.gpio_pin_expression(config[CONF_CF_PIN])
    cg.add(var.set_cf_pin(cf))
    cf1 = yield cg.gpio_pin_expression(config[CONF_CF1_PIN])
    cg.add(var.set_cf1_pin(cf1))

    if CONF_VOLTAGE in config:
        sens = yield sensor.new_sensor(config[CONF_VOLTAGE])
        cg.add(var.set_voltage_sensor(sens))
    if CONF_CURRENT in config:
        sens = yield sensor.new_sensor(config[CONF_CURRENT])
        cg.add(var.set_current_sensor(sens))
    if CONF_POWER in config:
        sens = yield sensor.new_sensor(config[CONF_POWER])
        cg.add(var.set_power_sensor(sens))
    cg.add(var.set_current_resistor(config[CONF_CURRENT_RESISTOR]))
    cg.add(var.set_voltage_divider(config[CONF_VOLTAGE_DIVIDER]))
    cg.add(var.set_change_mode_every(config[CONF_CHANGE_MODE_EVERY]))
    cg.add(var.set_initial_mode(INITIAL_MODES[config[CONF_INITIAL_MODE]]))

def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)
    params = config[CONF_SCAN_PARAMETERS]
    cg.add(var.set_scan_duration(params[CONF_DURATION]))
    cg.add(var.set_scan_interval(int(params[CONF_INTERVAL].total_milliseconds / 0.625)))
    cg.add(var.set_scan_window(int(params[CONF_WINDOW].total_milliseconds / 0.625)))
    cg.add(var.set_scan_active(params[CONF_ACTIVE]))

def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)

    out = yield cg.get_variable(config[CONF_OUTPUT])
    cg.add(var.set_output(out))
    cg.add(var.set_min_level(config[CONF_MIN_LEVEL]))
    cg.add(var.set_idle_level(config[CONF_IDLE_LEVEL]))
    cg.add(var.set_max_level(config[CONF_MAX_LEVEL]))
    cg.add(var.set_restore(config[CONF_RESTORE]))

def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)
    yield i2c.register_i2c_device(var, config)
    yield sensor.register_sensor(var, config)

    cg.add(var.set_integration_time(config[CONF_INTEGRATION_TIME]))
    cg.add(var.set_gain(config[CONF_GAIN]))
    cg.add(var.set_is_cs_package(config[CONF_IS_CS_PACKAGE]))

def to_code(config):
    var = cg.new_Pvariable(config[CONF_ID])
    yield cg.register_component(var, config)
    yield i2c.register_i2c_device(var, config)
    yield sensor.register_sensor(var, config)

    cg.add(var.set_integration_time(config[CONF_INTEGRATION_TIME]))
    cg.add(var.set_gain(config[CONF_GAIN]))
    cg.add(var.set_is_cs_package(config[CONF_IS_CS_PACKAGE]))