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7df72ddb96
* dht: Fix sensor reading from DHT22 (#239) Looking at the datasheet for DHT22, it claims to need a delay of 18ms, not 800us. Change to use the same delay as DHT11. Tested working with NodeMCUv3 and DHT22 sensor with board with built-in resistor. * dht: Add model DHT22_TYPE2 with 2ms delay instead of 0.8ms The model DHT22_TYPE2 is exactly the same as DHT22, but uses a different delay. * dht: Fix bogus negative temperature reading on DHT22_TYPE2 The workaround for negative numbers associated with DHT22s can be skipped on these sensors.
46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
import esphome.codegen as cg
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import esphome.config_validation as cv
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from esphome import pins
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from esphome.components import sensor
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from esphome.const import CONF_HUMIDITY, CONF_ID, CONF_MODEL, CONF_PIN, CONF_TEMPERATURE, \
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ICON_THERMOMETER, UNIT_CELSIUS, ICON_WATER_PERCENT, UNIT_PERCENT
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from esphome.cpp_helpers import gpio_pin_expression
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dht_ns = cg.esphome_ns.namespace('dht')
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DHTModel = dht_ns.enum('DHTModel')
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DHT_MODELS = {
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'AUTO_DETECT': DHTModel.DHT_MODEL_AUTO_DETECT,
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'DHT11': DHTModel.DHT_MODEL_DHT11,
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'DHT22': DHTModel.DHT_MODEL_DHT22,
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'AM2302': DHTModel.DHT_MODEL_AM2302,
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'RHT03': DHTModel.DHT_MODEL_RHT03,
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'SI7021': DHTModel.DHT_MODEL_SI7021,
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'DHT22_TYPE2': DHTModel.DHT_MODEL_DHT22_TYPE2,
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}
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DHT = dht_ns.class_('DHT', cg.PollingComponent)
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CONFIG_SCHEMA = cv.Schema({
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cv.GenerateID(): cv.declare_id(DHT),
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cv.Required(CONF_PIN): pins.gpio_input_pin_schema,
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cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(UNIT_CELSIUS, ICON_THERMOMETER, 1),
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cv.Optional(CONF_HUMIDITY): sensor.sensor_schema(UNIT_PERCENT, ICON_WATER_PERCENT, 0),
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cv.Optional(CONF_MODEL, default='auto detect'): cv.enum(DHT_MODELS, upper=True, space='_'),
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}).extend(cv.polling_component_schema('60s'))
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def to_code(config):
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var = cg.new_Pvariable(config[CONF_ID])
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yield cg.register_component(var, config)
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pin = yield gpio_pin_expression(config[CONF_PIN])
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cg.add(var.set_pin(pin))
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if CONF_TEMPERATURE in config:
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sens = yield sensor.new_sensor(config[CONF_TEMPERATURE])
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cg.add(var.set_temperature_sensor(sens))
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if CONF_HUMIDITY in config:
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sens = yield sensor.new_sensor(config[CONF_HUMIDITY])
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cg.add(var.set_humidity_sensor(sens))
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cg.add(var.set_dht_model(config[CONF_MODEL]))
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