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DHT22 ignore invalid values (#614)

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Fixes https://github.com/esphome/issues/issues/397
This commit is contained in:
Otto Winter 2019-06-06 13:13:28 +02:00
parent c6e3f1bca6
commit aacb9e44e8
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GPG key ID: DB66C0BE6013F97E
1 changed files with 8 additions and 1 deletions
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9
esphome/components/dht/dht.cpp
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@ -164,11 +164,18 @@ bool HOT DHT::read_sensor_(float *temperature, float *humidity, bool report_erro
} else { } else {
uint16_t raw_humidity = (uint16_t(data[0] & 0xFF) << 8) | (data[1] & 0xFF); uint16_t raw_humidity = (uint16_t(data[0] & 0xFF) << 8) | (data[1] & 0xFF);
uint16_t raw_temperature = (uint16_t(data[2] & 0xFF) << 8) | (data[3] & 0xFF); uint16_t raw_temperature = (uint16_t(data[2] & 0xFF) << 8) | (data[3] & 0xFF);
*humidity = raw_humidity * 0.1f;
if ((raw_temperature & 0x8000) != 0) if ((raw_temperature & 0x8000) != 0)
raw_temperature = ~(raw_temperature & 0x7FFF); raw_temperature = ~(raw_temperature & 0x7FFF);
if (raw_temperature == 1 && raw_humidity == 10) {
if (report_errors) {
ESP_LOGE(TAG, "Invalid temperature+humidity! Sensor reported 1°C and 1%% Hum");
}
return false;
}
*humidity = raw_humidity * 0.1f;
*temperature = int16_t(raw_temperature) * 0.1f; *temperature = int16_t(raw_temperature) * 0.1f;
} }