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DHT22 ignore invalid values (#614)
Fixes https://github.com/esphome/issues/issues/397
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1 changed files with 8 additions and 1 deletions
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@ -164,11 +164,18 @@ bool HOT DHT::read_sensor_(float *temperature, float *humidity, bool report_erro
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} else {
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uint16_t raw_humidity = (uint16_t(data[0] & 0xFF) << 8) | (data[1] & 0xFF);
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uint16_t raw_temperature = (uint16_t(data[2] & 0xFF) << 8) | (data[3] & 0xFF);
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*humidity = raw_humidity * 0.1f;
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if ((raw_temperature & 0x8000) != 0)
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raw_temperature = ~(raw_temperature & 0x7FFF);
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if (raw_temperature == 1 && raw_humidity == 10) {
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if (report_errors) {
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ESP_LOGE(TAG, "Invalid temperature+humidity! Sensor reported 1°C and 1%% Hum");
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}
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return false;
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}
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*humidity = raw_humidity * 0.1f;
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*temperature = int16_t(raw_temperature) * 0.1f;
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}
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