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[dallas_temp] filter 85 temp from sensor reset (#17877)

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Co-authored-by: Samuel Sieb <samuel@sieb.net>
This commit is contained in:
Samuel Sieb
2026-09-08 13:27:49 +12:00
committed by GitHub
co-authored by Samuel Sieb
parent 639ce609bf
commit e6aa575f2e
1 changed files with 9 additions and 1 deletions
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esphome/components/dallas_temp/dallas_temp.cpp
+9 -1
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@@ -6,6 +6,7 @@ namespace esphome::dallas_temp {
static const char *const TAG = "dallas.temp.sensor";
static const uint8_t DALLAS_MODEL_DS18S20 = 0x10;
static const uint8_t DALLAS_MODEL_DS18B20 = 0x28;
static const uint8_t DALLAS_COMMAND_START_CONVERSION = 0x44;
static const uint8_t DALLAS_COMMAND_READ_SCRATCH_PAD = 0xBE;
static const uint8_t DALLAS_COMMAND_WRITE_SCRATCH_PAD = 0x4E;
@@ -154,7 +155,14 @@ float DallasTemperatureSensor::get_temp_c_() {
default:
break;
}
// undocumented test for powerup measurement of 85
// https://github.com/cpetrich/counterfeit_DS18B20#solution-to-the-85-c-problem
if ((this->address_ & 0xff) == DALLAS_MODEL_DS18B20) {
if ((temp == 85 * 16) && (this->scratch_pad_[6] == 0xc)) {
ESP_LOGD(TAG, "dropping reading caused by sensor reset");
return NAN;
}
}
return temp / 16.0f;
}