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| author | David Crocker <dcrocker@eschertech.com> | 2020-12-27 13:23:37 +0300 |
|---|---|---|
| committer | David Crocker <dcrocker@eschertech.com> | 2020-12-27 13:23:37 +0300 |
| commit | a91af1ab9b32cf28ae9dde7b8b997ff397023c25 (patch) | |
| tree | 7959f9e02596e56a0f4bfff8b4d34a9acd0d52a8 /src/Heating | |
| parent | 1db24819be24f5c1bbc2c80f1d516cc39a051bc6 (diff) | |
| parent | c99c5be037e504775b2531c99be5c78d33f0205d (diff) | |
Merge branch 'v3.02-dev' into 3.3-dev
Diffstat (limited to 'src/Heating')
| -rw-r--r-- | src/Heating/Sensors/Thermistor.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/Heating/Sensors/Thermistor.cpp b/src/Heating/Sensors/Thermistor.cpp index 4fa8e1e0..873e4325 100644 --- a/src/Heating/Sensors/Thermistor.cpp +++ b/src/Heating/Sensors/Thermistor.cpp @@ -324,7 +324,9 @@ void Thermistor::Poll() noexcept const float recipT = shA + shB * logResistance + shC * logResistance * logResistance * logResistance; const float temp = (recipT > 0.0) ? (1.0/recipT) + ABS_ZERO : BadErrorTemperature; - if (temp < MinimumConnectedTemperature) + // It's hard to distinguish between an open circuit and a cold high-resistance thermistor. + // So we treat a temperature below -5C as an open circuit, unless we are using a low-resistance thermistor. The E3D thermistor has a resistance of about 470k @ -5C. + if (temp < MinimumConnectedTemperature && resistance > seriesR * 100) { // Assume thermistor is disconnected SetResult(ABS_ZERO, TemperatureError::openCircuit); |