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Merge pull request #396 from dhiltonp/watts

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PID in watts fixes
This commit is contained in:
Ben V. Brown
2018-10-30 16:49:30 +11:00
committed by GitHub
parent aa51dc4dbe f081f766cb
commit ab6dc6c152
1 changed files with 9 additions and 4 deletions
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13
workspace/TS100/src/main.cpp
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@@ -926,7 +926,7 @@ void startPIDTask(void const *argument __unused) {
#ifdef MODEL_TS80
idealQCVoltage = calculateMaxVoltage(systemSettings.cutoutSetting);
#endif
int32_t rawC = ctoTipMeasurement(100) - ctoTipMeasurement(101); // 1*C change in raw.
uint8_t rawC = ctoTipMeasurement(101) - ctoTipMeasurement(100); // 1*C change in raw.
currentlyActiveTemperatureTarget = 0; // Force start with no output (off). If in sleep / soldering this will
// be over-ridden rapidly
@@ -948,7 +948,10 @@ void startPIDTask(void const *argument __unused) {
// to be unstable. Use a rolling average to dampen it.
// We overshoot by roughly 1/2 of 1 degree Fahrenheit.
// This helps stabilize the display.
tempError.update(currentlyActiveTemperatureTarget - rawTemp + rawC/4);
int32_t tError = currentlyActiveTemperatureTarget - rawTemp + rawC/4;
tError = tError > INT16_MAX ? INT16_MAX : tError;
tError = tError < INT16_MIN ? INT16_MIN : tError;
tempError.update(tError);
// Now for the PID!
int32_t milliWattsOut = 0;
@@ -956,8 +959,10 @@ void startPIDTask(void const *argument __unused) {
// P term - total power needed to hit target temp next cycle.
// thermal mass = 1690 milliJ/*C for my tip.
// = Watts*Seconds to raise Temp from room temp to +100*C, divided by 100*C.
// divided by 8 to let I term dominate near set point.
const uint16_t mass = 1690 / 8;
// divided by 20 to let I term dominate near set point.
// I should retune this, but don't want to do it until
// the feed-forward temp adjustment is in place.
const uint16_t mass = 1690 / 20;
int32_t milliWattsNeeded = tempToMilliWatts(tempError.average(), mass, rawC);
milliWattsOut += milliWattsNeeded;