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Ecternal MOSFET for parasite DS18B20

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This commit is contained in:
Blaz Kristan 2023-01-18 17:36:04 +01:00
parent c6db901051
commit 1b52d8065e
1 changed files with 24 additions and 2 deletions
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26
usermods/Temperature/usermod_temperature.h
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@ -29,6 +29,7 @@ class UsermodTemperature : public Usermod {
bool degC = true;
// using parasite power on the sensor
bool parasite = false;
int8_t parasitePin = -1;
// how often do we read from sensor?
unsigned long readingInterval = USERMOD_DALLASTEMPERATURE_MEASUREMENT_INTERVAL;
// set last reading as "40 sec before boot", so first reading is taken after 20 sec
@ -53,6 +54,7 @@ class UsermodTemperature : public Usermod {
static const char _enabled[];
static const char _readInterval[];
static const char _parasite[];
static const char _parasitePin[];
//Dallas sensor quick (& dirty) reading. Credit to - Author: Peter Scargill, August 17th, 2013
float readDallas() {
@ -94,12 +96,14 @@ class UsermodTemperature : public Usermod {
DEBUG_PRINTLN(F("Requesting temperature."));
oneWire->reset();
oneWire->skip(); // skip ROM
oneWire->write(0x44,parasite); // request new temperature reading (TODO: parasite would need special handling)
oneWire->write(0x44,parasite); // request new temperature reading
if (parasite && parasitePin >=0 ) digitalWrite(parasitePin, HIGH); // has to happen within 10us (open MOSFET)
lastTemperaturesRequest = millis();
waitingForConversion = true;
}
void readTemperature() {
if (parasite && parasitePin >=0 ) digitalWrite(parasitePin, LOW); // deactivate power (close MOSFET)
temperature = readDallas();
lastMeasurement = millis();
waitingForConversion = false;
@ -175,6 +179,12 @@ class UsermodTemperature : public Usermod {
delay(25); // try to find sensor
}
}
if (parasite && pinManager.allocatePin(parasitePin, true, PinOwner::UM_Temperature)) {
pinMode(parasitePin, OUTPUT);
digitalWrite(parasitePin, LOW); // deactivate power (close MOSFET)
} else {
parasitePin = -1;
}
} else {
if (temperaturePin >= 0) {
DEBUG_PRINTLN(F("Temperature pin allocation failed."));
@ -321,6 +331,7 @@ class UsermodTemperature : public Usermod {
top["degC"] = degC; // usermodparam
top[FPSTR(_readInterval)] = readingInterval / 1000;
top[FPSTR(_parasite)] = parasite;
top[FPSTR(_parasitePin)] = parasitePin;
DEBUG_PRINTLN(F("Temperature config saved."));
}
@ -346,6 +357,7 @@ class UsermodTemperature : public Usermod {
readingInterval = top[FPSTR(_readInterval)] | readingInterval/1000;
readingInterval = min(120,max(10,(int)readingInterval)) * 1000; // convert to ms
parasite = top[FPSTR(_parasite)] | parasite;
parasitePin = top[FPSTR(_parasitePin)] | parasitePin;
if (!initDone) {
// first run: reading from cfg.json
@ -360,12 +372,21 @@ class UsermodTemperature : public Usermod {
delete oneWire;
pinManager.deallocatePin(temperaturePin, PinOwner::UM_Temperature);
temperaturePin = newTemperaturePin;
pinManager.deallocatePin(parasitePin, PinOwner::UM_Temperature);
// initialise
setup();
}
}
// use "return !top["newestParameter"].isNull();" when updating Usermod with new features
return !top[FPSTR(_parasite)].isNull();
return !top[FPSTR(_parasitePin)].isNull();
}
void appendConfigData()
{
oappend(SET_F("addInfo('")); oappend(SET_F(FPSTR(_name))); oappend(SET_F(":")); oappend(SET_F(FPSTR(_parasite)));
oappend(SET_F("',1,'<i>(if no Vcc connected)</i>');")); // 0 is field type, 1 is actual field
oappend(SET_F("addInfo('")); oappend(SET_F(FPSTR(_name))); oappend(SET_F(":")); oappend(SET_F(FPSTR(_parasitePin)));
oappend(SET_F("',1,'<i>(for external MOSFET)</i>');")); // 0 is field type, 1 is actual field
}
uint16_t getId()
@ -379,3 +400,4 @@ const char UsermodTemperature::_name[] PROGMEM = "Temperature";
const char UsermodTemperature::_enabled[] PROGMEM = "enabled";
const char UsermodTemperature::_readInterval[] PROGMEM = "read-interval-s";
const char UsermodTemperature::_parasite[] PROGMEM = "parasite-pwr";
const char UsermodTemperature::_parasitePin[] PROGMEM = "parasite-pwr-pin";