Monitor bed heating?

Elko

Hi
there is a possibility to monitor the bed heating ?
I only want to run the fan for the Mosfet of the bed heater when the bed heater is switched on

bot

Set up a thermostatic fan linked to the bed heater at a specific temperature.

see: https://duet3d.dozuki.com/Wiki/Gcode#Section_M106_Fan_On

Elko

Hello bot
I know that.
But I would like a query whether the heating is ON or OFF

Elko

void controllerfan_update() {
static millis_t lastMotorOn = 0, // Last time a motor was turned on
nextMotorCheck = 0; // Last time the state was checked
const millis_t ms = millis();
if (ELAPSED(ms, nextMotorCheck)) {
nextMotorCheck = ms + 2500UL; // Not a time critical function, so only check every 2.5s

const bool xory = X_ENABLE_READ() == X_ENABLE_ON || Y_ENABLE_READ() == Y_ENABLE_ON;

// If any of the drivers or the bed are enabled...
if (xory || Z_ENABLE_READ() == Z_ENABLE_ON
  #if HAS_HEATED_BED
    || thermalManager.temp_bed.soft_pwm_amount > 0
  #endif
    #if HAS_X2_ENABLE
      || X2_ENABLE_READ() == X_ENABLE_ON
    #endif
    #if HAS_Y2_ENABLE
      || Y2_ENABLE_READ() == Y_ENABLE_ON
    #endif
    #if HAS_Z2_ENABLE
      || Z2_ENABLE_READ() == Z_ENABLE_ON
    #endif
    #if HAS_Z3_ENABLE
      || Z3_ENABLE_READ() == Z_ENABLE_ON
    #endif
    #if E_STEPPERS
      #define _OR_ENABLED_E(N) || E##N##_ENABLE_READ() == E_ENABLE_ON
      REPEAT(E_STEPPERS, _OR_ENABLED_E)
    #endif
) {
  lastMotorOn = ms; //... set time to NOW so the fan will turn on
}

// Fan off if no steppers have been enabled for CONTROLLERFAN_SECS seconds
controllerfan_speed = (!lastMotorOn || ELAPSED(ms, lastMotorOn + (CONTROLLERFAN_SECS) * 1000UL)) ? 0 : (
  #ifdef CONTROLLERFAN_SPEED_Z_ONLY
    xory ? CONTROLLERFAN_SPEED : CONTROLLERFAN_SPEED_Z_ONLY
  #else
    CONTROLLERFAN_SPEED
  #endif
);

Elko

Just like in Marlin

dc42

Using RRF3 you could do that in the daemon.g file.

whosrdaddy

Maybe I don't understand the question well,
but when the SSR is enabled (ie the bed is heating) you can simply setup a thermostatic trigger to enable the fan like
M106 P1 T40 H0 (change P1 to your actual fan output)

whosrdaddy

@dc42 : I don't find any docs for daemon.g except for this tweet of yours