Hi, I'm new to Smoothieware. At the moment I'm remaking my Prusa I3 into a HyperCube CoreXY. in the process I'll be upgrading my Arduino based electronics to Re-ARM for RAMPS. My E3D hot end is fitted with a PT100 and amplifier and I have a question about the configuration for PT100.
temperature_control.hotend.thermistor_pin 0.23 temperature_control.hotend.pt100linear 0 # use 0 for RDT curve (alpha/beta values) temperature_control.hotend.pt100_a 0.0039083 # PT100 ALPHA value temperature_control.hotend.pt100_b 0.0000005775 # PT100 BETA value temperature_control.hotend.pt100_r0 100 # resistance at 0C temperature_control.hotend.pt100_amptype 0 # type of RTD amp, attm only 0 supported (0 is e3d pt100 amp) # coefficients for the ADC to Rt formula # q1 * ADC_VALUE / ( Q2 - Q3 * ADC_VALUE) temperature_control.hotend.pt100_q1 810000 temperature_control.hotend.pt100_q2 45409000 temperature_control.hotend.pt100_q3 280 # coefficients that are also known to work with E3D amp: #temperature_control.hotend.pt100_q1 11000000 #temperature_control.hotend.pt100_q2 606888919 #temperature_control.hotend.pt100_q3 2500
Does this config take into account any pullup attached to the thermistor pin? Or would it be better to use the RAMPS pin A3 which equates to P0.27 on the Re-ARM? RAMPS pin A3 is the pin I currently use. I have no problem with changing the pin but I'd rather not have to undo my wiring loom.