Closed AlexanderHernacki closed 1 year ago
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Did you test the latest
bugfix-2.1.xcode?Yes, and the problem still exists.
Bug Description
Issue Description: Teensy 4.1 will not read bed temperature but can successfully read extruder temperature. When asking for temperature in Pronterface, temperature is reported as -50 with custom thermistor settings and 0 with E3D thermistor settings. When flashing identical firmware with BOARD_RAMPS_14_EEB, bed temperature can be read.
Bug Timeline
This is a new bug, which I first encountered 10/1/22.
Expected behavior
When connected to Pronterface, Cura or any other interface, bed temperature should read approximately room temperature.
Actual behavior
When connected to Pronterface, Cura or any other interface, bed temperature reads either 0 C or -50 C.
Steps to Reproduce
Current Debug Process:
Measured Resistance of hot end and bed thermistors at room temp and after heating with a hair dryer. Resistances were as expected.
Switched Little Foot Thermistor to hot end pins and E3D thermistor to bed pins, still resulted in no successful reading of bed temp and successful reading of hot end temp.
Switched Teensy TEMP_0_PIN and TEMP_BED_PIN still resulted in no successful reading of bed temp and successful reading of hot end temp.
Set TEMP_SENSOR_BED to 5(E3D thermistor settings) and TEMP_SENSOR_0 to 1000(custom Little Foot thermistor settings), resulting in constant reading of 0 C for bed and normal reading for hot end.
Connected Teensy to Cura instead of Pronterface. Resulted in normal reading for hot end and constant reading of 1 C for bed
Flashed default marlin 2.1.1 with only changes to MOTHERBOARD, TEMP_SENSOR_0, and TEMP_SENSOR_BED, still resulted in no successful reading of bed temp and successful reading of hot end temp.
Flashed marlin 2.1.1 with bug fixes, with only changes to MOTHERBOARD, TEMP_SENSOR_0, and TEMP_SENSOR_BED, still resulted in no successful reading of bed temp and successful reading of hot end temp.
Flashed marlin 2.1.1 "Nightly" with bug fixes, with only changes to MOTHERBOARD, TEMP_SENSOR_0, and TEMP_SENSOR_BED, still resulted in no successful reading of bed temp and successful reading of hot end temp.
9.Fixed and arduino compiler warning in temperature.cpp for use of -Wimplicit-fallthrough by replacing it with Wextras
10.Measured voltage at Teensy Bed Temp pin, Voltage at room temp was approximately analogous to the voltage at the Extruder temp pin.
11.Enabled Pin Debugging(M43) and Pin State Control(M42), Requested full list of pins, TEMP_BED_PIN correctly assigned
12.Ran PID Calibration of hot end to verify relative functionality of Marlin(M303 E0 C8 S210), Calibration ran successfully
13.Flashed firmware in VS code instead of Arduino interface, no effect
14.Flashed firmware with Teensyduino on mac, instead of windows, no effect
15.Set TEMP_SENSOR_BED to 998( dummy 25 C constant) bed temp reported as 25 C
16.Flashed Identical firmware, only changing BOARD_TEENSY41 to BOARD_RAMPS_14_EEB onto a Arduino mega and bed temperature is successfully reported
Wiring Diagram for Test Set up
Test Set up
Version of Marlin Firmware
Marlin 2.1.1
Printer model
Custom EEB RAMPS 1.4 Printer
Electronics
Teensy 4.1 using BOARD_TEENSY41 default pin assignments. Wired to a RAMPS 1.4 board at 24 V using 2 extruder heaters in parallel and an openbuilds mini heated bed(EEB). Hot end thermistor is a E3D thermistor and the bed thermistor is a Little Foot GL104R5J thermistor.
Add-ons
N/A
Bed Leveling
No response
Your Slicer
Cura
Host Software
Pronterface
Don't forget to include
Configuration.handConfiguration_adv.h.Additional information & file uploads
Configuration files
Configuration.zip