Another BLTouch Topic
-
@The_Mechanic said in Another BLTouch Topic:
PWM port 4 and 5 do not work.
How did you test that they do not work? Are you also using different M280 commands to reference the different pins?
-
@Phaedrux
I've sent M280 P2 S120 (BLTouch self test) through the console.
I don't change the P2 in my M280 command because the only change must be done in the config.g for the PWM port.M950 S2 C"duex.pwm4" (I've changed the '.pwm to .pwm2, 3, 4 etc.)
It works on the other ports.
The strange thing about these two PWM ports is that they have 5V (4.881 V measured with a multimeter).
There must be something wrong with the PWM signal.
-
@The_Mechanic There is a thread https://forum.duet3d.com/topic/10654/bl-touch-and-the-duex-5/65 at the posts starting 6th Nov 2019 of about PWM5 and a jumper, maybe this helps finding the reason.
-
@JoergS5
Thanks for that hint. This was a prolem I had in the past. But actually all ports do get 5V.
There must be something else wrong. -
@The_Mechanic your heater 6 is not blocked (because PWM5 and heater 6 share resources)?
Maybe your problem has something to do that your Duex 5 board has version 0.8. But I did not find something special yet (minor MOSFET ... changes).
-
@JoergS5
Don't get me wrong. It's a DueX2. I've read through these two boards and the only differences are the three TMC2660 that are not soldered. Am I right?I'm using the expansion board only because of my three z-axis, the BLTouch and two fans, that's all.
-
@The_Mechanic your image says Duex5:
Duex 2 is with 2 drivers, 5 with 5.
-
@JoergS5
Your're right. Thats wirtten on the board but it's a DueX2.M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.1.1 running on Duet WiFi 1.02 or later + DueX2
Board ID: 08DDM-9FAM2-LW4S4-6JTD6-3SJ6L-1LVRY
Used output buffers: 3 of 24 (23 max)I think thats because they share the same shematic.
-
@The_Mechanic thanks for explaining, this makes sense.
-
I've found something interesting.
@JoergS5 gave me a hint.My DueX2 is a version 0.8 and when I read the features section from the DueX2 and DueX5 I see this:
Duex 2 v0.8 and older
2 additional TMC2660 stepper motor drivers with stall notification. 2 additional extruder heater outputs. 2 servo outputs with 5V power and 5V signal levels, sharing control channels with the heaters. So you can use unused heater channels to drive servos. 2 additional endstop inputs with indicator LEDs and 3.3V/5V voltage selection. These are also usable as outputs. 6 additional PWM controlled fan outputs*, also usable for driving LEDs etc. The output voltage may be switched between 5V, 12V and VIN . 4 uncommitted general purpose I/O pins. 12V switching regulator, for generating a 12V supply for fans, LEDs etc. when the VIN power is higher than 12V. 2 additional thermistor inputs. Support for 2 more thermocouple or PT100 daughter boards, supporting up to 4 more sensors. Optional 5V external power input for powering servos, fans etc.Duex 2 v0.8a and newer
2 additional TMC2660 stepper motor drivers with stall notification. 5 additional extruder heater outputs. 5 servo outputs with 5V power and 5V signal levels, sharing control channels with the heaters. So you can use unused heater channels to drive servos. 5 additional endstop inputs with indicator LEDs and 3.3V/5V voltage selection. These are also usable as outputs. 6 additional PWM controlled fan outputs, also usable for driving LEDs etc. The output voltage may be switched between 5V, 12V and VIN . 4 uncommitted general purpose I/O pins. 12V switching regulator, for generating a 12V supply for fans, LEDs etc. when the VIN power is higher than 12V. 5 additional thermistor inputs. Support for 2 more thermocouple or PT100 daughter boards, supporting up to 4 more sensors. Optional 5V external power input for powering servos, fans etc.Now the crazy part. I have a 0.8 and not a 0.8a but I can use the servo ports 1-3. This is really strange and does not apply to any logic.
@dc42
May you could tell me where I'm wrong or misunderstand something?
