Arduino as Z-Probe questions
-
@alankilian said in Arduino as Z-Probe questions:
The Z_PROBE_MOD pin is an output from the DUet tht can control a servo to deploy a BLTough for example.
Does that mean, I can use that pin, to ouput a servo pwm signal from the duet using the following configuration?
M950 S0 C"zprobe.mod" ; assign GPIO port 0 to heater3 on expansion connector, servo mode ... M280 P0 S80 ; set 80deg servo position on GPIO port 0Can I hook that pin up to the Arduino to read the signal issued by the M280 command?
-
You can do that.
Also, and maybe easier, you can just make it a PWM output and change the duty cycle of the pulses instead of reading a 1-2 millisecond high-going pulse every 20 milliseconds which is what a Servo pin will produce.
PWM and servo functions described HERE.
-
@AdrAs said in Arduino as Z-Probe questions:
I'm currently working on a project which involves an Arduino microcontroller as probe interface. Arduino is generally running on 5V. Is it possible to use it to trigger the Z_PROBE_IN pin using the Arduino? How would I go about it? And what is the Z_PROBE_MOD pin for?
Unless it's an old Duet, the Z probe input pin can tolerate up to 30V so you can connect the Arduino output to it directly.
Whether you can use Z_PROBE_MOD to control a servo depends on which Duet you have.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 I've got a Duet 2 Wifi
Unless it's an old Duet, the Z probe input pin can tolerate up to 30V so you can connect the Arduino output to it directly.
What do you consider as an old Duet?
-
Duet WiFi version 1.04 has 30V tolerance on the Z probe pin. Older Duet WiFis are not.
On Duet WiFi the Z Mod pin is not PWM capable, so it cannot be used to drive a servo.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
Many thanks for that clarification! I've got a 1.02 wifi, so I guess I need to work with resistors
-
@dc42 said in Arduino as Z-Probe questions:
Duet WiFi version 1.04 has 30V tolerance on the Z probe pin. Older Duet WiFis are not.
I've got a 1.02 WIFI, so I guess this means the Z probe pin can only handle 3.3V, right?
-
@AdrAs said in Arduino as Z-Probe questions:
I've got a 1.02 WIFI, so I guess this means the Z probe pin can only handle 3.3V, right?
Yes.
-
I learned some new stuff about the Duet series boards today!
I love days like this.
-
That's great. And I learned, that I skip all the arduino 5V conversion stuff, and just go for an ESP module for my project
More Mhz, more memory, and free WIFI I'll never use 
-
They also make 3.3 Volt Arduino-compatible boards if you want to stick with that.
(And a Trinket USB-attached Arduino, although I've had problems with trinkets before.)
-
@alankilian Thanks, they are a bit too slow though. I need at least 16 Mhz
-
@AdrAs said in Arduino as Z-Probe questions:
@alankilian Thanks, they are a bit too slow though. I need at least 16 Mhz
There are several Arduino boards that use 3.3 volts and have 16 MHz or better clock speeds.
I was looking at one the other day that had 1M of program memory, 256KB of ram and a clock speed of 64MHz.
Frederick
-
@AdrAs said in Arduino as Z-Probe questions:
@alankilian Thanks, they are a bit too slow though. I need at least 16 Mhz
There are SOME of Arduino-compatible 3.3 Volt boards that run fast available.
-
@alankilian Thanks for the list. However I couldn't find anything which is small, running on 3.3v and has >16 mhz. Nevermind though, The ESP should arrive today and suits all my needs for now.
-
@AdrAs said in Arduino as Z-Probe questions:
@alankilian Thanks for the list. However I couldn't find anything which is small, running on 3.3v and has >16 mhz. Nevermind though, The ESP should arrive today and suits all my needs for now.
Did you see this one:
No WiFi but even smaller than the ESP and runs at a respectable 64 MHz.
Frederick
-
For 3.3v Arcuino the SMT32 blue/blackpill are a good choice. Inexpensive, good documentation, support hardware debugger, support the Arduino framework, have USB C connector (e.g. for serial output), have a builtin DFU bootloader (for dongle-less field programming), and are compatible with platformio (great dev experience).
E.g.
https://www.amazon.com/Aideepen-Programming-Emulator-Downloader-STM32F103C8T6/dp/B07WRL3DF8 -
-
@dc42 I've got another question I hope you can help me.
- When are the deployprobe and retractprobe macros executed? Only when a BLTouch is connected, or for the other probe types as well?
-
@AdrAs said in Arduino as Z-Probe questions:
@dc42 I've got another question I hope you can help me.
- When are the deployprobe and retractprobe macros executed? Only when a BLTouch is connected, or for the other probe types as well?
For BLTouch they are executed before and after every probing move. For other probe types, when running G29 S0 they are executed at the start and the end of the entire probing operation. They are also executed when you run M401 and M402.
