GRBHAL BTT SKR Pico V1.0 using Start/Hold pin inputs

[juansal32]

Quick question, and most likely terjeio (hey!), is this board also limited in terms or assignable inputs like the Fystec E4? It is IMMENSLY easier to upload the firmware onto it compared to the FYSTEC E4 board. I wanted to see what it was capable and its pleasing to see that the probe and estop have assigned pins. I am wondering if it pins THB (GND/1024) and TH0 (GND/1027) can be assigned as hold/start pins? I am also noticing that there is no 12v output in the 3 fan inputs on the opposite side of the USB-C port. Thanks again for the help!

[terjeio]

I am wondering if it pins THB (GND/1024) and TH0 (GND/1027) can be assigned as hold/start pins?

I am not sure and I have not tested/checked specs. The two 2.37K resistors may prevent the input to come down to a reliable low signal and is the reason I did not assign them. If shorted then they can be used.

I am also noticing that there is no 12v output in the 3 fan inputs

They are open drain outputs and function as an on/off switch to ground. There is no output on pin 2 of the connectors unless there is a load connected bewteen pin 1 and 2. The load can be a spindle motor, a relay coil, a resistor or whatever else (except a short) that draws current

[juansal32]

I understand. One more question, for the spindle control on this board, is there a PWM 0-10 volt pin? It seems the fystec e4 board has a 0-5v and 0-24v pwm (I might be wrong).

Edit: I think I'll simply get a 0-5v to 0-10v pwm booster.

[terjeio]

The spindle output is to FAN3, connect pin2 to 5V via a resistor (1K?) and you have 0-5V PWM. Connect it to 10V and you have 0-10V PWM. If you have 12V or 24V available use two resistors to form a voltage divider so you get 0-10V. Resistor values will depend on which load the PWM input on the target device presents.

[juansal32]

hey terjeio. thanks on the help with my build above. I have another request if possible. The machine I am currently building is using the same board (btt pico skr v1) as above. However this machine will be using the ganged auto square build from the grblhal webbuilder build. But when using this build, there is no pin for the estop/halt/reset. In the build for single motor, is uses pin 1016 on the btt board for the estop, in the auto square build, it uses the same pin (1016) as the 2nd limit switch for the 2nd y axis motor. is there a way to have the estop be assign to pin 1024 on the btt board or another available pin? Thank you so much! u rock!

[terjeio]

Latest commit uses the Servo port (GPIO 29) in four motor configurations. Note that the input does not have any signal conditioning so you should add some yourself (RC-filter or optocoupler) to prevent damage to the MCU.