[Grbl_Esp32 Issue#320] Opnion and help in my Board design based on version 3.1

Hello all!

I am new in the forum so I don’t know if here is the correct place to do that or if I can do that, but I did my version from the board ESP32 CNC Controller V3.1, I changed and fixed some pins as I though that is better for my needs and also change some components to buy from the same supplier ( Board – JLCPCB and Components – LCSC). I stop following the forum for a while and now I realize that the software and also the board change a lot, I think that the board actually is V4.1 .

By the way, I’d like your opinion about my Schema and also Board design, I send this to be produced and I will assemble and test it as soom it arrive. I hope that it work.

Here is the schematic and a 3d model picture.

kicad ESP32 CNC-V4 – Schematic.pdf

!TOP

I did the tracks in the board to work at 5 Amps and choose one Step down converter to work at 45V – 3A.

Step down converter TD1509P5: https://lcsc.com/product-detail/DC-DC-ConvertersTechcode-Semicon-TD1509P5C97262.html

The idea for use this current is because Pololu have one step motor driver that have max current per phase 4,5A. I think that with this driver is possible use bigger step motors.

Pololu driver TB67S249FTG Stepper Motor Driver Compact Carrier https://www.pololu.com/product/3096

If is possible also can you help me with the pins map in the file cpu_map.h. I had a lot of questions before, now it is bigger so I’m a bit confused.

I choose the version V3p5 to configure, I will use only one pin for coolant MIST and FLOOD, negative and positive Normally Open limits switch for all axis, spindle direction and SD_card detection.

Choose the version of the board to better Pins configurations:
Line 73 – //#define CPUMAPV3p5 // version 3.5 and earlier to #define CPUMAPV3p5 // version 3.5 and earlier

Line 74 – #define CPUMAPV4 // version 4 or higher (in developement) to //#define CPUMAPV4 // version 4 or higher (in developement)

Coolant configuration:
Line 96 – //#define COOLANTFLOODPIN GPIONUM16 to #define COOLANTFLOODPIN GPIONUM16

Line 116 – //#define COOLANTMISTPIN   GPIONUM21 to //#define COOLANTMISTPIN   GPIONUM16

Limits axis switch configuration:
If I’m not wrong the old version of cpu_map.h had a way to configure the software to work with positive and negative limits switch, but I didn’t find this in the actual file. Is possible use negative and positive switch in the machine?
To change the switch from NC to NO I need just change the mask, is it correct?

Line 127 – #define LIMITMASK      B111 to #define LIMITMASK      B000

SPINDLE_DIR configuration:
I didn’t find any configuration for spindle direction and I don’t know what is the function to USERDIGITALPIN_1. Is possible use this to control the spindle direction, the software give conditions to do that?

Line 117 – #define USERDIGITALPIN1 GPIONUM21 to //#define SPINDLEDIRPIN GPIONUM_21

– There is no //#define SPINDLEDIRPIN GPIONUM21, it is just one example for possible variable.

SD_CARD configuration:
I fixed the pins for the SD card, But I don’t know how can I read that (I need learn program yet). If I understood correct the files, actually the software read SD card and use GPIOs 5, 18, 19 and 23, but I don’t know each pin is used as SD Card detect, I choose GPIO 35. It will work or there ins’t pin for that in the software?

Line131 – #define CONTROLSAFETYDOORPIN   GPIONUM35  // needs external pullup to //#define SDCARDDETECTPIN   GPIONUM35  // needs external pullup

– Also there is no //#define SDCARDDETECTPIN GPIONUM_35 // needs external pullup, it is just one example for possible variable.

These are what I think that is necessary change in the file, I didn’t find any thing more, but I am not sure if these are correct or possible to change.

Thanks,

Antonio.