[Grbl_Esp32 Issue#4] Any vailable pins for SD card reader ?

#1 – DirtyEngineer 于 2018-07-26

Reference to this closed issue

Schematic is available

#2 – luc-github 于 2018-07-26

Thank you
wow as GPIO6 to 11 cannot be used because used by flash – few left but may be reusing some other could do the trick –
It may worth to try – will do later ^_^

#3 – buildlog 于 2018-07-26

Here is a snippet. I have crossed out the pins that should probably not be used.

If you don’t use some features it might be possible. Why have control buttons if you have a touch display, for example.

!image

#4 – buildlog 于 2018-07-26

BTW: I have an unconnected SD card socket on my board to experiment with.

!image

#5 – luc-github 于 2018-07-26

Hi thanks , GPIO0 can be used but must not be pull down at boot
yes a serial tft could be a way
actualy if there is a web UI no need LCD except to display the IP optionnaly (like this https://github.com/luc-github/ESP3D-WEBUI/tree/2.0 ^_^)
The best would be to add a SD card reader so ESP32 could be a host
Upload GCODE by WiFi and control/monitor by wifi
The issue with bluetooth I see is FW size (it become huge with BT lib) so either no space to host a webserver file or even to handle OTA but that may changed as I did test BT test few month ago