HTCC-AM01: minimal Hardware Design

#1

On HTCC-AM01 Recommended hardware design I can find the design as I would like it. The question I have is regarding the comment “For AT command usage (No Arduino support)”: is there no way to upload an Arduino Sketch with that design? Does the procedure described at 1 not work?

Best regards

Joerg

I know that there is this: https://resource.heltec.cn/download/CubeCell/HTCC-AM01_Module/HTCC-AM01_Reference_Design(Arduino).pdf
Bu I do not want the CP2102 part nor the USB/Battery circuit, and the Auto-Boot circuit only if really mandatory.

1 Like
#2

yes, there is no way to upload an Arduino Sketch with that design

#3

Thank you for the clarification!

I am still not sure what the minimal design is. It looks like an FTDI converter can replace the CP2102: Can we use normal USB-UART board to communicate to Cubecell
And the battery circuit is not needed. But Auto-Boot part is still needed? Where to get DTR and RTS from (I saw CubeCell Module + Custom PCB + How to Access Bootloader , but not clear from there).

Quote of Cubecell module / unable to upload sketch (solved)

To flash CubeCell module the bootloader must be activated. 
To activate it the GPIO0 must be connected to GND during startup. 
That’s the whole secret :).
#5

yes, it still needed. where is the DTR and RTS? you can refer these:
%E5%9B%BE%E7%89%87

#6

Without the CP2102 (as I wrote) I also do not have DTR and RTS of course.

See Can we use normal USB-UART board to communicate to Cubecell

You can use a ftdi usb serial converter for 3.3v.

The use of the arduino ide or my prebuild firmware with the configurator is possible.
Use what you like :wink:
#8

You don’t need to use cp2102 and the auto-bootloader circuit we gave.

As long as you can ensure that GPIO0 is low when the cubecell is powered on. GPIO0 is disconnected from GND after power on.

#9

Great, thank you!!! I will try that when I get the modules.