Serial connection problem and connection to server failed
-
Dear all,
After unpacking the M5STAMP PICO (D4), I immediately installed the latest firmware. I then soldered it directly to a PCB. However, the blue LED remains lit during startup.
The current meter on my lab power supply repeatedly jumps back and forth (approximately 50~100mA): apparently, it is repeatedly trying to connect. The Wi-Fi mode (yellow) is working properly: I can connect to configure the Wi-Fi key.
I unsoldered GPIO pins G0 through G3 to reinstall the firmware. This doesn't work. "A serial connection cannot be established."
This problem resembles https://forum.m5stack.com/topic/7606/m5stamp-pico-solid-blue-light
However, soldering seems to be the problem here
(of course, I checked for bad connections or short circuits to pins or to components near the pads).What could I try to fix the problem? Where should I look?
Thank you in advance.
-
@RIDDSprojects any pictures of it being soldered to pcb?
-
Hi Robski,
Unfortunately, I can't show a photo due to (future) intellectual property regarding the PCB to which the module is soldered.
Thank you for your input. I'll try to explain the situation in as much detail as possible.
It was soldered manually, but professionally, and then tested for connection and short-circuiting.When connecting the USB-TTL Downloader, external hardware was disconnected from IO pins G0, G1, and G3 by desoldering solder pads elsewhere on the PCB. EN and 3V3 are not connected.
Do you have any specific questions about the PCB?
-
@RIDDSprojects just wonder if controller will show same issue out of your pcb
-
I'm going to completely desolder the Pico and then test it separately. I suspect the problem persists because nothing has been changed on the PCB. I'll post an update of my findings here.
Perhaps it's an ESD-related issue. This is the second time a similar problem has occurred with the Pico, while it hasn't happened with other controllers in a enclosure.
