Can't connect to my LoPy4 board
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i'm new in LoPy. i'm trying to connect my LoPy4 board to Win10 PC via USB to TTL UART serial converter. Initially it was able to be discovered, i have all driver installed. But couple of days ago i can't get it connected anymore, it keeps give me a connection error: Error_ timeout on Atom and the board is becoming pretty hot. Is there any way to recover it?
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@Liudmila-Dobriakova said in Can't connect to my LoPy4 board:
so, means what the FiPy will be dropped as well, since it's also ESP32 based? this is really pitty...
Yes. It seems that only the new F01 board will be available then, if at all.
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@Liudmila-Dobriakova Yes, connection between 3.3V and P12. But if there is no 3.3V, the device does not boot at all. Safe boot requires the device to boot first, and in a late step of the boot phase then a different software action takes place, like erasing the file system and trying to restore the alternate firmware image.
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@robert-hh so, means what the FiPy will be dropped as well, since it's also ESP32 based? this is really pitty...
another question, I was reading the manual for safe boot... i wanted to try everything before throwing away the board. to do so it is written that I have to connect the P12 and 3,3V. so basically the connected as on the foto and powered up via bridge I could keep for 7-9 sec reset button pressed and could have a chance what it wake up? could u confirm what the connection is ok?
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@Liudmila-Dobriakova In principle you can use a Fipy as well. Only it has fewer available Pins than the FiPy, since some of the pins are connected to the LTE modem. So it depends on which pins you are actually using for your applications. Just changing the pin numbers is easy.
But please use a proper mechanical set-up for the boards and the adapter.
Be aware that all esp32 based development boards by Pycom are discontinued. Stuff that is out-of-stock at a shop will never be available again. Only at Pycom itself you might place an order until the end of this month and then you might get them until the end of the year.
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@robert-hh u right, the picture was not clear, I can imagine.. .so there is nothing to bring it to life again? :( any other suggestions, or tricks?
If there is no way to recover it, I have a question then, since there are no LoPy4 boards available currently on the market I was wondering if I can use the FiPy board, but I have a script for reading the sensors data and the connection layout them and connection for LoRaWAN stack written for the LoPy4 board, would it work for FiPy board as well or I have to start from the scratch?
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@Liudmila-Dobriakova Sorry. It looked open in the picture. 2.15 V is too low for the ESP32 to work. But if the regulator gets hot, then there is a lot of current drawn. So there must be some kind of short on the board.
Not good.
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@robert-hh the blue wire is a GND
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@Liudmila-Dobriakova you have to connect GND to the board. Otherwise it is not powered.
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@robert-hh sorry, the image was made afterward, and the cables are switched in the opposite way.
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@robert-hh sorry for my ignorance, i'm doing this way, and
it shows me 2,15
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@Liudmila-Dobriakova Measure between GND and 3.3V, while the board is powered. Then, you should have 3.3V at the 3.3V pin, which is the output of the 3.3V regulator of the LoPy4.
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@robert-hh i'm a bit confused. My connection is like on foto. should I measure between GND and 3V3
or GND and VIN?
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@Liudmila-Dobriakova 4.5V at the 3.3V pin is a problem. Are you sure you are at the 3.3V? If yes, then you can consider the LoPy4 as broken.
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@robert-hh I tried with a multimeter to touch the pins from the external side and unstable can see from time to time 4,5, could it mean anything?
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@Liudmila-Dobriakova Measure with the voltmeter between the 3.3V pin and GND.
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@robert-hh how can i check it?
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@Liudmila-Dobriakova Most likely then the 3.3V regulator is broken. I guess that there is no 3.3V at the 3.3V pin.
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@robert-hh well, i can't tell for sure, but i think i never connect it to the 5V. i would say it is too hot to even touch in opposite side from the led.
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@Liudmila-Dobriakova OK. So that level is fine, when nothing is connected.
So, it looks like the Lopy4 is bricked, and I cannot tell a reason. Are you sure that you never connected the 5V from the USB adapter to the 3.3V pin of the LoPy4? That would at least explain it.
About getting hot: is is too hot to touch, especially at some places close to the LED?
