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 How do you power the board?
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@robert-hh it is powered by converter via USB port, TX is connected to TX, RX-RX, GND - GND and the +5V to VIN
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@Liudmila-Dobriakova That wiring look OK. Board getting hot is not a good sign. Is it a specific component that gets hot?
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@robert-hh no other components are connected, only LoRaWAN antenna. It is heating in general, it is pretty small so it's hard to define if the heating of specific component is happened.
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@Liudmila-Dobriakova Please try to conect trough a simple robust terminal emulator program like putty, to sort out any issue with Atom and PyMakr.
For Putty, you have to set the speed to 115200, 8, N, 1, and flow control off.
Putty should at least connect, even if the LoPy does not respond. After connection, push the reset button of the LoPy4 and tell, what you get.If you cannot connect with Putty, the USB/UART bridge might be broken.
You can test that one with a loopback test. Disconnect the LoPy4 and connect TX and RX of the adapter. Then every typed character should be echoed. -
@robert-hh i'll try all what u suggest and let u know. Thank u for the suggestions so far.
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@robert-hh i've tried to connect via Putty with the standard settings u suggested, but looks like putty is not connecting too. i get this screen stacked and nothing happening if i push the reset button as well.
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@Liudmila-Dobriakova What is the result of the loopback test?
Another question: Is the blueheartbeat flash going on at the LoPy4? -
@robert-hh the second test for USB/UART bridge, i hope i get it in correct way. i've connected the pins as on foto and opening PuTTY can see all characters digied from the keyboard on the terminal. so looks like the bridge is OK, right?
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@robert-hh as a new user i can reply only every 10 min, sorry fot the delay... no lights on board
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@Liudmila-Dobriakova The bridge is OK and the Putty setting is correct.
Then there is trouble with the LoPy4 board. Which is strange, because they are quite robust usually. If you have a voltmeter, can to measure the levekl at the bridge TX output when nothing is connected? -
@Liudmila-Dobriakova Responding should now be faster. I gave you a few + flags.
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@robert-hh tanks for the flags, appreciate it! sorry, takes me a while to find a multimeter. if i'm right the red cable go to the tx pin and the black to gnd, i can see 3.3 - 3.4 V
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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? -
@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 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 how can i check it?
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@Liudmila-Dobriakova Measure with the voltmeter between the 3.3V pin and GND.
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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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