Can't connect to my LoPy4 board
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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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@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'm a bit confused. My connection is like on foto. should I measure between GND and 3V3
or GND and VIN? -
@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 sorry for my ignorance, i'm doing this way, and
it shows me 2,15 -
@robert-hh sorry, the image was made afterward, and the cables are switched in the opposite way.
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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 the blue wire is a GND
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