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Hello, I have a problem with a Shelly 1PM with tasmota: it started to show garbage on the console. When I connect it to the serial to usb adapter the console shows no problem, it happens only when connected to the 220V. |
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Replies: 1 comment 6 replies
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Indeed it looks like it is receiving wrong data on the serial input If the problem is that the serial RX is floating, you may be able to solve that with a pull-up on the serial connector but if you do so, don't forget to isolate it to avoid any risk of touching. |
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It seems that you have a unintended soldering between TX and RX pins. Those pins are not used in the Shelly 1PM (https://templates.blakadder.com/shelly_1PM.html). Just follow their paths to the debug connectors. Please, do that with the device NOT connected to mains. |
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That is a better solution. |
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I had not the problem, it started after a while (not sure when since it worked good. I realized it when I checked my circuit breakers and I noticed it blinked the red led without reason). So, is it possible an unintended soldering? And it only shows when connected to the 220V? |
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Maybe the case is being pressed while you put it in 220V? maybe it has some humidity or dust? Anyway, with your change in the template, you are not having the crosstalk problem anymore. |
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After several hours of debugging this issue was finally solved with the following solution: Solution for Shell 1 PM (1st Gen - round design):
Solves:
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Indeed it looks like it is receiving wrong data on the serial input
Can you double check your configuration match exactly the template and that there is no serial configuration defined.
If the problem is that the serial RX is floating, you may be able to solve that with a pull-up on the serial connector but if you do so, don't forget to isolate it to avoid any risk of touching.