ESP8266 Community Forum

Hello,

thanks for this great book, it's really a fantastic reference book.
I use the 2015 edition, and just want to mention the following:
I built a small circuit with an ESP-12-F and use the schematic provided on page 69.
As advised I made a voltage divider for the Rx input with 22k and 10k resistors. As advised this is just in case one day I forget and connect a 5V signal instead of 3.3V.
Everything works great with my FTDI 3.3V but the problem is when nothing is connected, in this case my ESP keeps rebooting in an endless loop (every 3 or 5 seconds). I removed the divider and it's now ok: with nothing connected the ESP runs as expected.
Maybe it's just this particular ESP that I have, I didn't repeat the test with another one.
Or may be this has already been reported by others. Is this the case?

Thanks for this very very good book
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Jmp0

Having a voltage divider is good when connected to HIGH signal, but if left floating, the other resistor bring it to LOW state continuously, equivalent to BREAK signal, therefore the reaction of the ESP.

Ha! Ok
Thanks for clarification