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  • NoseyNick commented on TonesB's instructable ESP8266 WiFi Module for Dummies3 months ago
    ESP8266 WiFi Module for Dummies

    There's a long discussion somewhere else, hackaday I think, where someone fairly official like the CEO of Espressif Systems publicly stated that the GPIO/UART pins on the ESP8266 ARE 5V tolerant. Someone else did some further tests, at many voltages, measuring current and similarly concluded that you OUGHT to be OK.As long as your SUPPLY doesn't go above about 3.3V, you are theoretically OK putting 5V signals on TX/RX.THEORETICALLY. Note that I am NOT going to pay for your fried ESPs :-pMy personal advice:A 3.3V OUTPUT should go OK into a 5V INPUT and still be seen as fairy reliably logic 0/1, so ESP TX --> 5V programmer RX, just wire it fine. 3.3V is above "about 2.5V" so is still considered a "high".A 5V output into a 3.3V input would USUALLY be a bad idea (ign...see more »There's a long discussion somewhere else, hackaday I think, where someone fairly official like the CEO of Espressif Systems publicly stated that the GPIO/UART pins on the ESP8266 ARE 5V tolerant. Someone else did some further tests, at many voltages, measuring current and similarly concluded that you OUGHT to be OK.As long as your SUPPLY doesn't go above about 3.3V, you are theoretically OK putting 5V signals on TX/RX.THEORETICALLY. Note that I am NOT going to pay for your fried ESPs :-pMy personal advice:A 3.3V OUTPUT should go OK into a 5V INPUT and still be seen as fairy reliably logic 0/1, so ESP TX --> 5V programmer RX, just wire it fine. 3.3V is above "about 2.5V" so is still considered a "high".A 5V output into a 3.3V input would USUALLY be a bad idea (ignoring my first paragraph) but 5V/2 = 2.5V, comfortably below 3.3V but also comfortably above the 1.7V(ish) that ought to be considered "high", so build yourself a simple voltage divider with 2 identical resistors, say, 5k [here's hoping instructables doesn't eat my ASCII art]:GND ---[R]--- ESP RX ---[R]--- Programmer TXYou could do even better by working out the "correct" ratio of 2 DIFFERENT resistors, or something even more cunning with a resistor and a zenner - these are left as an exercise for the reader ;-)

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  •  Unusual Life Hacks Of Super Strong Neodymium Magnet

    "all laptop have a hall effect sensor" - no, some have a very physical microswitch, either near the hinge or built into a mechanical latch.... but if your laptop is one of those that snaps shut magnetically, chances are you can sleep it magnetically too.

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