ESP32 Forum

HI. Im newbie and i have a very few knowledhe of HW. I come from SW. We are trying to connect esp32 to a device implenting 1wire protocol. So 1 pin from esp32 is connected to 1-wire data device. Everything is done and working great.... but i've burnt 6 boards already and it seems that there is no reason at all!. But I suspect that it is because 1-wire data is 5v and of course esp is 3.3. So the question is...is there an easy way to connect an output pin to a 5v device? I have a buck converter just for connect esp32 to 12v/24.... but do i have to add another buck converter to 1wire pin? How?

Hi,

There's not really enough detail here to give an answer. Exactly what device(s) do you have (what ESP32 board and what is the "1-wire device"), exactly what pins are connected to what? Exactly what power sources are connected to what (and on which pins)

If you can provide photos or a diagram of the connections, someone can probably help you find the problem.

Most 1-wire devices can work at 3.3v

HI. no matter what esp32 i use...because i burnt all of them. I'm connecting esp32 to 12v/24 gps device using a bucket converter (OKI-78SR-3.3). Everything is fine at this point. When connecting one pin from esp32 to a "1-wire data pin" from gps device, which works at 5v, smoke starts appearing. The problem is that sometimes it takes a lot for smoke to appear...so that is why i realized so late of this fact (and of course because i'm absolutely a newbie).
So the product pointed by WiFive about "Bi-Directional Logic Level Converter" seems to be a good solution... i will test it tomorrow. But my question is now: is it mandatory to connect "HV" and "GND" from gps device? i mean...it will be enough just to connect any of "HVX" and "GNDX"? gps device has "1wire power" and "1wire data" pins. I dont know if i will have to use both of them or just with "1wire data" will be engough. For i-button it is only neede 1wire data (no 1wire power)

I really appreciate any comments before i burn my house with all my family inside.

Thank you

Hi slluch,

There still isn't enough information in your post for someone to help you. You mention a number of pin names but you haven't mentioned the model number of the GPS device you are using, so noone can help you. A good picture of your setup will help a lot.

Angus

chegewara wrote: ↑

Mon Feb 18, 2019 2:25 am

https://learn.sparkfun.com/tutorials/bi ... -guide/all

Hi. finally this is the solution. thank you very much!

finally chegewara got the solution with logic level converter. thank you!!