ESP8266 Community Forum

- Fri Jan 16, 2015 5:25 am #7425 I'm having endless problems getting the ESP to talk to the Arduino and have built a range of level shifters.

I've tried building this one:



The 5V to 3.3V works fine and I can transmit data from the Uno to the ESP.

I've tried building the 3V to 5V in the diagram and its not working. If I connect the ESP TX to directly to the Uno's RX it works fine - but put it through any kind of level shifter and it stops working.

Also tried building this one - no go.


What level shifters do you guys use that give no issues?

- Fri Jan 16, 2015 7:00 am #7433 I use a CD4050BE chip, $0.24.

- Fri Jan 16, 2015 7:11 am #7434 Thanks - might just try one of these. Tired of messing around.

- Fri Jan 16, 2015 11:05 am #7446 You need level sniffer / voltage divider only on Arduino->ESP8266 connections (Arduino TX -> ESP RX or Arduino Digital Pin -> ESP RST, etc). You don't need 3.3 to 5v "sniffer" between ESP TX and Arduino RX. I'm using divider builded on 220om and 390om resistors.