# How to use ESP8266 with Arduino UNO for WIFI connectively

**URL:** <https://forum.xod.io/t/how-to-use-esp8266-with-arduino-uno-for-wifi-connectively/6233>\
**Category:** Hardware Interfacing Questions\
**Created:** [August 24, 2022, 7:47pm UTC](https://forum.xod.io/t/how-to-use-esp8266-with-arduino-uno-for-wifi-connectively/6233 "2022-08-24T19:47:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![calleg](https://avatars.discourse-cdn.com/v4/letter/c/ba8739/32.png) [@calleg](https://forum.xod.io/u/calleg)\
**Post date:** [August 24, 2022, 7:47pm UTC](https://forum.xod.io/t/how-to-use-esp8266-with-arduino-uno-for-wifi-connectively/6233/1 "2022-08-24T19:47:38Z")

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Hello Forum!

When i started with Arduino serveral years ago it was to struggle with code-writing but now with XOD its is great!

However I ran into a problem. I was using a LoLin NodeMCU V3 as hardware but as I am to use a 5V relay and also 1-wire sensors DS18B20 with quite long cables i changed over to a Arduino UNO that is running 5V signal voltage instead of 3.3V.

The question I now have is the WiFi connection!

On the NodeMCU i used “xod-dev/esp8266-mcu/connect” and it works great.  
To the UNO I had a Adafruit CC3000 Wifi connected. But as that was not supported in XOD I purchased a ESP8266 ESP-01S card. Thinking of the “Welcome to XOD- exercise - 112-stand alone internet” that mentioning that this could be a usable way.

I thought just to change ut the node in my program to “xod-dev/esp8266/connect” instead of the one for the mcu-board.

**But how to wire the ESP8266?** I cannot find a XOD example. Is it OK to use the RX/TX pins on the Arduino or should i use other pins to keep them clear? What is the node expecting?

I also believe I need to lower the signal voltage to 3.3V with resistors, not a problem or can I connect it directly as in this example from the web? : [https://hackster.imgix.net/uploads/attachments/533124/circuit\_jRmiSWSOwQ.jpg?auto=compress%2Cformat&w=1280&h=960&fit=max](https://hackster.imgix.net/uploads/attachments/533124/circuit_jRmiSWSOwQ.jpg?auto=compress%2Cformat&w=1280&h=960&fit=max)

Hope you all understand my questions. Thanx in behalf!

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**Author:** ![calleg](https://avatars.discourse-cdn.com/v4/letter/c/ba8739/32.png) [@calleg](https://forum.xod.io/u/calleg)\
**Post date:** [September 14, 2022, 7:05am UTC](https://forum.xod.io/t/how-to-use-esp8266-with-arduino-uno-for-wifi-connectively/6233/2 "2022-09-14T07:05:09Z")

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No answers here.

But I can update that I had to move back to the NodeMCU-unit as I ran out of memory on the Arduino Uno. Works greate and for the relay coil 5 volt is available from the VU-pin that is USB-powered.

However i have a problem with the XOD cloud-store and will create a new topic for that.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex027/uploads/xod/original/1X/eb7348baa04192c2ef932d1db54d44f09f8a7888.png) [@system](https://forum.xod.io/u/system)\
**Post date:** [October 14, 2022, 7:05am UTC](https://forum.xod.io/t/how-to-use-esp8266-with-arduino-uno-for-wifi-connectively/6233/3 "2022-10-14T07:05:47Z")

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