# 3 Xbee Pro S2  + Arduino

**URL:** <https://forums.digi.com/t/3-xbee-pro-s2-arduino/19362>\
**Category:** XBee - 802.15.4\
**Tags:** arduino, xbee-pro, xbee\
**Created:** [April 4, 2018, 12:09pm UTC](https://forums.digi.com/t/3-xbee-pro-s2-arduino/19362 "2018-04-04T12:09:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Alin123](https://avatars.discourse-cdn.com/v4/letter/a/aeb1de/32.png) [@Alin123](https://forums.digi.com/u/Alin123)\
**Post date:** [April 4, 2018, 12:09pm UTC](https://forums.digi.com/t/3-xbee-pro-s2-arduino/19362/1 "2018-04-04T12:09:44Z")

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Hello, guys!

I’m trying to make a star tipology using 3 Xbee Pro S2 sensors, 1 Arduino an sensors for measuring some things (temperature, humidity, air pressure and UV intensity).

First of all, I tried to make a communication between 2 Xbees (coordinator and end device).  
Both of them are configured by XCTU on AT an are connected to an laptop with an explorer shield (sparkfun).  
I opened two windows of XCTU and send frames from end device to coordinator from XCTU console (this works fine).  
I set up the End device to provide to Coordinator info on every 20 seconds.

Next step, I want to connect a sensor to End device to send the information to Coordinator every 20 seconds, but doesn’t work (I set the DIO0 pin to ADC an I connected DHT11 to this pin - I tried with Digital Input, also).

Do you have any idea what I need to do?

Thank you!

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**Author:** ![PPiera](https://avatars.discourse-cdn.com/v4/letter/p/76d3ee/32.png) [@PPiera](https://forums.digi.com/u/PPiera)\
**Post date:** [May 3, 2018, 5:04pm UTC](https://forums.digi.com/t/3-xbee-pro-s2-arduino/19362/2 "2018-05-03T17:04:57Z")

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Did you set the Coordinator in API mode?

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**Author:** ![Alin123](https://avatars.discourse-cdn.com/v4/letter/a/aeb1de/32.png) [@Alin123](https://forums.digi.com/u/Alin123)\
**Post date:** [May 4, 2018, 12:00pm UTC](https://forums.digi.com/t/3-xbee-pro-s2-arduino/19362/3 "2018-05-04T12:00:27Z")

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Yes. I did something with a LED and it is working, but I want to connect a ML8511 sensor to xbee. I configured the end device DIO0 to ADC, but I received wrong information about uvIntesity.