# incorrect ADC values received

**URL:** <https://forums.digi.com/t/incorrect-adc-values-received/14961>\
**Category:** XBee & XBee Gateway\
**Tags:** xbee-pro-s2b, adc, xbee\
**Created:** [June 10, 2015, 9:00am UTC](https://forums.digi.com/t/incorrect-adc-values-received/14961 "2015-06-10T09:00:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![luckly123](https://avatars.discourse-cdn.com/v4/letter/l/2acd7d/32.png) [@luckly123](https://forums.digi.com/u/luckly123)\
**Post date:** [June 10, 2015, 9:00am UTC](https://forums.digi.com/t/incorrect-adc-values-received/14961/1 "2015-06-10T09:00:00Z")

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Hi,

I am using XBee Pro S2B as a coodinator and a XBee S2 as a router.

The value received is fine when only using one of the ADC.  
For example, temperature sensor LM35 returns 210 which is the correct value, but when I try to use two ADC, AD2 and AD3, the value go wrong, both of the data return is 1023.

3v voltage is used  
Temperature sensor LM35 and Light Sensor 593438 is used

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**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\
**Post date:** [June 10, 2015, 9:54am UTC](https://forums.digi.com/t/incorrect-adc-values-received/14961/2 "2015-06-10T09:54:06Z")

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Luckly123,

The sensor is a 3V Sensor correct? The maximum voltage supported on the ADC lines of the XBee ZB module is 1.2V.

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<div class="post-metadata">

**Author:** ![luckly123](https://avatars.discourse-cdn.com/v4/letter/l/2acd7d/32.png) [@luckly123](https://forums.digi.com/u/luckly123)\
**Post date:** [June 11, 2015, 8:16am UTC](https://forums.digi.com/t/incorrect-adc-values-received/14961/3 "2015-06-11T08:16:21Z")

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thanks for reply, the light sensor is actually digital output, the seller stick a analog output sticker on it…