Home/Support/Support Forum/Reading analog voltage on Xbee from lm34 temperature sensor

Reading analog voltage on Xbee from lm34 temperature sensor

0 votes
Hey everyone,

I have a question regarding reading analog voltage on the Xbee from lm34 temperature sensor.

I connected the circuit as such:

https://drive.google.com/open?id=0B6kkqAMmUffrcHhPQmp5NVdJTG8

**In the diagram I accidentally connected the GND pin of LM34 to VCC

My problem is that as soon as I connect the Xbee to the breakout board, the temperature readings on the Arduino increase. At room temperature I measured the output voltage of the lm34 to be 0.7V but as soon as I connect the Xbee, the output voltage of the lm34 rises to 2V.

I know normally lm34 is connected to 5V VCC but I read that Xbee analog pins take a max of 3.3V.

I am using Xbee S2C, any ideas as to why this is happening?

**The problem seems to go away when I connect the analog input to pin AD0 instead of AD3
asked Aug 22, 2017 in IEEE 802.15.4 by mikemovsi5 New to the Community (0 points)

Please log in or register to answer this question.

1 Answer

0 votes
The max voltage of an S2C if I recall is 0 - 1.2V for analog.

You are also causing a dead short by connecting VCC to GND.
answered Aug 22, 2017 by mvut Veteran of the Digi Community (11,300 points)
...