Home/Support/Support Forum/XBee temperature sensor problem

XBee temperature sensor problem

0 votes
I would like to know how to read correctly data from XBee analog input (AD0) where I have and LM35.

I show the results in a GLCD but they are wrong. I think I am not reading correctly the data.

This is the loop code:

void loop()
if (Serial.available() >= 21)
if (Serial.read() == 0x7E)
for (int i = 0; i<18; i++)
byte discard = Serial.read();
// Copy analog samples
int analogHigh = Serial.read();
int analogLow = Serial.read();
int analogValue = analogLow + (analogHigh*256);
temp = (analogValue*1200.0)/1023.0;
temp = temp/10;
GLCD.print("C = ");
}// if start
}// if available

Thank you in advance
asked Oct 27, 2014 in RF Solutions and XBee by Ferrerovi New to the Community (3 points)

Please log in or register to answer this question.

1 Answer

0 votes
You need to use a level shifter between the sensor and the XBee modules ADC line as the XBee's ADC line supports 0 - 1.2V and your sensor supports 4 - 30 V.
answered Oct 29, 2014 by mvut Veteran of the Digi Community (15,323 points)