Xbee S2 with DHT22

XBee & XBee Gateway XBee - Zigbee
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Hi Folks,

I have just started experimenting with Xbee radios and I have hit the wall. Here, is my project story.

I am trying to receive Temperature and Humidity data from remote

  • XBee-S2 (Router AT)
  • Connected with DHT22 (on pin AD0)
  • For level shifting I have connected 1k resistor from PIN-2 to PIN-1

Coordinator:

  • Arduino UNO
  • XBee S2 (Setup as Coordinator API)
  • Pins connected
    XBee TX to Arduino RX
    XBee RX to Arduino TX

Code on receiver side (simple)

void setup()
{
Serial.begin(9600);
}
void loop()
{
if (Serial.available()>=21){
for(int i=0;i<26;i++){
Serial.print(Serial.read(),HEX);
Serial.print(“-”);
}
Serial.print(“,”);
Serial.println();
}
}

The output that I receive on Ardunio IDE Serial Monitor is :
7E-0-12-92-0-13-A2-0-40-F9-69-94-A-4F-1-1-0-1-0-0-1-FFFFFFFF-FFFFFFFF-25-FFFFFFFF-FFFFFFFF-,
7E-0-12-92-0-13-A2-0-40-F9-69-94-A-4F-1-1-0-1-0-0-1-FFFFFFFF-FFFFFFFF-25-FFFFFFFF-FFFFFFFF-,
7E-0-12-92-0-13-A2-0-40-F9-69-94-A-4F-1-1-0-1-0-0-1-FFFFFFFF-FFFFFFFF-25-FFFFFFFF-FFFFFFFF-,

Questions:

  1. The first 20 bytes, they are correct and I understood what they are
  2. From 21st byte, I am not sure what and why they are as displayed

Appreciate your help and guidance.

  • Vijay