I tried an ADC example but it didn’t seem to work properly. The MSB and LSB of the ADC just gave the same result when I hooked up Vref = 3.3V and put the ADC pin to 0 and 3.3V
Is it possible to tell me what pins exactly that need to be connected at the transmitter Xbee? Does anyone have any arduino examples for a simple ADC pin readout?
EDIT:
I messed around a bit more and I got it to work completely 
Just for my own convenience I wrote my own “Input Line Frame analyzer” so I can easily read all values on all pins whenever I like.
Here’s the code (note that [ i ] seems to have converted into italic instead of just showing that bit of code so you’ll need to remove the spaces):
float vref = 3.3;
int resolution = 1024;
float result = 0;
byte join[2] = {0,0};
int numOfBytes = 0;
int sourceAddr = 0;
int numOfSamples = 0;
int data = 0;
byte adcStatus = 0x0;
float adcVal[6] = {0,0,0,0,0,0};
byte dioStatus = 0x0;
byte dioVal = 0x0;
void setup() {
Serial.begin(9600);
}
void loop()
{
numOfBytes = 0;
sourceAddr = 0;
numOfSamples = 0;
data = 0;
adcStatus = 0x0;
for(int i = 0; i < 6; i++)
adcVal[ i ] = 0;
dioStatus = 0x0;
if(Serial.available() >= 28) // Check for at least one complete frame
if(Serial.read() == 0x7E) // Start at beginning of frame
{
Serial.print("Start Byte: 0x7E");
//-------------- Number of Bytes in Frame ---------//
Serial.print("
Nr Of Bytes: ");
join[0] = Serial.read();
Serial.print(join[0], HEX); // MSB length
Serial.print(" ");
join[1] = Serial.read();
Serial.print(join[1], HEX); // LSB length
numOfBytes = join[1] + (join[0] << 8);
Serial.print(" --> DEC Value: ");
Serial.print(numOfBytes);
//-------------- Source Address Checking ---------//
Serial.print("
Address Mode: ");
Serial.print(Serial.read(), HEX); // 83 = 16bit address
Serial.print("
Source Address: ");
join[0] = Serial.read();
Serial.print(join[0], HEX); // MSB Address
Serial.print(" ");
join[1] = Serial.read();
Serial.print(join[1], HEX); // LSB Address
sourceAddr = join[1] + (join[0] << 8);
//-------------- RSSI Checking ---------//
Serial.print("
RSSI (signal strength in -dBm): ");
Serial.print(Serial.read(), DEC);
//-------------- Number of Samples in Frame ---------//
Serial.print("
Nr of Samples: ");
join[0] = Serial.read();
Serial.print(join[0], HEX); // MSB length
Serial.print(" ");
join[1] = Serial.read();
Serial.print(join[1], HEX); // LSB length
numOfSamples = join[1] + (join[0] << 8);
Serial.print(" --> DEC Value: ");
Serial.print(numOfSamples);
//-------------- Chanel Indicator ---------//
Serial.print("
Channel Bitfield: ");
adcStatus = Serial.read();
Serial.print(adcStatus, BIN); // Neglecting D8
Serial.print(" ");
dioStatus = Serial.read();
Serial.print(dioStatus, BIN);
//-------------- Fetching Data word DIO ---------//
if(dioStatus > 0x0)
{
Serial.print("
Data DIO: ");
Serial.print(Serial.read(), BIN);
Serial.print(" ");
dioVal = Serial.read(); // Neglecting D8
Serial.print(dioVal, BIN);
Serial.print(" --> ");
for(int i = 0; i <= 7; i++)
{
Serial.print("D");
Serial.print(i);
if(bitRead(dioVal, i))
Serial.print("H");
else
Serial.print("L");
Serial.print(" ");
}
}
else
Serial.print("
No DIO data in frame");
//-------------- Fetching Data word ADC ---------//
if(adcStatus > 0x0)
{
for(int i = 1; i <= 6; i++)
{
if(bitRead(adcStatus, i))
{
//Serial.print("
Data ADC #");
//Serial.print(i);
//Serial.print(": ");
join[0] = Serial.read();
//Serial.print(join[0], BIN); // MSB Data
//Serial.print(" ");
join[1] = Serial.read();
//Serial.print(join[1], BIN); // LSB Data
data = join[1] + (join[0] << 8);
//Serial.print(" --> DEC Value: ");
//Serial.print(data);
result = (vref/resolution)*data;
adcVal[i-1] = result;
//Serial.print(" - Voltage: ");
//Serial.print(result);
}
}
Serial.print("
Data ADC: ");
for(int i = 0; i < 6; i++)
{
if(adcVal[ i ] > 0)
{
Serial.print("ADC");
Serial.print(i);
Serial.print(": ");
Serial.print(adcVal[ i ]);
Serial.print(" ");
}
}
}
else
Serial.print("
No ADC data in frame");
Serial.print("
------------------
");
}
}
which outputs, for example:
Start Byte: 0x7E
Nr Of Bytes: 0 10 --> DEC Value: 16
Address Mode: 83
Source Address: 50 0
RSSI (signal strength in -dBm): 34
Nr of Samples: 0 1 --> DEC Value: 1
Channel Bitfield: 100110 11101000
Data DIO: 0 10001000 --> D0L D1L D2L D3H D4L D5L D6L D7H
Data ADC: ADC0: 2.31 ADC1: 1.80 ADC4: 1.42
------------------
I’m open to feedback and suggestions