Array for 1wire address array

Projects Programming
1

I have twenty 1wire temp sensors. Each has a unique 8 byte address. In the sample 1wire sketch, the address is stored in a typedef called DeviceAddress which is defined as in the libarary as : typedef uint8_t DeviceAddress[8];

I'd like to do something like this:

DeviceAddress tempSensorAddresses[20];  
tempSensorAddresses[0] = { 0x10, 0xD0, 0x8E, 0x6A, 0x02, 0x08, 0x00, 0xE4 };
tempSensorAddresses[1] = { 0x10, 0xD0, 0x8E, 0x6A, 0x02, 0x08, 0x00, 0xE5 };
tempSensorAddresses[2] = { 0x10, 0xD0, 0x8E, 0x6A, 0x02, 0x08, 0x00, 0xE6 };
and so on for all 20 sensors

But this doesn't work. I know I have an array of arrays, so maybe this doesn't make sense to do it this way. I'd appreciate any suggestions in how I can do this. When I read the sensors I want to do it in a loop; so looping through an array would be ideal instead if 20 lines of code to read each one.

While I'm on the subject of arrays, why doesn't this work:

byte myArray[8];
myArray = { 0x10, 0xD0, 0x8E, 0x6A, 0x02, 0x08, 0x00, 0xE4 };

But this does

byte myArray[8] = { 0x10, 0xD0, 0x8E, 0x6A, 0x02, 0x08, 0x00, 0xE4 };
2

This is a declaration

byte myArray[8] = { 0x10, 0xD0, 0x8E, 0x6A, 0x02, 0x08, 0x00, 0xE4 };

it creates the array and assigns a set of initial values to the elements.

byte myArray[8] = { 0x10, 0xD0, 0x8E, 0x6A, 0x02, 0x08, 0x00, 0xE4 };

This is an assignment it is used to set one element of the array not 8.

That the language you must learn it as you can't change it

Mark

3

Hello, recently someone asked the same question: http://arduino.cc/forum/index.php/topic,132911.0.html :slight_smile:

4

I figured it out. I created a 2 dimensional array like this:

uint8_t tempSensors[4][8] = 
{ 
{ 0x10, 0x33, 0x71, 0x6A, 0x02, 0x08, 0x00, 0x5D },
{ 0x10, 0xD0, 0x8E, 0x6A, 0x02, 0x08, 0x00, 0xE4 },
{ 0x10, 0x07, 0x91, 0x6A, 0x02, 0x08, 0x00, 0xB6 },
{ 0x10, 0x3B, 0x75, 0x6A, 0x02, 0x08, 0x00, 0xE3 } 
};

Then when I want to reference an device like this:

for(i=0; i < 4; i++)
{
  if ( sensors.isConnected(&tempSensors[i][0]) == true )  // See if device is connected
  { // Found temp sensor 
    sensors.setResolution(&tempSensors[i][0], 9);      // Set resolution to 9 bits
}