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Xtrophic

Member Since 17 Dec 2012
Offline Last Active Jun 12 2014 08:26 PM

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#44732 Dallas 1-wire support library

Posted by Xtrophic on 01 February 2013 - 08:27 PM

Hi,

I just wanted to share the little support library I created for my temperature sensor application that deals with 1-wire operations.

The library is currently only supporting DS18S20 and DS18B20 temp sensors, but I created the library to be extendable in the future.

I had fun creating it and it seems to work pretty good. Been logging temperature for the past 2 weeks every 5 mins from 3 probes on the same line. (Although now I rewired the NP2 to attempt to get an LCD display working so it's currently offline hehe).

Also here is the code I am using to probe the temp:

OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);
OutputPort oneWirePort = new OutputPort(Pins.GPIO_PIN_D7, false);


try {               
    Microsoft.SPOT.Hardware.OneWire wire = new OneWire(oneWirePort);
    var devices = wire.FindAllDevices();
    DallasOneWireDevices collection = new DallasOneWireDevices();   // Contains type defined devices with helper commands     

    foreach (byte[] device in devices) {         
        collection.AddDevice(device);   // If supported, it will add as the correct device type it identifies it as.          
    }        

    led.Write(true); // Just lights up the led while conducting 1-wire business :)  

    // Loop through all devices, and if we find any DS18B20, then we set the resolution to 12-bit.     
    foreach (OneWireTemperatureProbe probe in collection) {      
        DeviceDS18B20 probe2 = probe as DeviceDS18B20;           
        if (probe2 != null)                     
            probe2.SetResolution(12, wire);   
    }                
    collection.SendCommandToAll(OneWireDs18b20Reference.CmdConvert, 1050, wire);    // Sends the convert command to all devices connected, and waits 1050ms   
    foreach (OneWireTemperatureProbe probe in collection) {          
        probe.ReadScratchPad(wire); // Reads the scratchpad and updates the last temperature property (which is used below)                   
        Debug.Print(probe.ToString());          
    }         
}        
catch (Exception ex)       
{      
    Debug.Print(ex.ToString());          
}        
led.Write(false);