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// Read Vad owcdoADConvert(OneWireContainer26CHANNEL_VAD, state); double Vad = owcgetADVoltage(OneWireContainer26CHANNEL_VAD, state); // Read Vdd owcdoADConvert(OneWireContainer26CHANNEL_VDD, state); double Vdd = owcgetADVoltage(OneWireContainer26CHANNEL_VDD, state); return (Vad/Vdd-016)/00062; } public double getTrueRH() throws OneWireException { return getSensorRH()/(10546-000216*getTemperature()); }
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void displayData() { try { adapterbeginExclusive(true); Systemoutprintln("Temperature = "+getTemperature()+" C"); Systemoutprintln("RHsensor = "+getSensorRH()+"%"); Systemoutprintln("RHtrue = "+getTrueRH()+"%"); } catch (OneWireException owe) { Systemoutprintln(owegetMessage()); } finally { adapterendExclusive(); } } public static void main(String[] args) { try { HumiditySensor humidity = new HumiditySensor( OneWireAccessProvidergetDefaultAdapter()); humiditydisplayData(); } catch (OneWireException owe) { Systemoutprintln(owegetMessage()); } } }
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HumiditySensor nds the appropriate container during construction by invoking targetFamily on the adapter object to specify that the search should ignore all devices that are not in the DS2438 family We then know that when we invoke getFirstDeviceContianer on the adapter, it will return either an instance of OneWireContainer26 or null if no devices with family id 0x26 are discovered on the 1-Wire network The getSensorRH method uses the container to read both the supply voltage (Vout) and the voltage output of the core humidity sensor (Vad) and then uses Equation 1 to compute RH sensor The getTrueRH method invokes getSensorRH to obtain RHsensor and getTemperature to obtain a current temperature reading It then uses those two results as input to Equation 2 to compute the true relative humidity (RH true)
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The 1-Wire Net
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Running HumiditySensor on the TINI in my home of ce in the beautiful wilds of Coppell, Texas, produces the following rather unspectacular output
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Temperature = 26875C RHsensor = 45766129032258057% RHtrue = 45915238770164166%
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In this case, the relative humidity as measured by the core analog humidity sensor is not far from the true relative humidity computed taking supply voltage and temperature into account This makes sense because the temperature was close to the nominal 25 C used by the core sensor As the temperature drifts farther from 25 C in either direction, we would expect wider divergence of RH sensor from RHtrue
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The comdalsemionewireutils package contains two utility classes used exclusively for the computation and veri cation of Cyclic Redundancy Checks (CRCs) A CRC is a mathematical tool used to verify the integrity of data transferred over an unreliable communication link It is common in 1-Wire networks to have devices that are both hardwired (permanently attached) and roaming Roaming devices can cause transient short circuits on the 1-Wire bus that corrupt normal communications CRCs are employed to detect corruption in the transfer of data over the 1-Wire bus When errors are detected, the typical remedy is to retry the communication Once the condition that caused the error is gone, the operation should complete successfully Methods for the computation and veri cation of the two CRCs that are used in the data transfer layers of the 1-Wire protocol, CRC-1614 and CRC-815 are provided by the classes CRC16 and CRC8, respectively Both classes provide static utility methods only and therefore have private constructors to explicitly disallow their instantiation The following method descriptions are from the CRC8 class, but everything following applies to the CRC16 class as well The following method is the most exible of the CRC generators
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public static int compute(byte[] data, int off, int len, int seed);
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This method returns a CRC value computed over the range of bytes speci ed by [off, off+len), using the speci ed seed All of the other methods in the CRC8
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14 The CRC-16 is described mathematically by the polynomial X16 + X15 + X2 + 1 15 The 1-Wire CRC is an 8-bit CRC described mathematically by X8 + X5 + X4 + 1
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class simply provide some convenient subset of this functionality For example, the method
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public static int compute(byte[] data);
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computes the CRC over the entire byte[] using the default initial seed of 0 The example in Listing 411 computes the CRC8 of the data input using hexadecimal notation on the command line Listing 411 CRCCalculator
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import comdalsemionewireutilsCRC8; class CRCCalculator { public static void main(String[] args) { byte[] data = new byte[argslength]; for (int i = 0; i < datalength; i++) data[i] = (byte) IntegerparseInt(args[i], 16); Systemoutprintln("crc=" + IntegertoHexString(CRC8compute(data))); } }
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Running CRCCalculator using the least signi cant 56 bits of the 1-Wire address of the Thermocron on our example network
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