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* '''Info Web:''' http://seeedstudio.com/depot/one-wire-temperature-sensor-p-1235.html?cPath=25_27 * '''Techinical Spec:''' Temperature..."

2018-03-29T21:16:38Z

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=== Reference Information ===
<br />
* '''Info Web:''' http://seeedstudio.com/depot/one-wire-temperature-sensor-p-1235.html?cPath=25_27

* '''Techinical Spec:''' Temperature range: -55°C to +125°C - Accuracy: ±0.5°C( -10°C to +85°C)

* '''Connector Type:''' Base Shield V1.3 - Grove compatible - http://seeedstudio.com/depot/base-shield-v13-p-1378.html

* '''Code Source:''' http://playground.arduino.cc/Learning/OneWire

----

===Temperature Sensor - DS18B20 - (Waterproof)===
<br />
[[File:Temp probe 18B20.jpg]]

----

=== MyNbios Code - Example ===
<br />

'''In order to run this code you should copy the following code into the area delimited by the MY_BIOS CUSTOM CODE banners in the Hello_World_xxx.ino example.'''

<pre>
<nowiki>#include <OneWire.h></nowiki>

OneWire ds(3); // Arduino PIN_3

void Nearbus::MyNbios_0( byte portId, ULONG setValue, ULONG* pRetValue, byte vmcuMethod, PRT_CNTRL_STRCT* pPortControlStruct )
{
byte i;
byte present = 0;
byte type_s;
byte data[12];
byte addr[8];
float celsius, fahrenheit;

for (i=0 ; i < 20 ; i++) {
if ( ds.search(addr)) {
break;
}
ds.reset_search();
delay(250);
}
if (i == 20 ) {
*pRetValue = 0;
return;
}

if(OneWire::crc8(addr, 7) != addr[7]) {
*pRetValue = 0;
return;
}

// the first ROM byte indicates which chip
switch (addr[0]) {
case 0x10:
type_s = 1;
break;

case 0x28:
type_s = 0;
break;

case 0x22:
type_s = 0;
break;

default:
*pRetValue = 0;
return;
}
ds.reset();
ds.select(addr);
ds.write(0x44, 1); // start conversion, with parasite power on at the end
delay(1000); // maybe 750ms is enough, maybe not
present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad

for ( i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
}

int16_t raw = (data[1] << 8) | data[0];
if (type_s) {
raw = raw << 3; // 9 bit resolution default
if (data[7] == 0x10) { // "count remain" gives full 12 bit resolution
raw = (raw & 0xFFF0) + 12 - data[6];
}
}
else {
byte cfg = (data[4] & 0x60);
// at lower res, the low bits are undefined, so let's zero them
if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
// default is 12 bit resolution, 750 ms conversion time
}
celsius = (float)raw / 16.0;
fahrenheit = celsius * 1.8 + 32.0;

if ( !setValue ) { // NearAPI: [value=1] => Fahrenheit - [value=0] => Celsius
*pRetValue = (ULONG) (celsius * 100);
}
else {
*pRetValue = (ULONG) (fahrenheit * 100);
}
}
</pre>

One-Wire Temperature Sensor - DS18B20 - Revision history

Nearwiki: Created page with " === Reference Information === * '''Info Web:''' http://seeedstudio.com/depot/one-wire-temperature-sensor-p-1235.html?cPath=25_27 * '''Techinical Spec:''' Temperature..."

Nearwiki: Created page with " === Reference Information ===
* '''Info Web:''' http://seeedstudio.com/depot/one-wire-temperature-sensor-p-1235.html?cPath=25_27 * '''Techinical Spec:''' Temperature..."