Difference between pages "File:Nearbus 28J60 0.jpg" and "One-Wire Temperature Sensor - DS18B20"
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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> |
Latest revision as of 21:16, 29 March 2018
Reference Information
- 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)
MyNbios Code - Example
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.
#include <OneWire.h> 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); } }
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