{"id":606,"date":"2015-01-11T13:34:17","date_gmt":"2015-01-11T12:34:17","guid":{"rendered":"http:\/\/www.xpablo.cz\/?p=606"},"modified":"2015-01-11T13:34:17","modified_gmt":"2015-01-11T12:34:17","slug":"cidlo-teploty-a-vlhkosti-hdc1000-a-arduino","status":"publish","type":"post","link":"http:\/\/www.xpablo.cz\/?p=606","title":{"rendered":"\u010cidlo teploty a vlhkosti HDC1000 a Arduino"},"content":{"rendered":"

\"2015-01-08_10.32.15_web_mark\"<\/a>Pot\u0159eboval jsem nahradit velmi drah\u00e9 \u010didlo teploty a relativn\u00ed vlhkosti Sensirion n\u011b\u010d\u00edm levn\u011bj\u0161\u00edm, \u00fasporn\u011bj\u0161\u00edm a p\u0159ipojiteln\u00fdm na sb\u011brnici I2C. \u010cidlo m\u011blo b\u00fdt sou\u010dasn\u011b dostupn\u00e9 u b\u011b\u017en\u011b pou\u017e\u00edvan\u00fdch distributor\u016f el. sou\u010d\u00e1stek (Farnell, SOS, Mouser, …). Po dlouh\u00e9m hled\u00e1n\u00ed jsem objevil senzor HDC1000 od TI, kter\u00fd spl\u0148oval v\u0161echny pot\u0159ebn\u00e9 parametry. Jedin\u00e1 jeho nev\u00fdhoda je pouzdro BGA, ale m\u00e1 jen 8 v\u00fdvod\u016f, co\u017e by nemuselo b\u00fdt na p\u0159ek\u00e1\u017eku. Navrhli jsme tedy a vyrobili plo\u0161n\u00fd spoj. ur\u010den\u00fd na testov\u00e1n\u00ed a nechal jsem osadit vzorek. Proto\u017ee ale je\u0161t\u011b za\u0159\u00edzen\u00ed, do kter\u00e9ho je \u010didlo ur\u010deno nen\u00ed hotov\u00e9, pou\u017eil jsem k o\u017eiven\u00ed Arduino a jako sekund\u00e1rn\u00ed v\u00fdsledek jsem napsal knihovnu pro ovl\u00e1d\u00e1n\u00ed.<\/p>\n

Arduino a senzor byly propojeny na klasick\u00e9 bastl\u00ed\u0159sk\u00e9 desti\u010dce, senzor byl p\u0159ipojen\u00fd na v\u00fdvody I2C sb\u011brnice, jak je patrn\u00e9 na obr\u00e1zku.<\/p>\n

\"IMG_8911_web\"<\/a><\/p>\n

Pro otestov\u00e1n\u00ed jsem do Arduina nahr\u00e1l zn\u00e1m\u00fd I2C scanner, abych ov\u011b\u0159il, \u017ee je \u010dip dostupn\u00fd na cel\u00e9 palet\u011b hodinov\u00fdch kmito\u010dt\u016f a tak\u00e9 abych ov\u011b\u0159il funkci adresov\u00e9ho p\u0159ep\u00edna\u010de. V\u00fdsledek, jak je vid\u011bt na dal\u0161\u00edm obr\u00e1zku, je dle o\u010dek\u00e1v\u00e1n\u00ed.<\/p>\n

\"Screenshot_2015-01-07_17.28.37\"<\/a><\/p>\n

\u010cip reaguje na v\u0161ech testovan\u00fdch kmito\u010dtech a po p\u0159epnut\u00ed p\u0159ep\u00edna\u010de m\u011bn\u00ed svoji adresu.<\/p>\n

Dal\u0161\u00edm krokem bylo vytvo\u0159en\u00ed knihovny pro obsluhu a testovac\u00edho p\u0159\u00edkladu (zdrojov\u00e9 k\u00f3dy cel\u00e9ho projektu pro Arduino CodeBlocks jsou na konci \u010dl\u00e1nku). Knihovna je napsan\u00e1 velmi spart\u00e1nsky – obsahuje minimum pot\u0159ebn\u00fdch funkc\u00ed a po\u017eaduje pouze dv\u011b funkce, poskytnut\u00e9 hlavn\u00edm programem.<\/p>\n

\/*\r\n\tHDC1000.cpp\r\n    Author: Pavel Brychta\r\n*\/\r\n\r\n#include \"hdc1000.h\"\r\n#include \r\n#include \r\n\r\n#define HDC_REG_TEMPERATURE (0x00)\r\n#define HDC_REG_HUMIDITY (0x01)\r\n#define HDC_REG_CONFIGURATION (0x02)\r\n#define HDC_REG_SERIALID1 (0xfb)\r\n#define HDC_REG_SERIALID2 (0xfc)\r\n#define HDC_REG_SERIALID3 (0xfd)\r\n#define HDC_REG_MANUFACTURERID (0xfe)\r\n#define HDC_REG_DEVICEID (0xff)\r\n\r\nvoid HDC1000_readBytes(uint8_t i2caddress, uint8_t *values, uint8_t length);\r\nvoid HDC1000_writeBytes(uint8_t i2caddress, uint8_t *values, uint8_t length);\r\n\r\nHDC1000::HDC1000(uint8_t i2caddress)\r\n{\r\n\r\n\t_device = i2caddress;\r\n}\r\n\r\nvoid HDC1000::start(void)\r\n{\r\n\tuint8_t phase1[] = {HDC_REG_CONFIGURATION, 0x10, 0x00}; \/\/ temperature & humidity, both with 14 bit resolution\r\n\/\/\tuint8_t phase1[] = {HDC_REG_CONFIGURATION, 0x30, 0x00}; \/\/ temperature & humidity, both with 14 bit resolution, HEATER ON\r\n\r\n\tHDC1000_writeBytes(_device, phase1, sizeof(phase1));\r\n}\r\n\r\nvoid HDC1000::measure(void)\r\n{\r\n\tuint8_t phase1[] = {0x00}; \/\/ start measurement\r\n\r\n\tHDC1000_writeBytes(_device, phase1, sizeof(phase1));\r\n}\r\n\r\nvoid HDC1000::readRawValues(uint16_t *rawTemp, uint16_t *rawHum)\r\n{\r\n\tuint8_t data[4];\r\n\r\n\tHDC1000_readBytes(_device, data, 4); \/\/ read raw data\r\n\t*rawTemp = ((uint16_t)data[0] << 8) + data[1];\r\n\t*rawHum = ((uint16_t)data[2] << 8) + data[3];\r\n}\r\n\r\nfloat HDC1000::convertTemp(uint16_t rawTemp)\r\n{\r\n\tfloat result;\r\n\r\n\tresult = (rawTemp \/ 65536.0) * 165.0 - 40.0;\r\n\treturn result;\r\n}\r\n\r\nfloat HDC1000::convertHum(uint16_t rawHum)\r\n{\r\n\tfloat result;\r\n\r\n\tresult = (rawHum \/ 65536.0) * 100.0;\r\n\treturn result;\r\n}\r\n\r\nuint16_t HDC1000::getManufacturerID(void)\r\n{\r\n    uint8_t phase1[] = {HDC_REG_MANUFACTURERID};\r\n    uint8_t data[2];\r\n\tuint16_t result;\r\n\r\n\tHDC1000_writeBytes(_device, phase1, sizeof(phase1)); \/\/ set pointer\r\n\tHDC1000_readBytes(_device, data, 2); \/\/ read value\r\n\tresult = (data[0] << 8) + data[1];\r\n\treturn result;\r\n}\r\n<\/pre>\n
V\u00fdsledn\u00fd test prok\u00e1zal, \u017ee \u010dip pracuje, teplotu m\u011b\u0159\u00ed spr\u00e1vn\u011b, pouze hodnota RH je \u0161patn\u011b – moje podez\u0159en\u00ed je, \u017ee kolega p\u0159i p\u00e1jen\u00ed \u010dipu pou\u017eil p\u0159\u00edli\u0161 mnoho tavidla, kter\u00e9 po\u0161kodilo kondenz\u00e1tor pro m\u011b\u0159en\u00ed vlhkosti. Uvid\u00edme, jak dopadne testov\u00e1n\u00ed s\u00e9rie, osazen\u00e9 jinou technologi\u00ed…<\/p>\n
\"Screenshot<\/a><\/p>\n
A na z\u00e1v\u011br jak jsem u\u017e uvedl – ke sta\u017een\u00ed je kompletn\u00ed projekt pro Arduino CodeBlocks IDE. Vlastn\u00ed samostatn\u00e1 knihovna je pak v adres\u00e1\u0159i libraries…<\/p>\n","protected":false},"excerpt":{"rendered":"
Pot\u0159eboval jsem nahradit velmi drah\u00e9 \u010didlo teploty a relativn\u00ed vlhkosti Sensirion n\u011b\u010d\u00edm levn\u011bj\u0161\u00edm, \u00fasporn\u011bj\u0161\u00edm a p\u0159ipojiteln\u00fdm na sb\u011brnici I2C. \u010cidlo m\u011blo b\u00fdt sou\u010dasn\u011b dostupn\u00e9 u b\u011b\u017en\u011b pou\u017e\u00edvan\u00fdch distributor\u016f el. sou\u010d\u00e1stek (Farnell, SOS, Mouser, …). Po dlouh\u00e9m hled\u00e1n\u00ed jsem objevil senzor HDC1000 od TI, kter\u00fd spl\u0148oval v\u0161echny pot\u0159ebn\u00e9 parametry. Jedin\u00e1 jeho nev\u00fdhoda je pouzdro BGA, ale … Pokra\u010dov\u00e1n\u00ed textu \u010cidlo teploty a vlhkosti HDC1000 a Arduino<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[3,5],"tags":[36,28],"class_list":["post-606","post","type-post","status-publish","format-standard","hentry","category-arduino","category-elektronika","tag-arduino","tag-hdc1000"],"_links":{"self":[{"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/posts\/606","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=606"}],"version-history":[{"count":6,"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/posts\/606\/revisions"}],"predecessor-version":[{"id":616,"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=\/wp\/v2\/posts\/606\/revisions\/616"}],"wp:attachment":[{"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=606"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=606"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.xpablo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}