Stap 4: Instellen van de software - Arduino met WiFi schild
Deze stap kan of kan niet op u van toepassing, het hangt echt af op welke hardware je hebt. De Arduino board of kloon Arduino code die u met programmeren moet accepteren, maar het schild van de WiFi hebt u mei niet werken met de code ik ben ongeveer om u te tonen. Ik heb een Linksprite CC3000. De meeste CC3000 zijn gecodeerd met de dezelfde manier, je hoeft alleen te vinden van de bibliotheken die ermee werken en aanpassen van dingen binnen de belangrijkste code te laten werken. Met de Linksprite vond ik dat de Adafruit CC3000 bibliotheek perfect met mijn schild werkt en het gebeurt gewoon zo dat Adafruit IO hetzelfde bedrijf is.
TL; DR: Wordt uw WiFi schild wellicht anders worden gecodeerd en kan vereisen meer inspanning van uw kant.
Hier is de code die ik gebruikt:
#include "Adafruit_SleepyDog.h" #include "Adafruit_CC3000.h" #include "SPI.h" #include "utility/debug.h" #include "Adafruit_MQTT.h" #include "Adafruit_MQTT_CC3000.h"</p><p>int photocellPin = 0; // the cell and 10K pulldown are connected to a0</p><p>/*************************** CC3000 Pins ***********************************/</p><p>#define ADAFRUIT_CC3000_IRQ 3 // MUST be an interrupt pin! #define ADAFRUIT_CC3000_VBAT 5 // VBAT & CS can be any digital pins. #define ADAFRUIT_CC3000_CS 10 // Use hardware SPI for the remaining pins // On an UNO, SCK = 13, MISO = 12, and MOSI = 11</p><p>/************************* WiFi Access Point *********************************/</p><p>#define WLAN_SSID "---YOUR WIFI SSID (NAME)---" // can't be longer than 32 characters! #define WLAN_PASS "---YOUR WIFI PASSWORD---" #define WLAN_SECURITY WLAN_SEC_WPA2 // Can be: WLAN_SEC_UNSEC, WLAN_SEC_WEP, // WLAN_SEC_WPA or WLAN_SEC_WPA2</p><p>/************************* Adafruit.io Setup *********************************/</p><p>#define AIO_SERVER "io.adafruit.com" #define AIO_SERVERPORT 1883 #define AIO_USERNAME "---YOUR ADAFRUIT USERNAME---" #define AIO_KEY "YOUR DASHBOARDS ADAFRUIT KEY" // it's the yellow square with the key icon on your dashboard</p><p>/************ Global State (you don't need to change this!) ******************</p><p>/ Setup the main CC3000 class, just like a normal CC3000 sketch. Adafruit_CC3000 cc3000 = Adafruit_CC3000(ADAFRUIT_CC3000_CS, ADAFRUIT_CC3000_IRQ, ADAFRUIT_CC3000_VBAT);</p><p>// Store the MQTT server, username, and password in flash memory. // This is required for using the Adafruit MQTT library. const char MQTT_SERVER[] PROGMEM = AIO_SERVER; const char MQTT_USERNAME[] PROGMEM = AIO_USERNAME; const char MQTT_PASSWORD[] PROGMEM = AIO_KEY;</p><p>// Setup the CC3000 MQTT class by passing in the CC3000 class and MQTT server and login details. Adafruit_MQTT_CC3000 mqtt(&cc3000, MQTT_SERVER, AIO_SERVERPORT, MQTT_USERNAME, MQTT_PASSWORD);</p><p>// You don't need to change anything below this line! #define halt(s) { Serial.println(F( s )); while(1); }</p><p>// CC3000connect is a helper function that sets up the CC3000 and connects to // the WiFi network. See the cc3000helper.cpp tab above for the source! boolean CC3000connect(const char* wlan_ssid, const char* wlan_pass, uint8_t wlan_security);</p><p>/****************************** Feeds ***************************************</p><p>/ Setup a feed called 'photocell' for publishing. // Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname> const char PHOTOCELL_FEED[] PROGMEM = AIO_USERNAME "/feeds/photocell"; Adafruit_MQTT_Publish photocell = Adafruit_MQTT_Publish(&mqtt, PHOTOCELL_FEED);</feedname></username></p><p>/*************************** Sketch Code ************************************/</p><p>void setup() { Serial.begin(115200);</p><p> Serial.println(F("Adafruit MQTT demo"));</p><p> Serial.print(F("Free RAM: ")); Serial.println(getFreeRam(), DEC);</p><p> // Initialise the CC3000 module Serial.print(F("\nInit the CC3000...")); if (!cc3000.begin()) halt("Failed");</p><p> mqtt.subscribe(&onoffbutton);</p><p> while (! CC3000connect(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) { Serial.println(F("Retrying WiFi")); delay(1000); } } uint32_t x = analogRead(photocellPin); // This is important! This part took me forever to figure out.</p><p>// You NEED the "uint32_t x =" part if you plan on trying to add a different sensor, then just follow "x" through </p><p>// the rest of the code</p><p>void loop() { x = analogRead(photocellPin); // Make sure to reset watchdog every loop iteration! Watchdog.reset();</p><p> // Ensure the connection to the MQTT server is alive (this will make the first // connection and automatically reconnect when disconnected). See the MQTT_connect // function definition further below. MQTT_connect();</p><p> // this is our 'wait for incoming subscription packets' busy subloop Adafruit_MQTT_Subscribe *subscription; while ((subscription = mqtt.readSubscription(1000))) { if (subscription == &onoffbutton) { Serial.print(F("Got: ")); Serial.println((char *)onoffbutton.lastread); } }</p><p> // Now we can publish stuff! Serial.print(F("\nSending photocell val ")); Serial.print(x); Serial.print("..."); if (! photocell.publish(x)) { Serial.println(F("Failed")); } else { Serial.println(F("OK!")); }</p><p> // ping the server to keep the mqtt connection alive if(! mqtt.ping()) { Serial.println(F("MQTT Ping failed.")); }</p><p>}</p><p>// Function to connect and reconnect as necessary to the MQTT server. // Should be called in the loop function and it will take care if connecting. void MQTT_connect() { int8_t ret;</p><p> // Stop if already connected. if (mqtt.connected()) { return; }</p><p> Serial.print("Connecting to MQTT... ");</p><p> while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected Serial.println(mqtt.connectErrorString(ret)); if (ret < 0) CC3000connect(WLAN_SSID, WLAN_PASS, WLAN_SECURITY); // y0w, lets connect to wifi again Serial.println("Retrying MQTT connection in 5 seconds..."); mqtt.disconnect(); delay(5000); // wait 5 seconds } Serial.println("MQTT Connected!"); }
