1 | /*
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2 | ReadPrivateChannel
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3 |
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4 | Reads the latest voltage value from a private channel on ThingSpeak every 30 seconds
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5 | and prints to the serial port debug window.
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6 |
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7 | For an example of how to read from a public channel, see ReadChannel example
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8 |
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9 | ThingSpeak ( https://www.thingspeak.com ) is a free IoT service for prototyping
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10 | systems that collect, analyze, and react to their environments.
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11 |
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12 | Copyright 2016, The MathWorks, Inc.
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13 |
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14 | Documentation for the ThingSpeak Communication Library for Arduino is in the extras/documentation folder where the library was installed.
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15 | See the accompaning licence file for licensing information.
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16 | */
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17 |
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18 | #ifdef SPARK
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19 | #include "ThingSpeak/ThingSpeak.h"
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20 | #else
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21 | #include "ThingSpeak.h"
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22 | #endif
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23 |
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24 | // ***********************************************************************************************************
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25 | // This example selects the correct library to use based on the board selected under the Tools menu in the IDE.
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26 | // Yun, Wired Ethernet shield, wi-fi shield, esp8266, and Spark are all supported.
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27 | // With Uno and Mega, the default is that you're using a wired ethernet shield (http://www.arduino.cc/en/Main/ArduinoEthernetShield)
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28 | // If you're using a wi-fi shield (http://www.arduino.cc/en/Main/ArduinoWiFiShield), uncomment the line below
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29 | // ***********************************************************************************************************
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30 | //#define USE_WIFI_SHIELD
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31 | #ifdef ARDUINO_ARCH_AVR
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32 |
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33 | #ifdef ARDUINO_AVR_YUN
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34 | #include "YunClient.h"
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35 | YunClient client;
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36 | #else
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37 |
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38 | #ifdef USE_WIFI_SHIELD
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39 | #include <SPI.h>
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40 | // ESP8266 USERS -- YOU MUST COMMENT OUT THE LINE BELOW. There's a bug in the Arduino IDE that causes it to not respect #ifdef when it comes to #includes
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41 | // If you get "multiple definition of `WiFi'" -- comment out the line below.
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42 | #include <WiFi.h>
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43 | char ssid[] = "<YOURNETWORK>"; // your network SSID (name)
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44 | char pass[] = "<YOURPASSWORD>"; // your network password
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45 | int status = WL_IDLE_STATUS;
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46 | WiFiClient client;
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47 | #else
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48 | // Use wired ethernet shield
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49 | #include <SPI.h>
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50 | #include <Ethernet.h>
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51 | byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
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52 | EthernetClient client;
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53 | #endif
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54 | #endif
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55 | #endif
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56 |
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57 | #ifdef ARDUINO_ARCH_ESP8266
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58 | #include <ESP8266WiFi.h>
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59 | char ssid[] = "<YOURNETWORK>"; // your network SSID (name)
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60 | char pass[] = "<YOURPASSWORD>"; // your network password
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61 | int status = WL_IDLE_STATUS;
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62 | WiFiClient client;
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63 | #endif
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64 |
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65 | // Particle Core, Photon, and Electron the results are published to the Particle dashboard using events.
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66 | // Go to http://dashboard.particle.io, click on the logs tab, and you'll see the events coming in.
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67 | #ifdef SPARK
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68 | TCPClient client;
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69 | #endif
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70 |
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71 | /*
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72 | *****************************************************************************************
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73 | **** Visit https://www.thingspeak.com to sign up for a free account and create
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74 | **** a channel. The video tutorial http://community.thingspeak.com/tutorials/thingspeak-channels/
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75 | **** has more information. You need to change this to your channel, and your read API key
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76 | **** IF YOU SHARE YOUR CODE WITH OTHERS, MAKE SURE YOU REMOVE YOUR READ API KEY!!
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77 | *****************************************************************************************
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78 |
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79 | This is the ThingSpeak channel used in the write examples (31461). It is private, and requires a
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80 | read API key to access it. We'll read from the first field.
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81 | */
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82 | unsigned long myChannelNumber = 31461;
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83 | const char * myReadAPIKey = "NKX4Z5JGO4M5I18A";
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84 |
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85 | void setup() {
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86 | #if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_ESP8266)
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87 | Serial.begin(9600);
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88 | #ifdef ARDUINO_AVR_YUN
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89 | Bridge.begin();
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90 | #else
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91 | #if defined(USE_WIFI_SHIELD) || defined(ARDUINO_ARCH_ESP8266)
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92 | WiFi.begin(ssid, pass);
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93 | #else
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94 | Ethernet.begin(mac);
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95 | #endif
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96 | #endif
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97 | #endif
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98 |
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99 | ThingSpeak.begin(client);
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100 | }
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101 |
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102 | void loop() {
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103 | // Read the latest value from field 1 of channel 31461
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104 | float voltage = ThingSpeak.readFloatField(myChannelNumber, 1, myReadAPIKey);
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105 | #if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_ESP8266)
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106 | Serial.print("Latest voltage is: ");
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107 | Serial.print(voltage);
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108 | Serial.println("V");
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109 | #endif
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110 | #ifdef SPARK
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111 | Particle.publish("thingspeak-readvoltage", "Latest voltage is: " + String(voltage) + "V",60,PRIVATE);
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112 | #endif
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113 | delay(30000);
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114 | }
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