1+ // Adafruit IO Publish & Subscribe, Digital Input and Output Example
2+ //
3+ // Adafruit invests time and resources providing this open source code.
4+ // Please support Adafruit and open source hardware by purchasing
5+ // products from Adafruit!
6+ //
7+ // Written by Todd Treece for Adafruit Industries
8+ // Modified by Brent Rubell for Adafruit Industries
9+ // Copyright (c) 2020 Adafruit Industries
10+ // Licensed under the MIT license.
11+ //
12+ // All text above must be included in any redistribution.
13+
14+ /* ************************* Configuration ***********************************/
15+
16+ // edit the config.h tab and enter your Adafruit IO credentials
17+ // and any additional configuration needed for WiFi, cellular,
18+ // or ethernet clients.
19+ #include " config.h"
20+
21+ /* *********************** Example Starts Here *******************************/
22+
23+ // Button Pin
24+ #define BUTTON_PIN 0
25+
26+ // LED Pin
27+ #define LED_PIN LED_BUILTIN
28+
29+ // button state
30+ bool btn_state = false ;
31+ bool prv_btn_state = false ;
32+
33+ // set up the 'led' feed
34+ AdafruitIO_Feed *led = io.feed(" led"
35+
36+ // set up the 'button' feed
37+ AdafruitIO_Feed *button = io.feed(" button"
38+
39+ void setup () {
40+
41+ // set button pin as an input
42+ pinMode (BUTTON_PIN, INPUT);
43+
44+ // set LED pin as an output
45+ pinMode (LED_PIN, OUTPUT);
46+
47+ // start the serial connection
48+ Serial.begin (115200 );
49+
50+ // wait for serial monitor to open
51+ while (! Serial);
52+
53+ Serial.print (" Connecting to Adafruit IO"
54+
55+ // connect to io.adafruit.com
56+ io.connect ();
57+
58+ // set up a message handler for the count feed.
59+ // the handleMessage function (defined below)
60+ // will be called whenever a message is
61+ // received from adafruit io.
62+ led->onMessage (handleMessage);
63+
64+ // wait for a connection
65+ while (io.status () < AIO_CONNECTED) {
66+ Serial.print (" ."
67+ delay (500 );
68+ }
69+
70+ // we are connected
71+ Serial.println ();
72+ Serial.println (io.statusText ());
73+ led->get ();
74+
75+ }
76+
77+ void loop () {
78+
79+ // io.run(); is required for all sketches.
80+ // it should always be present at the top of your loop
81+ // function. it keeps the client connected to
82+ // io.adafruit.com, and processes any incoming data.
83+ io.run ();
84+
85+ // grab the btn_state state of the button.
86+ if (digitalRead (BUTTON_PIN) == LOW)
87+ btn_state = false ;
88+ else
89+ btn_state = true ;
90+
91+ // return if the btn state hasn't changed
92+ if (btn_state == prv_btn_state)
93+ return ;
94+
95+ // save the btn_state state to the 'button' feed on adafruit io
96+ Serial.print (" sending button -> " println (btn_state);
97+ button->save (btn_state);
98+
99+ // store last button state
100+ prv_btn_state = btn_state;
101+
102+ }
103+
104+ // this function is called whenever a 'led' message
105+ // is received from Adafruit IO. it was attached to
106+ // the counter feed in the setup() function above.
107+ void handleMessage (AdafruitIO_Data *data) {
108+ Serial.print (" received <- "
109+
110+ if (data->toPinLevel () == HIGH)
111+ Serial.println (" HIGH"
112+ else
113+ Serial.println (" LOW"
114+
115+ digitalWrite (LED_PIN, data->toPinLevel ());
116+ }
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