1 | // Sample Arduino Json Web Server
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2 | // Created by Benoit Blanchon.
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3 | // Heavily inspired by "Web Server" from David A. Mellis and Tom Igoe
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4 |
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5 | #include <SPI.h>
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6 | #include <Ethernet.h>
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7 | #include <ArduinoJson.h>
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8 |
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9 | byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
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10 | IPAddress ip(192, 168, 0, 177);
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11 | EthernetServer server(80);
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12 |
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13 | bool readRequest(EthernetClient& client) {
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14 | bool currentLineIsBlank = true;
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15 | while (client.connected()) {
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16 | if (client.available()) {
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17 | char c = client.read();
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18 | if (c == '\n' && currentLineIsBlank) {
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19 | return true;
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20 | } else if (c == '\n') {
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21 | currentLineIsBlank = true;
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22 | } else if (c != '\r') {
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23 | currentLineIsBlank = false;
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24 | }
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25 | }
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26 | }
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27 | return false;
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28 | }
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29 |
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30 | JsonObject& prepareResponse(JsonBuffer& jsonBuffer) {
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31 | JsonObject& root = jsonBuffer.createObject();
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32 |
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33 | JsonArray& analogValues = root.createNestedArray("analog");
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34 | for (int pin = 0; pin < 6; pin++) {
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35 | int value = analogRead(pin);
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36 | analogValues.add(value);
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37 | }
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38 |
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39 | JsonArray& digitalValues = root.createNestedArray("digital");
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40 | for (int pin = 0; pin < 14; pin++) {
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41 | int value = digitalRead(pin);
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42 | digitalValues.add(value);
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43 | }
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44 |
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45 | return root;
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46 | }
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47 |
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48 | void writeResponse(EthernetClient& client, JsonObject& json) {
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49 | client.println("HTTP/1.1 200 OK");
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50 | client.println("Content-Type: application/json");
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51 | client.println("Connection: close");
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52 | client.println();
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53 |
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54 | json.prettyPrintTo(client);
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55 | }
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56 |
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57 | void setup() {
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58 | Ethernet.begin(mac, ip);
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59 | server.begin();
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60 | }
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61 |
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62 | void loop() {
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63 | EthernetClient client = server.available();
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64 | if (client) {
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65 | bool success = readRequest(client);
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66 | if (success) {
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67 | StaticJsonBuffer<500> jsonBuffer;
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68 | JsonObject& json = prepareResponse(jsonBuffer);
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69 | writeResponse(client, json);
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70 | }
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71 | delay(1);
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72 | client.stop();
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73 | }
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74 | }
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