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1 void setup() {
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2
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3 pinMode(2, INPUT);
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4 digitalWrite(2, LOW);
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5 // PIR sensor on here is a
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6 // http://octopart.com/555-28027-parallax-708653 in a
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7 // http://octopart.com/1551ggy-hammond-15686 box
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8
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9 // the phototransistor on analog2 is jameco 2006414
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10
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11 Serial.begin(115200);
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12 }
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13
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14 int newBlinks = 0;
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15 int lastLevel = 0;
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16 int threshold = 750;
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17 int hold = 3; // pulse must last this many loops. Guessing-- I don't know the loop rate or the pulse width
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18 int seenFor = 0;
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19
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20 void loop()
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21 {
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22 unsigned char head, cmd, arg;
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23 int level = analogRead(3) < threshold;
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24
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25 if (level) {
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26 seenFor++;
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27 if (seenFor == hold) {
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28 newBlinks++;
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29 }
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30 } else {
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31 seenFor = 0;
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32 }
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33
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34 if (Serial.available() >= 3) {
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35 head = Serial.read();
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36 if (head != 0x60) {
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37 Serial.flush();
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38 return;
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39 }
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40 cmd = Serial.read();
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41 arg = Serial.read();
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42 Serial.flush();
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43 if (cmd == 0x00) {
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44 Serial.print("{\"ok\":true}\n");
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45 } else if (cmd == 0x01) { // poll
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46 Serial.print("{\"newBlinks\":");
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47 Serial.print(newBlinks);
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48 Serial.print(", \"motion\":");
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49 Serial.print(digitalRead(2) ? "true" : "false");
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50 Serial.print("}\n");
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51 newBlinks = 0;
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52 } else if (cmd == 0x02) {
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53 // current level
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54 Serial.print("{\"z\":");
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55 Serial.print(analogRead(3));
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56 Serial.print("}\n");
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57 } else if (cmd == 0x03) {
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58 if (arg != 0) {
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59 threshold = arg << 2;
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60 }
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61 Serial.print("{\"threshold\":");
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62 Serial.print(threshold);
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63 Serial.print("}\n");
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64 }
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65 }
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66 }
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67
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68
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