[136] | 1 | /*
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| 2 | Esplora Table
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| 3 |
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| 4 | Acts like a keyboard that prints sensor
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| 5 | data in a table-like text, row by row.
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| 6 |
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| 7 | At startup, it does nothing. It waits for you to open a
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| 8 | spreadsheet (e.g. Google Drive spreadsheet) so it can write
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| 9 | data. By pressing Switch 1, it starts printing the table
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| 10 | headers and the first row of data. It waits a bit, then it
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| 11 | will print another row, and so on.
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| 12 |
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| 13 | The amount of time between each row is determined by the slider.
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| 14 | If put to full left, the sketch will wait 10 seconds; at
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| 15 | full right position, it will wait 5 minutes. An intermediate
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| 16 | position will make the sketch wait for some time in-between.
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| 17 |
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| 18 | Clicking the Switch 1 at any time will stop the logging.
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| 19 |
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| 20 | The color LED shows what the sketch is doing:
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| 21 | blue = idle, waiting for you to press Switch 1 to start logging
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| 22 | green = active; will print soon
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| 23 | red = printing data to the PC
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| 24 |
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| 25 | Created on 22 november 2012
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| 26 | By Enrico Gueli <enrico.gueli@gmail.com>
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| 27 | modified 24 Nov 2012
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| 28 | by Tom Igoe
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| 29 | */
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| 30 |
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| 31 | #include <Esplora.h>
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| 32 |
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| 33 | /*
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| 34 | * this variable tells if the data-logging is currently active.
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| 35 | */
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| 36 | boolean active = false;
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| 37 |
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| 38 | /*
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| 39 | * this variable holds the time in the future when the sketch
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| 40 | * will "sample" the data (sampling is the act of reading some
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| 41 | * input at a known time). This variable is checked continuously
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| 42 | * against millis() to know when it's time to sample.
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| 43 | */
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| 44 | unsigned long nextSampleAt = 0;
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| 45 |
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| 46 | /*
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| 47 | * This variable just holds the millis() value at the time the
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| 48 | * logging was activated. This is needed to enter the correct
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| 49 | * value in the "Time" column in the printed table.
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| 50 | */
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| 51 | unsigned long startedAt = 0;
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| 52 |
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| 53 |
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| 54 | /*
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| 55 | * when the "active" variable is set to true, the same is done
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| 56 | * with this variable. This is needed because the code that does
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| 57 | * the "just-after-activation" stuff is run some time later than
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| 58 | * the code that says "be active now".
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| 59 | */
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| 60 | boolean justActivated = false;
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| 61 |
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| 62 |
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| 63 | /*
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| 64 | * this variable holds the last sensed status of the switch press
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| 65 | * button. If the code sees a difference between the value of
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| 66 | * this variable and the current status of the switch, it means
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| 67 | * that the button was either pressed or released.
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| 68 | */
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| 69 | boolean lastStartBtn = HIGH;
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| 70 |
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| 71 | /*
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| 72 | * Initialization code. The virtual USB keyboard must be
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| 73 | * initialized; the Serial class is needed just for debugging.
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| 74 | */
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| 75 | void setup() {
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| 76 | Keyboard.begin();
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| 77 | Serial.begin(9600);
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| 78 | }
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| 79 |
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| 80 | /*
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| 81 | * This code is run continuously.
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| 82 | */
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| 83 | void loop() {
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| 84 | /*
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| 85 | * note: we don't use Arduino's delay() here, because we can't
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| 86 | * normally do anything while delaying. Our own version lets us
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| 87 | * check for button presses often enough to not miss any event.
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| 88 | */
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| 89 | activeDelay(50);
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| 90 |
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| 91 | /*
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| 92 | * the justActivated variable may be set to true in the
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| 93 | * checkSwitchPress() function. Here we check its status to
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| 94 | * print the table headers and configure what's needed to.
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| 95 | */
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| 96 | if (justActivated == true) {
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| 97 | justActivated = false; // do this just once
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| 98 | printHeaders();
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| 99 | // do next sampling ASAP
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| 100 | nextSampleAt = startedAt = millis();
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| 101 | }
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| 102 |
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| 103 | if (active == true) {
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| 104 | if (nextSampleAt < millis()) {
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| 105 | // it's time to sample!
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| 106 | int slider = Esplora.readSlider();
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| 107 | // the row below maps the slider position to a range between
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| 108 | // 10 and 290 seconds.
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| 109 | int sampleInterval = map(slider, 0, 1023, 10, 290);
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| 110 | nextSampleAt = millis() + sampleInterval * 1000;
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| 111 |
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| 112 | logAndPrint();
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| 113 | }
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| 114 |
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| 115 | // let the RGB led blink green once per second, for 200ms.
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| 116 | unsigned int ms = millis() % 1000;
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| 117 | if (ms < 200)
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| 118 | Esplora.writeGreen(50);
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| 119 | else
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| 120 | Esplora.writeGreen(0);
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| 121 |
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| 122 | Esplora.writeBlue(0);
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| 123 | }
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| 124 | else
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| 125 | // while not active, keep a reassuring blue color coming
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| 126 | // from the Esplora...
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| 127 | Esplora.writeBlue(20);
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| 128 |
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| 129 | }
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| 130 |
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| 131 | /*
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| 132 | * Print the table headers.
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| 133 | */
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| 134 | void printHeaders() {
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| 135 | Keyboard.print("Time");
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| 136 | Keyboard.write(KEY_TAB);
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| 137 | activeDelay(300); // Some spreadsheets are slow, e.g. Google
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| 138 | // Drive that wants to save every edit.
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| 139 | Keyboard.print("Accel X");
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| 140 | Keyboard.write(KEY_TAB);
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| 141 | activeDelay(300);
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| 142 | Keyboard.print("Accel Y");
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| 143 | Keyboard.write(KEY_TAB);
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| 144 | activeDelay(300);
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| 145 | Keyboard.print("Accel Z");
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| 146 | Keyboard.println();
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| 147 | activeDelay(300);
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| 148 | }
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| 149 |
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| 150 | void logAndPrint() {
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| 151 | // do all the samplings at once, because keystrokes have delays
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| 152 | unsigned long timeSecs = (millis() - startedAt) / 1000;
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| 153 | int xAxis = Esplora.readAccelerometer(X_AXIS);
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| 154 | int yAxis = Esplora.readAccelerometer(Y_AXIS);
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| 155 | int zAxis = Esplora.readAccelerometer(Z_AXIS);
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| 156 |
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| 157 | Esplora.writeRed(100);
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| 158 |
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| 159 | Keyboard.print(timeSecs);
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| 160 | Keyboard.write(KEY_TAB);
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| 161 | activeDelay(300);
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| 162 | Keyboard.print(xAxis);
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| 163 | Keyboard.write(KEY_TAB);
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| 164 | activeDelay(300);
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| 165 | Keyboard.print(yAxis);
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| 166 | Keyboard.write(KEY_TAB);
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| 167 | activeDelay(300);
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| 168 | Keyboard.print(zAxis);
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| 169 | Keyboard.println();
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| 170 | activeDelay(300);
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| 171 | Keyboard.write(KEY_HOME);
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| 172 |
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| 173 | Esplora.writeRed(0);
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| 174 | }
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| 175 |
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| 176 | /**
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| 177 | * Similar to delay(), but allows the program to do something else
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| 178 | * in the meanwhile. In particular, it calls checkSwitchPress().
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| 179 | * Note 1: it may wait longer than the specified amount, not less;
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| 180 | * Note 2: beware of data synchronization issues, e.g. if the
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| 181 | * activeDelay() function alters some variables used by the
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| 182 | * caller of this function.
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| 183 | */
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| 184 | void activeDelay(unsigned long amount) {
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| 185 | unsigned long at = millis() + amount;
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| 186 | while (millis() < at) {
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| 187 | checkSwitchPress();
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| 188 | }
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| 189 | }
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| 190 |
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| 191 | /*
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| 192 | * This function reads the status of the switch; if it sees that
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| 193 | * it was pressed, toggles the status of the "active" variable.
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| 194 | * If it's set to true, also the justActivated variable is set to
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| 195 | * true, so the loop() function above can do the right things.
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| 196 | * This function should be called as often as possible and do as
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| 197 | * little as possible, because it can be called while another
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| 198 | * function is running.
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| 199 | */
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| 200 | void checkSwitchPress() {
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| 201 | boolean startBtn = Esplora.readButton(SWITCH_DOWN);
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| 202 |
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| 203 | if (startBtn != lastStartBtn) {
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| 204 | if (startBtn == HIGH) { // button released
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| 205 | active = !active;
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| 206 | if (active)
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| 207 | justActivated = true;
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| 208 | }
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| 209 |
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| 210 | lastStartBtn = startBtn;
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| 211 | }
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| 212 | }
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| 213 |
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