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Diffstat (limited to 'libraries/Esplora/examples/EsploraTable/EsploraTable.ino')
-rw-r--r-- | libraries/Esplora/examples/EsploraTable/EsploraTable.ino | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/libraries/Esplora/examples/EsploraTable/EsploraTable.ino b/libraries/Esplora/examples/EsploraTable/EsploraTable.ino new file mode 100644 index 0000000..73d5652 --- /dev/null +++ b/libraries/Esplora/examples/EsploraTable/EsploraTable.ino @@ -0,0 +1,219 @@ +/* + Esplora Table + + Acts like a keyboard that prints some of its sensors' + data in a table-like text, row by row. + It is a sort of "data-logger". + + At startup, it does nothing. It just waits for you to open a + spreadsheet (e.g. Google Drive spreadsheet) so it can put its + data. Then, by pressing Switch 1, it starts printing the table + headers and the first row of data. It waits a bit, then it + will print another row, and so on. + + The amount of time between each row is given by the slider. + If put to full left, the sketch will wait 10 seconds; at + full right position, it will wait 5 minutes. An intermediate + position will make the sketch wait for some time in-between. + + Clicking the Switch 1 at any time will stop the logging. + + The color LED shows what the sketch is doing: + blue = idle, waiting for you to press Switch 1 to start logging + green = active; will print soon + red = printing data to the PC + + Created on 22 november 2012 + By Enrico Gueli <enrico.gueli@gmail.com> + modified 24 Nov 2012 + by Tom Igoe +*/ + +#include <Esplora.h> + +/* + * this variable tells if the data-logging is currently active. + */ +boolean active = false; + +/* + * this variable holds the time in the future when the sketch + * will "sample" the data (sampling is the act of reading some + * input at a known time). This variable is checked continuously + * against millis() to know when it's time to sample. + */ +unsigned long nextSampleAt = 0; + +/* + * This variable just holds the millis() value at the time the + * logging was activated. This is needed to enter the correct + * value in the "Time" column in the printed table. + */ +unsigned long startedAt = 0; + + +/* + * when the "active" variable is set to true, the same is done + * with this variable. This is needed because the code that does + * the "just-after-activation" stuff is run some time later than + * the code that says "be active now". + */ +boolean justActivated = false; + + +/* + * this variable holds the last sensed status of the switch press + * button. If the code sees a difference between the value of + * this variable and the current status of the switch, it means + * that the button was either pressed or released. + */ +boolean lastStartBtn = HIGH; + +/* + * Initialization code. The virtual USB keyboard must be + * initialized; the Serial class is needed just for debugging. + */ +void setup() { + Keyboard.begin(); + Serial.begin(9600); +} + +/* + * This code is run continuously. + */ +void loop() { + /* + * note: we don't use Arduino's delay() here, because we can't + * normally do anything while delaying. Our own version lets us + * check for button presses often enough to not miss any event. + */ + activeDelay(50); + + /* + * the justActivated variable may be set to true in the + * checkSwitchPress() function. Here we check its status to + * print the table headers and configure what's needed to. + */ + if (justActivated == true) { + justActivated = false; // do this just once + printHeaders(); + // do next sampling ASAP + nextSampleAt = startedAt = millis(); + } + + if (active == true) { + if (nextSampleAt < millis()) { + // it's time to sample! + int slider = Esplora.readSlider(); + // the row below maps the slider position to a range between + // 10 and 290 seconds. + int sampleInterval = map(slider, 0, 1023, 10, 290); + nextSampleAt = millis() + sampleInterval * 1000; + + logAndPrint(); + } + + // let the RGB led blink green once per second, for 200ms. + unsigned int ms = millis() % 1000; + if (ms < 200) + Esplora.writeGreen(50); + else + Esplora.writeGreen(0); + + Esplora.writeBlue(0); + } + else + // while not active, keep a reassuring blue color coming + // from the Esplora... + Esplora.writeBlue(20); + +} + +/* + * Print the table headers. + */ +void printHeaders() { + Keyboard.print("Time"); + Keyboard.write(KEY_TAB); + activeDelay(300); // Some spreadsheets are slow, e.g. Google + // Drive that wants to save every edit. + Keyboard.print("Accel X"); + Keyboard.write(KEY_TAB); + activeDelay(300); + Keyboard.print("Accel Y"); + Keyboard.write(KEY_TAB); + activeDelay(300); + Keyboard.print("Accel Z"); + Keyboard.println(); + activeDelay(300); +} + +void logAndPrint() { + // do all the samplings at once, because keystrokes have delays + unsigned long timeSecs = (millis() - startedAt) /1000; + int xAxis = Esplora.readAccelerometer(X_AXIS); + int yAxis = Esplora.readAccelerometer(Y_AXIS); + int zAxis = Esplora.readAccelerometer(Z_AXIS); + + Esplora.writeRed(100); + + Keyboard.print(timeSecs); + Keyboard.write(KEY_TAB); + activeDelay(300); + Keyboard.print(xAxis); + Keyboard.write(KEY_TAB); + activeDelay(300); + Keyboard.print(yAxis); + Keyboard.write(KEY_TAB); + activeDelay(300); + Keyboard.print(zAxis); + Keyboard.println(); + activeDelay(300); + Keyboard.write(KEY_HOME); + + Esplora.writeRed(0); +} + +/** + * Similar to delay(), but allows to do something else + * in the meanwhile. In particular, it calls waitLoop(). + * Note 1: it may wait longer than the specified amount, not less; + * Note 2: beware of data synchronization issues, e.g. if the + * whileWaiting() function alters some variables used by the + * caller of this function. + * + * I discovered by chance that there's an ongoing discussion about + * adding yield() in the Arduino API: + * http://comments.gmane.org/gmane.comp.hardware.arduino.devel/1381 + * The purpose is the same, but for now I'm using this implementation. + */ +void activeDelay(unsigned long amount) { + unsigned long at = millis() + amount; + while (millis() < at) { + checkSwitchPress(); + } +} + +/* + * This function reads the status of the switch; if it sees that + * it was pressed, toggles the status of the "active" variable. + * If it's set to true, also the justActivated variable is set to + * true, so the loop() function above can do the right things. + * This function should be called as often as possible and do as + * little as possible, because it can be called while another + * function is running. + */ +void checkSwitchPress() { + boolean startBtn = Esplora.readButton(SWITCH_DOWN); + + if (startBtn != lastStartBtn) { + if (startBtn == HIGH) { // button released + active = !active; + if (active) + justActivated = true; + } + + lastStartBtn = startBtn; + } +} + |