[chronojump] encoder signal generator arduino code.

[Xavier Padullés <xpadulles src gnome org>]

commit 3aa17f52b115ae98076f38a02407971069b4669c
Author: Xavier Padullés <x padulles gmail com>
Date:   Tue Apr 24 18:26:51 2018 +0200

    encoder signal generator arduino code.

 .../encoderSignalGenerator.ino                     |  118 ++++++++++++++++++++
 1 files changed, 118 insertions(+), 0 deletions(-)
---
diff --git a/arduino/encoderSignalGenerator/encoderSignalGenerator.ino 
b/arduino/encoderSignalGenerator/encoderSignalGenerator.ino
new file mode 100644
index 0000000..f791e20
--- /dev/null
+++ b/arduino/encoderSignalGenerator/encoderSignalGenerator.ino
@@ -0,0 +1,118 @@
+/*
+  signalGenerator: Generates a digital signal following different sequences defined in sequences[]
+
+  Copyright (C) 2018 Xavier de Blas xaviblas gmail com
+  Copyright (C) 2018 Xavier Padullés support chronojump org
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define   photocellA  3
+#define   photocellB  2
+#define   ledPin      13
+
+void setup() {
+  pinMode(photocellA, OUTPUT);
+  pinMode(photocellB, OUTPUT);
+  Serial.begin(115200);
+  randomSeed(analogRead(0));
+  digitalWrite(photocellA, HIGH);
+  digitalWrite(photocellB, HIGH);
+}
+
+void loop() {
+    float repRange = (int) random(10, 1000);
+    concentric(repRange,(int) random(200, 3000));
+    delay(1);
+    eccentric(repRange,(int) random(200, 3000));
+    delay(1);
+    if(random(0,1) > 0.95){
+      delay(10000);
+    }
+}
+
+//range in mm, time of the phase in ms
+void concentric(int repRange, int repTime) {
+  for (int i = 0; i < repRange; i++) {
+    encoderForward();
+    delayMicroseconds((repTime / repRange) * 1000);
+  }
+}
+
+void eccentric(int repRange, int repTime) {
+  for (int i = 0; i < repRange; i++) {
+    encoderBackward();
+    delayMicroseconds((repTime / repRange) * 1000);
+  }
+}
+
+void encoderBackward(void)
+{
+  digitalWrite(photocellB, LOW);
+  delayMicroseconds(10);
+  digitalWrite(photocellA, HIGH);
+  delayMicroseconds(90);
+  digitalWrite(photocellA, LOW);
+}
+
+void encoderForward(void)
+{
+  digitalWrite(photocellB, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(photocellA, HIGH);
+  delayMicroseconds(90);
+  digitalWrite(photocellA, LOW);
+}
+
+//
+//// https://stackoverflow.com/questions/9072320/split-string-into-string-array
+//String getValue(String data, char separator, int index)
+//{
+//  int found = 0;
+//  int strIndex[] = {
+//    0, -1
+//  };
+//  int maxIndex = data.length() - 1;
+//
+//  for (int i = 0; i <= maxIndex && found <= index; i++) {
+//    if (data.charAt(i) == separator || i == maxIndex) {
+//      found++;
+//      strIndex[0] = strIndex[1] + 1;
+//      strIndex[1] = (i == maxIndex) ? i + 1 : i;
+//    }
+//  }
+//
+//  return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
+//}
+//
+//void serialEvent()
+//{
+//  String inputString = Serial.readString();
+//  inputString = inputString.substring(0, inputString.lastIndexOf(";"));
+//  if (inputString == "start")
+//  {
+//    Serial.println("Starting signal");
+//    generateSignal = true;
+//  } else if (inputString == "stop")
+//  {
+//    generateSignal = false;
+//    Serial.println("Stoping signal");
+//  } else
+//  {
+//    Serial.println("mode = " + inputString);
+//    mode = inputString.toInt();
+//  }
+//
+//}
+