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--- projets:antennes:robotized_mag_loop:index [2021/05/13 12:01] – f1sls
+++ projets:antennes:robotized_mag_loop:index [2021/05/16 18:56] (Version actuelle) – [LIBS] f1sls
@@ Ligne 43: / Ligne 43: @@
 {{:projets:antennes:robotized_mag_loop:uln2003_driver_board.jpg?direct&200|}}
+{{:projets:antennes:robotized_mag_loop:uln2003-stepper-motor-driver-pinout.png?direct|}}
 === ULN2003 DATASHEET ===
 {{ :projets:antennes:robotized_mag_loop:uln2003-datasheet.pdf |}}
-===== SCHEMATICS =====
+{{:projets:antennes:robotized_mag_loop:uln2003-datasheet-pinout-circuit-diagram-proteus-simulation.png?direct&400|}}
+=== ULN2003 DRIVER BOARD DATASHEET ===
+{{ :projets:antennes:robotized_mag_loop:uln2003-stepper-motor-driver-pcb.pdf |}}
+===== STEPPER CONTROL SCHEMATICS =====
 {{:projets:antennes:robotized_mag_loop:28byj-48-stepper-motor-uln2003-driver-wiring-diagram-schematic-pinout-1024x482.jpg?direct&600|}}
+==== POSITION READING ====
+<WRAP center round info 60%>
+We are using a 250k potentiometer to read the position of the stepper-motor / variable capacitor. We must avoid to go below the 0 position of the variable capacitor (fully open, minimum capacitance) and avoid to go over the 100% position of the variable capacitor (fully closed, maximum capacitance).
+</WRAP>
+{{:projets:antennes:robotized_mag_loop:arduino_potentiometer_reading_01.png?direct&600|}}
+{{:projets:antennes:robotized_mag_loop:arduino_potentiometer_reading_02.png?direct&600|}}
+<code cpp>
+/* Analog Read to LED
+ * ------------------
+ *
+ * turns on and off a light emitting diode(LED) connected to digital
+ * pin 13. The amount of time the LED will be on and off depends on
+ * the value obtained by analogRead(). In the easiest case we connect
+ * a potentiometer to analog pin 2.
+ *
+ * Created 1 December 2005
+ * copyleft 2005 DojoDave <http://www.0j0.org>
+ * http://arduino.berlios.de
+ *
+ */
+int potPin = 2;    // select the input pin for the potentiometer
+int ledPin = 13;   // select the pin for the LED
+int val = 0;       // variable to store the value coming from the sensor
+void setup() {
+  pinMode(ledPin, OUTPUT);  // declare the ledPin as an OUTPUT
+}
+void loop() {
+  val = analogRead(potPin);    // read the value from the sensor
+  digitalWrite(ledPin, HIGH);  // turn the ledPin on
+  delay(val);                  // stop the program for some time
+  digitalWrite(ledPin, LOW);   // turn the ledPin off
+  delay(val);                  // stop the program for some time
+}
+</code>
+===== CODE =====
+==== LIBS ====
+  * https://github.com/Mohamad1994HD/28BYJ48
+==== ARDUINO STEPPER EXAMPLES ====
+<code cpp>
+/* Example sketch to control a 28BYJ-48 stepper motor with ULN2003 driver board and Arduino UNO. More info: https://www.makerguides.com */
+// Include the Arduino Stepper.h library:
+#include <Stepper.h>
+// Define number of steps per rotation:
+const int stepsPerRevolution = 2048;
+// Wiring:
+// Pin 8 to IN1 on the ULN2003 driver
+// Pin 9 to IN2 on the ULN2003 driver
+// Pin 10 to IN3 on the ULN2003 driver
+// Pin 11 to IN4 on the ULN2003 driver
+// Create stepper object called 'myStepper', note the pin order:
+Stepper myStepper = Stepper(stepsPerRevolution, 8, 10, 9, 11);
+void setup() {
+  // Set the speed to 5 rpm:
+  myStepper.setSpeed(5);
+  // Begin Serial communication at a baud rate of 9600:
+  Serial.begin(9600);
+}
+void loop() {
+  // Step one revolution in one direction:
+  Serial.println("clockwise");
+  myStepper.step(stepsPerRevolution);
+  delay(500);
+  // Step one revolution in the other direction:
+  Serial.println("counterclockwise");
+  myStepper.step(-stepsPerRevolution);
+  delay(500);
+}
+</code>
+----
+<code cpp>
+//Includes the Arduino Stepper Library
+#include <Stepper.h>
+// Defines the number of steps per rotation
+const int stepsPerRevolution = 2038;
+// Creates an instance of stepper class
+// Pins entered in sequence IN1-IN3-IN2-IN4 for proper step sequence
+Stepper myStepper = Stepper(stepsPerRevolution, 8, 10, 9, 11);
+void setup() {
+	// Nothing to do (Stepper Library sets pins as outputs)
+}
+void loop() {
+	// Rotate CW slowly
+	myStepper.setSpeed(100);
+	myStepper.step(stepsPerRevolution);
+	delay(1000);
+	// Rotate CCW quickly
+	myStepper.setSpeed(700);
+	myStepper.step(-stepsPerRevolution);
+	delay(1000);
+}
+</code>

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