Add an example script for working with the L298N shield

ino/example/example.ino

@@ -0,0 +1,59 @@
+//https://forum.arduino.cc/t/l298n-motor-shield/52627/3
+
+//L298N Motor Shield V3 flamingoeda
+
+// motor A
+int dir1PinA = 13;
+int dir2PinA = 12;
+int speedPinA = 10;
+// motor B
+// motor A
+int dir1PinB = 11;
+int dir2PinB = 8;
+
+int speedPinB = 9;
+unsigned long time;
+int speed;
+int dir;
+
+void setup() {
+	pinMode(dir1PinA, OUTPUT);
+	pinMode(dir2PinA, OUTPUT);
+	pinMode(speedPinA, OUTPUT);
+	pinMode(dir1PinB, OUTPUT);
+	pinMode(dir2PinB, OUTPUT);
+
+	pinMode(speedPinB, OUTPUT);
+	time = millis();
+	speed = 0;
+	dir = 1;
+}
+
+void loop() {
+	analogWrite(speedPinA, speed);
+	analogWrite(speedPinB, 255 - speed);
+	// set direction
+	if (1 == dir) {
+		digitalWrite(dir1PinA, LOW);
+		digitalWrite(dir2PinA, HIGH);
+		digitalWrite(dir1PinB, HIGH);
+		digitalWrite(dir2PinB, LOW);
+	} else {
+		digitalWrite(dir1PinA, HIGH);
+		digitalWrite(dir2PinA, LOW);
+		digitalWrite(dir1PinB, LOW);
+		digitalWrite(dir2PinB, HIGH);
+	}
+	if (millis() - time > 5000) {
+		time = millis();
+		speed += 20;
+		if (speed > 255) {
+			speed = 0;
+		}
+		if (1 == dir) {
+			dir = 0;
+		} else {
+			dir =1;
+		}
+	}
+}