added Bourns Motorized Pot PRM examples

Author: tigoe

BournsMotorizedPotPRM/MotorPotTarget/MotorPotTarget.ino

@@ -0,0 +1,51 @@
+/*
+    Motorized potentiometer controller
+    Moves a motorized potentiometer in the direction
+    of a target value.
+
+    This was designed to work with a Bourns PRM series potentiometer
+    e.g. PRM162-K420K-103B1
+
+    created 17 Jan 2017
+    by Tom Igoe
+*/
+int target = 512;       // target pot value
+int noise = 5;          // electrical noise value for pot
+void setup() {
+  Serial.begin(9600);   // open serial communications
+  pinMode(4, OUTPUT);   // H-bridge is on pins 4 and 5
+  pinMode(5, OUTPUT);
+}
+
+void loop() {
+  int sensor = analogRead(A0);        // read pot
+  int difference =  target - sensor;  // determine difference
+  Serial.print(sensor);               // print sensor
+  Serial.print("\t");                 // print tab
+  Serial.println(difference);         // print difference
+
+  // if difference is < noise in either direction:
+  if (abs(difference) < noise) {
+    difference = 0;       // difference is irrelevant
+  } 
+  moveMotor(difference);  // move motor
+}
+
+// direction of amount sets direction of motor
+// if direction = 0, motor turns off.
+// magnitude of direction is not used.
+void moveMotor(int amount) {
+  if (amount < 0) {
+    digitalWrite(4, HIGH);
+    digitalWrite(5, LOW);
+  } else {
+    digitalWrite(4, LOW);
+    digitalWrite(5, HIGH);
+  }
+  if (amount == 0) {
+    digitalWrite(4, LOW);
+    digitalWrite(5, LOW);
+  }
+  
+}
+

BournsMotorizedPotPRM/motorPotWipe/motorPotWipe.ino

@@ -0,0 +1,50 @@
+/*
+   Motorized potentiometer controller
+   Moves a motorized potentiometer back and forth
+   across its range.
+
+    This was designed to work with a Bourns PRM series potentiometer
+    e.g. PRM162-K420K-103B1
+
+   created 17 Jan 2017
+   by Tom Igoe
+*/
+
+int direction = 1;
+
+void setup() {
+  Serial.begin(9600);   // open serial communications
+  pinMode(4, OUTPUT);   // H-bridge is on pins 4 and 5
+  pinMode(5, OUTPUT);
+}
+
+void loop() {
+  int sensor = analogRead(A0);  // read sensor
+  Serial.println(sensor);       // print it
+
+  if (sensor >= 1020) {         // if sensor is near top of range
+    direction = -1;             // direction is downward
+  }
+  if (sensor <= 10) {           // if sensor is near bottom of range
+    direction = 1;              // direction is upwards
+  }
+  moveMotor(direction);         // move motor
+}
+
+// direction of amount sets direction of motor
+// if direction = 0, motor turns off.
+// magnitude of direction is not used.
+void moveMotor(int amount) {
+  if (amount < 0) {
+    digitalWrite(4, HIGH);
+    digitalWrite(5, LOW);
+  } else {
+    digitalWrite(4, LOW);
+    digitalWrite(5, HIGH);
+  }
+  if (amount == 0) {
+    digitalWrite(4, LOW);
+    digitalWrite(5, LOW);
+  }
+}
+