added automatic tool length detection

Author: BarbourSmith

cnc_ctrl_v1/CNC_Functions.h

@@ -36,6 +36,8 @@
 #define YSERVO 6
 #define ZSERVO 7
 
+#define SENSEPIN 53
+
 #define TOLERANCE .3//this sets how close to the target point the tool must be before it moves on.
 #define MOVETOLERANCE .2 //this sets how close the machine must be to the target line at any given moment
 
@@ -1159,6 +1161,7 @@ void G10(String readString){
 int ManualControl(String readString){
 	String readString2 = readString;
 	int stringLength = readString2.length();
+	long tmptime = millis();
 	while(1){
 		if (Serial.available()){
 			while (Serial.available()) {
@@ -1174,23 +1177,51 @@ int ManualControl(String readString){
 		if(stringLength > 0){
 			Serial.println(readString2);
 
-			if(readString2 == "Exit Manual Control"){
+			if(readString2 == "Exit Manual Control "){
 				Serial.println("Test Complete");
 				return(1);
 			}
-			if(readString2.indexOf('X') > 2){
+			if(readString2.indexOf('X') > 2 && readString2.indexOf('B') == 0){
 				x.write((readString2.substring(5)).toInt());
+				tmptime = millis();
 			}
-			if(readString2.indexOf('Y') > 2){
+			if(readString2.indexOf('Y') > 2 && readString2.indexOf('B') == 0){
 				y.write((readString2.substring(5)).toInt());
+				tmptime = millis();
 			}
-			if(readString2.indexOf('Z') > 2){
+			if(readString2.indexOf('Z') > 2 && readString2.indexOf('B') == 0){
 				z.write((readString2.substring(5)).toInt());
+				tmptime = millis();
 			}
 
 			Serial.println("gready");
 		}
+		if(millis() - tmptime > 5000){
+			Serial.println("Test Complete - Timed Out");
+			return(1);
+		}
 
 		readString2 = "";
 	}
 }
+
+float toolOffset(int pin){
+	long tmptime = millis();
+	long tmpTimeout = millis();
+	while(1){
+		tmptime = millis();
+		location.ztarget = location.ztarget - .05;
+		while(millis() - tmptime < 100){ //This is just a delay which doesn't loose the machine's position.
+			SetPos(&location); 
+			SetTarget(location.xtarget, location.ytarget, location.ztarget, &location, 123);
+
+			if(digitalRead(pin) == 0){  //The surface has been found
+				return(location.zpos);
+			}
+		}
+		if(millis() - tmpTimeout > 3000){ //if it has to move down for more than three seconds it will time out
+			Serial.println("Surface not found, position the tool closer to the sufrace and try again.");
+			return(location.zpos);
+		}
+	}
+}

cnc_ctrl_v1/cnc_ctrl_v1.ino

@@ -67,7 +67,7 @@ void setup(){
 	pinMode(xpot, INPUT);
 	pinMode(xpot, INPUT);
 	pinMode(zpot, INPUT);
-	pinMode(53, OUTPUT);
+	pinMode(SENSEPIN, INPUT_PULLUP);
 	//card.init(SPI_HALF_SPEED, chipSelect); //setup SD card
 	//volume.init(card);
 	//lcdBegin(); //Initialize the LCD
@@ -108,6 +108,7 @@ void estop(){
 void loop(){
 	readString = "";
 
+
 	if (Serial.available()){
 		while (Serial.available()) {
 			delay(1);  //delay to allow buffer to fill 
@@ -270,14 +271,22 @@ void loop(){
 	}
 
 	if(readString.substring(0, 3) == "B06"){
-		Serial.println("speed set recognized");
 		ManualControl(readString);
 		location.xtarget = location.xpos;
 		location.ytarget = location.ypos;
 		location.ztarget = location.zpos;
 		readString = "";
 		Serial.println("gready");
 	}
+	if(readString.substring(0, 3) == "B07"){
+		float ofset = toolOffset(SENSEPIN);
+		location.zpos = 0.0;
+		location.ztarget = location.zpos - ofset;
+		Move(location.xtarget, location.ytarget, location.ztarget, 127);
+		time = millis();
+		readString = "";
+		Serial.println("gready");
+	}
 
 	if(readString == "Test Encoders"){
 		testEncoders();