Piece off homing code into its own script.

app/data/cfg.json

@@ -1,5 +1,5 @@
 {
-  "version": "1.8.50",
+  "version": "1.8.51",
   "ext_port": 1111,
   "profiles": {
     "mcopy": {

app/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "mcopy-app",
-  "version": "1.8.50",
+  "version": "1.8.51",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {

app/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mcopy-app",
-  "version": "1.8.50",
+  "version": "1.8.51",
   "description": "GUI for the mcopy small gauge film optical printer platform",
   "main": "main.js",
   "scripts": {

data/cfg.json

@@ -1,5 +1,5 @@
 {
-  "version": "1.8.50",
+  "version": "1.8.51",
   "ext_port": 1111,
   "profiles": {
     "mcopy": {

notes/mcopy_projector_homing_debug.csv

@@ -0,0 +1,200 @@
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notes/mcopy_projector_homing_debug/mcopy_projector_homing_debug.ino

@@ -0,0 +1,206 @@
+#include <AccelStepper.h>
+
+#define TAKEUP_DIR_PIN 3
+#define TAKEUP_STEP_PIN 2
+
+#define FEED_DIR_PIN 7
+#define FEED_STEP_PIN 6
+
+#define TAKEUP_SETTINGS_A 4
+#define TAKEUP_SETTINGS_B 5
+
+#define FEED_SETTINGS_A 8
+#define FEED_SETTINGS_B 9
+
+#define TAKEUP_EMITTER 17
+#define TAKEUP_RECEIVER A8
+#define FEED_EMITTER 18
+#define FEED_RECEIVER A9
+
+AccelStepper _takeup(AccelStepper::DRIVER, TAKEUP_STEP_PIN, TAKEUP_DIR_PIN);
+AccelStepper _feed(AccelStepper::DRIVER, FEED_STEP_PIN, FEED_DIR_PIN);
+
+uint32_t _motorSteps = 200;
+uint8_t _mode = 1;
+
+long _feedSamples[200]; 
+long _takeupSamples[200];
+
+const float _speed = 2000.0;
+
+void setup () {
+	Serial.begin(57600);
+
+	_takeup.setMaxSpeed(_speed);
+	_takeup.setSpeed(_speed);
+	_takeup.setAcceleration(1000.0);
+
+	_feed.setMaxSpeed(_speed);
+	_feed.setSpeed(_speed);
+	_feed.setAcceleration(1000.0);
+
+    pinMode(TAKEUP_SETTINGS_A, OUTPUT);
+	pinMode(TAKEUP_SETTINGS_B, OUTPUT);
+	pinMode(FEED_SETTINGS_A, OUTPUT);
+	pinMode(FEED_SETTINGS_B, OUTPUT);
+	
+	pinMode(TAKEUP_RECEIVER, INPUT);
+	pinMode(FEED_RECEIVER, INPUT);
+
+	digitalWrite(TAKEUP_SETTINGS_A, LOW);
+	digitalWrite(TAKEUP_SETTINGS_B, LOW);
+	digitalWrite(FEED_SETTINGS_A, LOW);
+	digitalWrite(FEED_SETTINGS_B, LOW);
+
+	delay(2000);
+	home();
+}
+
+void loop () {
+
+}
+
+long readVcc() {
+	long result;
+	// Read 1.1V reference against AVcc
+	ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
+	delay(2); // Wait for Vref to settle
+	ADCSRA |= _BV(ADSC); // Convert
+	while (bit_is_set(ADCSRA,ADSC));
+	result = ADCL;
+	result |= ADCH<<8;
+	result = 1125300L / result; // Back-calculate AVcc in mV
+	return result;
+}
+
+long analogReadAccurate (uint8_t pin) {
+	double Vcc = readVcc() / 1000.0;
+	double ADCValue = analogRead(pin);
+	return (ADCValue / 1024.0) * Vcc;
+}
+
+long analogReadAccurateAverage (uint8_t pin) {
+	uint8_t count = 3;
+	double sum = 0.0;
+	for (uint8_t i = 0; i < count; i++) {
+		sum += analogReadAccurate(pin);
+		delay(1);
+	}
+	return sum / (double) count;
+}
+
+uint16_t findPeak(long (&arr)[200], uint16_t &steps) {
+	uint16_t maxI = 0;
+	long max = 0;
+	for (uint16_t i = 0; i < steps; i++) {
+		if (arr[i] > max) {
+			maxI = i;
+			max = arr[i];
+		}
+	}
+	return maxI;
+}
+
+void home () {
+	uint16_t steps = _motorSteps * _mode;
+	uint16_t quarter = steps / 4;
+	uint16_t eighth = quarter / 2;
+	uint16_t takeupPeak = 0;
+	uint16_t feedPeak = 0;
+	uint16_t takeupOffset = 0;
+	uint16_t feedOffset = 0;
+	long takeupReading = 0.0;
+	long feedReading = 0.0;
+
+	Serial.println("home()");
+
+	delay(10);
+
+	for (uint16_t i = 0; i < steps; i++) {
+		takeupReading = analogReadAccurateAverage(TAKEUP_RECEIVER);
+		feedReading = analogReadAccurateAverage(FEED_RECEIVER);
+		_takeupSamples[i] = takeupReading;
+		_feedSamples[i] = feedReading;
+		if (i < steps - 1) {
+			_takeup.move(1);
+			_feed.move(1);
+			_takeup.runToPosition();
+			_feed.runToPosition();
+		}
+	}
+
+	for (uint16_t i = 0; i < steps; i++) {
+		Serial.print(i);
+		Serial.print(", ");
+		Serial.print(_takeupSamples[i]);
+		Serial.print(", ");
+		Serial.println(_feedSamples[i]);
+	}
+
+	takeupPeak = findPeak(_takeupSamples, steps);
+	feedPeak = findPeak(_feedSamples, steps);
+	Serial.print("  takeup peak: ");
+	Serial.println(takeupPeak);
+	Serial.print("    feed peak: ");
+	Serial.println(feedPeak);
+
+	takeupOffset = abs(steps - takeupPeak);
+	feedOffset = abs(steps - feedPeak);
+
+	Serial.print("takeup offset: ");
+	Serial.println(takeupOffset);
+	Serial.print("  feed offset: ");
+	Serial.println(feedOffset);
+
+	if (takeupOffset > 0) {
+		for (uint16_t i = 0; i < takeupOffset; i++) {
+			_takeup.move(-1);
+			_takeup.runToPosition();
+		}
+	}
+	if (feedOffset > 0) {
+		for (uint16_t i = 0; i < feedOffset; i++) {
+			_feed.move(-1);
+			_feed.runToPosition();
+		}
+	}
+	/*
+	for (uint16_t i = 0; i < eighth; i++) {
+		_takeup.move(-1);
+		_feed.move(-1);
+		_takeup.runToPosition();
+		_feed.runToPosition();
+	}
+
+	for (uint16_t i = 0; i < quarter; i++) {
+		takeupReading = analogReadAccurateAverage(TAKEUP_RECEIVER);
+		feedReading = analogReadAccurateAverage(FEED_RECEIVER);
+		_takeupSamples[i] = takeupReading;
+		_feedSamples[i] = feedReading;
+		if (i < steps - 1) {
+			_takeup.move(1);
+			_feed.move(1);
+			_takeup.runToPosition();
+			_feed.runToPosition();
+		}
+	}
+	
+	takeupPeak = findPeak(_takeupSamples, quarter);
+	feedPeak = findPeak(_feedSamples, quarter);
+	takeupOffset = abs(quarter - takeupPeak);
+	feedOffset = abs(quarter - feedPeak);
+	
+	if (takeupOffset > 0) {
+		for (uint16_t i = 0; i < takeupOffset; i++) {
+			_takeup.move(-1);
+			_takeup.runToPosition();
+		}
+	}
+	if (feedOffset > 0) {
+		for (uint16_t i = 0; i < feedOffset; i++) {
+			_feed.move(-1);
+			_feed.runToPosition();
+		}
+	}
+	*/
+}

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "mcopy",
-  "version": "1.8.50",
+  "version": "1.8.51",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "mcopy",
-      "version": "1.8.50",
+      "version": "1.8.51",
       "license": "MIT",
       "dependencies": {
         "arduino": "file:app/lib/arduino",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mcopy",
-  "version": "1.8.50",
+  "version": "1.8.51",
   "description": "Small gauge film optical printer platform",
   "main": "build.js",
   "directories": {

processing/mcopy/cfg.json

@@ -1,5 +1,5 @@
 {
-  "version": "1.8.50",
+  "version": "1.8.51",
   "ext_port": 1111,
   "profiles": {
     "mcopy": {