implement incident bh1750 sensor and lux ev calculation
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4832f6a365
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lightmeter.ino
114
lightmeter.ino
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@ -28,19 +28,24 @@ BH1750 lightMeter;
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#define PIN_ON PB9
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#define TIME_AUTOPOWEROFF 120000
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#define LDRDELAY 50 //minimum delay between ldr readings. Transistor for lower value pulldown resistor switches in between
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#define INCIDENTDELAY 100 //minimum delay between incident sensor (BH1750) readings
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#define DEBOUNCETIME 50 //time to not check for inputs after key press
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#define BUTTONTIMEHOLD 1000 //time for button hold
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#define BUTTONTIMEHOLD 750 //time for button hold
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#define voltage_warn 3.4 //voltage per cell //TODO implement warning
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//float shuttertimes1[]={1,1.0/2, 1.0/4, 1.0/8, 1.0/15, 1.0/30, 1.0/60, 1.0/125, 1.0/250, 1.0/500, 1.0/1000, 1.0/2000, 1.0/4000, 1.0/8000};
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float shuttertimes1[]={64,32,16,8,4,2,1,1.0/2, 1.0/4, 1.0/8, 1.0/15, 1.0/30, 1.0/60, 1.0/125, 1.0/250, 1.0/500, 1.0/1000, 1.0/2000, 1.0/4000, 1.0/8000};
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#define SHUTTERTIMES1_MAXINDEX 19
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String settingsnameShutterSelectionMode[]={"Analog"}; //names for tables
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#define MAXIMUM_SHUTTERSELECTIONMODES 1
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float aperaturesFull[]={1,1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32};
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#define APERATURESFULL_MAXINDEX 10
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float aperaturesHalf[]={1, 1.2, 1.4, 1.7, 2, 2.4, 2.8, 3.4, 4, 4.8, 5.6, 6.7, 8, 9.5, 11, 13, 16, 19, 22};
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#define APERATURESHALF_MAXINDEX 18
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float aperaturesThird[]={1, 1.1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.5, 2.8, 3.2, 3.5, 4, 4.5, 5.0, 5.6, 6.3, 7.1, 8, 9, 10, 11, 13, 14, 16, 18, 20, 22, 25, 29, 32, 36, 40, 45};
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#define APERATURESTHIRD_MAXINDEX 33
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String settingsnameAperatureSelectionMode[]={"Full","Half","Third"}; //names for tables
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#define MAXIMUM_APERATURESELECTIONMODES 3
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@ -51,6 +56,7 @@ float isoThird[]={12,16,20,25,32,40,50,64,80,100,125,160,200,250,320,400,500,640
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long loopmillis=0; //only use one millis reading each loop
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long last_ldrReading=0;
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long last_incidentReading=0;
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long millis_lastchange=0;
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long millis_lastinput=0;
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@ -88,6 +94,7 @@ Settings userSettings= {1,1, 1,2};
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#define OLED_RESET 4
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Adafruit_SSD1306 display(OLED_RESET);
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uint16_t incident=0; //incident reading from bh1750
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uint16_t analog_low=0; //better for low light
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uint16_t analog_high=0; //better for bright light (higher pulldown resistor for ldr)
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float ev=0; //calculated EV from LDR readings (reflected) or from Luxmeter (incident)
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@ -112,6 +119,10 @@ String settingStrings[]={"ISO:","F-Stops:","Timetable:","Turn Off"};
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#define SETTINGS_SELECTEDITEM_MAX 3 //inclusive. 2 means 3 items available
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boolean settings_itemActive=false; //item in settings selected to change value
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#define METERINGMODE_REFLECTIVE 0
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#define METERINGMODE_INCIDENT 1
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uint8_t meteringmode=METERINGMODE_REFLECTIVE;
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char tempstring[16]; //for dtostrf //dtostrf(modefactor,1,3,tempstring);
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@ -123,12 +134,13 @@ void setup() {
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Serial.begin(9600);
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Serial.println("Started");
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Serial.println("Init Display");
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display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
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display.clearDisplay();
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display.display();
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lightMeter.begin(BH1750_CONTINUOUS_HIGH_RES_MODE_2);
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Serial.println("Init BH1750");
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lightMeter.begin(BH1750_CONTINUOUS_HIGH_RES_MODE_2); //max reading=54612
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//set measurement time (for higher resolution) http://www.raspberry-pi-geek.de/Magazin/2015/04/Digital-Light-Sensor-BH1750-am-Raspberry-Pi
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//lightMeter.write8(71); //01000111 //high bit: 01000xxx bits 7,6,5
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//lightMeter.write8(126); //01111110 //log bit: 011xxxxx bits 4,3,2,1,0
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@ -159,9 +171,6 @@ void loop() {
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uint16_t lux = lightMeter.readLightLevel();
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handleInputs();
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calculateEV();
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@ -262,6 +271,7 @@ void handleInputs()
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//Voltage
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vbat=map(analogRead(PIN_VBAT), 0,3910,0,8400)/1000.0; //180k and 300k voltage divider. 8,4V -> 3,15V=3910
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//LDR
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if ( loopmillis-last_ldrReading>LDRDELAY )
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{
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if (!digitalRead(PIN_BRIGHTMODE)){
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@ -274,6 +284,16 @@ void handleInputs()
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}
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//Lightsensor BH1750
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if ( loopmillis-last_incidentReading>INCIDENTDELAY )
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{
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incident = lightMeter.readLightLevel(); //value in lux from sensor
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last_incidentReading=loopmillis;
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}
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//Test asdf
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/*
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if ( !digitalRead(PIN_TRIGGER) ) {
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@ -338,6 +358,13 @@ void handleInputs_Lightmeter()
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if ( button_hold_center ) { //Go to Settings
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displaymode=settings;
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}
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if ( button_center ) { //Change Refelctive - Incident
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if (meteringmode == METERINGMODE_REFLECTIVE){
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meteringmode = METERINGMODE_INCIDENT;
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}else if (meteringmode == METERINGMODE_INCIDENT) {
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meteringmode = METERINGMODE_REFLECTIVE;
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}
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}
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if (setShutter==0 && setAperature==0){ //Auto
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//Value Change
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@ -479,17 +506,21 @@ float reciprocFloat(float p){
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void calculateEV()
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{
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//ev=map(analog_low,500, 3500 ,500, 1400)/100.0; //for testing
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double highev=11.7400532 + 0.000216655133*analog_high + 0.00000111372253*pow(analog_high,2) + -0.000000000163800818 *pow(analog_high,3);
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double lowev=-0.763427709 + 0.0138031137*analog_low + -0.00000576990095*pow(analog_low,2) + 0.000000000871611285*pow(analog_low,3);
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if (meteringmode == METERINGMODE_REFLECTIVE){
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//ev=map(analog_low,500, 3500 ,500, 1400)/100.0; //for testing
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double highev=11.7400532 + 0.000216655133*analog_high + 0.00000111372253*pow(analog_high,2) + -0.000000000163800818 *pow(analog_high,3);
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double lowev=-0.763427709 + 0.0138031137*analog_low + -0.00000576990095*pow(analog_low,2) + 0.000000000871611285*pow(analog_low,3);
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if (lowev>14){
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ev=highev;
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}else if(lowev<12.5){
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ev=lowev;
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}else{ //mix of both
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float mix=min(1.0, max(0.0,(lowev-12.5)/(14-12.5))); //0 to 1, 0-> use only lowev, 1-> use only highev
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ev=lowev*(1-mix)+highev*mix;
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if (lowev>14){
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ev=highev;
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}else if(lowev<12.5){
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ev=lowev;
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}else{ //mix of both
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float mix=min(1.0, max(0.0,(lowev-12.5)/(14-12.5))); //0 to 1, 0-> use only lowev, 1-> use only highev
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ev=lowev*(1-mix)+highev*mix;
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}
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}else if (meteringmode == METERINGMODE_INCIDENT){
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ev = luxToEv(incident);
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}
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if (setAperature>0){ //Aperature Priority
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@ -506,6 +537,16 @@ void calculateEV()
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}
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double evToLux(double ev) {
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return pow(2, ev) * 2.5;
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}
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double luxToEv(uint16_t lux){
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if (lux <= 2){
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return 0;
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}
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return log (lux/2.5) / log (2);
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}
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float calculateShutter(float pEv, uint16_t pIso, uint16_t pAperature) //returns calculated Shutter speed given Ev, ISO and Aperature
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{
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//EV = log2 ( 100* Aperature^2 / (ISO * Time ))
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@ -590,9 +631,26 @@ uint8_t findAperatureIndex(float pAperature,uint8_t pMethod) //find index of clo
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float _minDistance=90000;
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float _lastminDistance=100000;
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uint8_t _index=userSettings.minimumAperatureIndex;
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uint8_t _maxindexpossible=0;
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switch(pMethod){
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case 1:
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_maxindexpossible=APERATURESFULL_MAXINDEX;
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break;
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case 2:
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_maxindexpossible=APERATURESHALF_MAXINDEX;
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break;
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case 3:
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_maxindexpossible=APERATURESTHIRD_MAXINDEX;
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break;
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}
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while (_lastminDistance>_minDistance) //until distance increases
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{
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if (_index>_maxindexpossible){ //this index will be out of bounds
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return _maxindexpossible;
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}
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_lastminDistance=_minDistance;
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switch(pMethod){
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@ -608,7 +666,8 @@ uint8_t findAperatureIndex(float pAperature,uint8_t pMethod) //find index of clo
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}
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_index++; //next
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}
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return _index-2;
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return _index-2; //use index with closest value
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}
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@ -641,10 +700,21 @@ uint8_t findShutterIndex(float pShutter,uint8_t pMethod) //find index of closest
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float _minDistance=abs(pShutter-shuttertimes1[0]);
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float _lastminDistance=_minDistance;
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uint8_t _index=0;
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uint8_t _maxindexpossible=0;
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switch(pMethod){
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case 1:
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_maxindexpossible=SHUTTERTIMES1_MAXINDEX;
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break;
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}
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while (_lastminDistance>=_minDistance) //until distance increases
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{
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if (_index>_maxindexpossible){ //this index will be out of bounds
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return _maxindexpossible;
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}
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_lastminDistance=_minDistance;
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switch(pMethod){
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@ -654,7 +724,8 @@ uint8_t findShutterIndex(float pShutter,uint8_t pMethod) //find index of closest
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}
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_index++; //next
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}
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return _index-2;
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return _index-2; //use index with closest value
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}
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void changeISO(int8_t pchange){ //pchange>0 means more light exposure (brighter image), higher iso
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@ -801,6 +872,13 @@ void updateDisplay_Lightmeter() //Lightmeter display
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display.print("V ");
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display.print("Ev=");
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display.print(ev);
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display.print(" |");
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display.print(incident);
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display.setTextSize(1);
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display.setCursor(10,10);
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display.print(meteringmode);
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}
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void updateDisplay_Settings()
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