change ev calculation and calibration to log(analog reading) and add digital timetable and ev calculation bugfix
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59d59475c0
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0d2cbe50bb
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@ -2,10 +2,15 @@
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import numpy as np
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import csv
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import matplotlib.pyplot as plt
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import math
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xcolumn=0 #column with readings
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ycolumn=4 #column with calibration data
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ncoefs=3 #number of coefficients
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ncoefs=4 #number of coefficients
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#mit log
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#low (0), coeffs=4,, <2.7, ab <=2.3 benutzbar
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#high (1), coeffs=5, >2 ab >=1 knapp benutzbar, ab 2 besser
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xvalues=[]
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yvalues=[]
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@ -17,9 +22,9 @@ with open('20180413_calibration.csv', 'r') as csvfile:
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xvalue=row[xcolumn]
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yvalue=row[ycolumn]
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if len(xvalue)>0 and len(yvalue)>0 and not firstrow:
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xvalue=float(xvalue)
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xvalue=math.log(float(xvalue))
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yvalue=float(yvalue)
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if yvalue<=4:
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if yvalue<2.7:
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#print(""+str(xvalue)+" - "+str(yvalue))
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xvalues.append(xvalue)
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yvalues.append(yvalue)
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@ -28,17 +33,26 @@ with open('20180413_calibration.csv', 'r') as csvfile:
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coefs=np.polyfit(xvalues,yvalues,ncoefs) #fit polynomial curve
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print(coefs) #coef 0 is the one with highest polynomial
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xtest=np.arange(max(xvalues)) #x values for test visualization
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xtest=np.arange(max(xvalues),step=0.001) #x values for test visualization
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ytest=np.polyval(coefs, xtest) #calculate y values with polynomial function
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#ytest=[coefs[3]+coefs[2]*pow(x,1)+coefs[1]*pow(x,2)+coefs[0]*pow(x,3) for x in xtest]
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for i in range(200,4000,10):
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yv=np.polyval(coefs, i)
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print(str(i)+";"+str(yv))
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exit()
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#for i in range(200,4000,10):
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# yv=np.polyval(coefs, i)
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# print(str(i)+";"+str(yv))
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#exit()
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plt.scatter(xvalues,yvalues,s=0.25,c='g') #plot sample data
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plt.scatter(xvalues,yvalues,s=0.7,c='g') #plot sample data
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plt.plot(xtest,ytest,c='r') #plot approximated curve
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plt.xlabel('LDR Value')
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plt.ylabel('Ev')
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#plt.xlim(0,4096) #ldr
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plt.ylim(-3,20) #ev
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#limits with lux
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#plt.xlim(0,4096) #ldr
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#plt.xlim(0,500) #ldr
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#plt.ylim(0,1280000) #ev
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#plt.ylim(0,220) #ev
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plt.show()
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129
lightmeter.ino
129
lightmeter.ino
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@ -6,7 +6,7 @@
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//Letters 5x7 at Size 1
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#include <math.h>
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//#include <SPI.h>
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#include <Wire.h>
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#include <Adafruit_GFX.h>
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@ -54,8 +54,10 @@ BH1750 lightMeter;
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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 shuttertimes2[]={30,25,20,15,13,10,8,6,5,4,3.2,2.5,2,1.6,1.3,1,0.8,0.6,0.5,0.4,0.3,1.0/4,1.0/5,1.0/6,1.0/8,1.0/10,1.0/13,1.0/15,1.0/20,1.0/25,1.0/30,1.0/40,1.0/50,1.0/60,1.0/80,1.0/100,1.0/125,1.0/160,1.0/200,1.0/250,1.0/320,1.0/400,1.0/500,1.0/640,1.0/800,1.0/1000,1.0/1250,1.0/1600,1.0/2000,1.0/2500,1.0/3200,1.0/4000};
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#define SHUTTERTIMES2_MAXINDEX 51
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String settingsnameShutterSelectionMode[]={"Analog","Digital"}; //names for tables
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#define MAXIMUM_SHUTTERSELECTIONMODES 2
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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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@ -99,7 +101,7 @@ boolean button_hold_left=false;
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boolean button_hold_center=false;
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boolean button_hold_right=false;
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float vbat=0;
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float vbat=100;
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struct Settings {
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uint8_t minimumAperatureIndex; //see corresponding aperatures table
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@ -233,6 +235,8 @@ void setup() {
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}
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}
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@ -427,7 +431,10 @@ void handleInputs()
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*/
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//Voltage
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vbat=map(analogRead(PIN_VBAT), 0,3560,0,8200)/1000.0; //180k and 300k voltage divider. 8,4V -> 3,15V=3910
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float _vbat=map(analogRead(PIN_VBAT), 0,3560,0,8200)/1000.0; //180k and 300k voltage divider. 8,4V -> 3,15V=3910
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if (_vbat<vbat){
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vbat=_vbat; //voltage can only decrease
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}
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//LDR
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@ -483,28 +490,49 @@ void handleInputs()
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for (float i=1.0/8000;i<32;i*=2){
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Serial.print(i,6);
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Serial.print(" -> ");
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Serial.print(roundShutter(i,1),6);
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Serial.print(roundShutter(i,2),6);
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Serial.print(" -- ");
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Serial.println(reciprocFloat(roundShutter(i,1)));
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Serial.println(reciprocFloat(roundShutter(i,2)));
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}
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}
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Serial.println("calculateShutter at iso 100 f8");
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for (int8_t i=-2;i<18;i++){
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Serial.println("calculateShutter at iso 100 f2.8");
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for (float i=-2;i<18;i+=0.25){
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Serial.print(i);
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Serial.print(" -> ");
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Serial.println(calculateShutter(i, (uint16_t)100, 8.0),6);
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float test_calcshutter=calculateShutter(i, (uint16_t)100, 2.8);
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//Serial.println(test_calcshutter,6);
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float test_showShutter=roundShutter(test_calcshutter,2);
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Serial.print("rounded Shutter from "); Serial.print(test_calcshutter,6); Serial.print(" to "); Serial.println(test_showShutter,6); //asdf
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if (test_showShutter>0.25) //check shuttertime
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{ //show full seconds
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Serial.print("int=");
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Serial.print(int(test_showShutter));
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if (test_showShutter-int(test_showShutter)>0){ //has decimals
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Serial.print(" ,");
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Serial.print((int)round( (test_showShutter-int(test_showShutter))*10)); //show one decimal
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}
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Serial.println("");
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}else{ //show fraction of a second
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Serial.print("frac= 1/");
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int _frac_showShutter = (int) ( (1.0f/( (int)(test_showShutter*1000000) ) )*1000000 );
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Serial.print( _frac_showShutter );
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Serial.println("");
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}
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}
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Serial.println("calculateAperature at iso 100 1/125s");
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for (int8_t i=-2;i<18;i++){
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Serial.println("calculateAperature at iso 100 1/250s");
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for (float i=-2;i<18;i+=0.25){
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Serial.print(i);
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Serial.print(" -> ");
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Serial.println(calculateAperature(i, (uint16_t)100, 1.0/125),6);
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Serial.println(calculateAperature(i, (uint16_t)100, 1.0/250),6);
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}
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}
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*/
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}*/
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switch(displaymode){
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@ -625,6 +653,7 @@ void handleInputs_Lightmeter()
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void handleInputs_Settings()
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{
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if ( button_hold_center ) { //Go to Lightmeter
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settings_itemActive=false; //deselect item
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displaymode=lightmeter;
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}
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@ -733,19 +762,49 @@ float getEV(){
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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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//calibration 20180413
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double highev=4.76455098 + 0.00961533698*analog_high - 0.00000399325586*pow(analog_high,2) + 0.000000000654378697 *pow(analog_high,3);
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double lowev=-38.9534785 + 0.310426970*analog_low - 0.000769939297*pow(analog_low,2) + 0.000000639458491*pow(analog_low,3);
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//polynomial only
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//double highev=4.76455098 + 0.00961533698*analog_high - 0.00000399325586*pow(analog_high,2) + 0.000000000654378697 *pow(analog_high,3);
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//double lowev=-38.9534785 + 0.310426970*analog_low - 0.000769939297*pow(analog_low,2) + 0.000000639458491*pow(analog_low,3);
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double log_low=log(analog_low);
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//[-2.47999992e+02 5.59942657e+03 -4.74076773e+04 1.78389539e+05 -2.51728845e+05]
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double lowev=-251728.845 + 178389.539*log_low - 47407.6773*pow(log_low,2) + 5599.42657*pow(log_low,3) - 247.999992*pow(log_low,4);
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double log_high=log(analog_high);
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//[7.27310051e-02 -2.02919373e+00 2.23823220e+01 -1.22121768e+02 3.32574527e+02 -3.60445720e+02]
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double highev=-360.445720 + 332.574527*log_high - 122.121768*pow(log_high,2) + 22.3823220*pow(log_high,3) - 2.02919373*pow(log_high,4) + 0.0727310051*pow(log_high,5);
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/*Serial.print("analog_low="); //asdf
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Serial.print(analog_low);
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Serial.print(" log_low=");
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Serial.print(log_low);
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Serial.print(" lowev=");
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Serial.println(lowev);
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Serial.print("analog_high=");
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Serial.print(analog_high);
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Serial.print(" log_high=");
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Serial.print(log_high);
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Serial.print(" highev=");
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Serial.println(highev);*/
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if (lowev>6){
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if (highev>2){
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_ev=highev;
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}else if(lowev<4){
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Serial.println("using high ev");
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}else if(lowev<1){
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_ev=lowev;
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Serial.println("using low ev");
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}else{ //mix of both
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float mix=min(1.0, max(0.0,(lowev-4)/(6-4))); //0 to 1, 0-> use only lowev, 1-> use only highev
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float mix=min(1.0, max(0.0,(lowev-1)/(2-1))); //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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Serial.print("mixing mix=");
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Serial.println(mix);
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}
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Serial.print("EV=");
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Serial.println(_ev);
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}else if (meteringmode == METERINGMODE_INCIDENT){ //### INCIDENT
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_ev = luxToEv(incident*INCIDENT_CORRECTION_FACTOR);
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}
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@ -781,7 +840,7 @@ double luxToEv(uint16_t lux){
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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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float calculateShutter(float pEv, uint16_t pIso, float 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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//100* Aperature^2 / (2^EV * ISO) = Time
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@ -802,6 +861,9 @@ float roundShutter(float pShutter, uint8_t pMethod) //round shutter to typical v
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case 1: //
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return shuttertimes1[_index];
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break;
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case 2: //
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return shuttertimes2[_index];
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break;
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}
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}
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@ -915,6 +977,9 @@ void changeShutter(int8_t pchange){ //pchange>0 means more light exposure (brigh
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case 1:
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_maximumShutterIndex=sizeof(shuttertimes1)/sizeof(float);
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break;
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case 2:
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_maximumShutterIndex=sizeof(shuttertimes2)/sizeof(float);
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break;
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}
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if (!( -pchange<0 && _newShutterIndex==0)){ //changed value would not yield negative index
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@ -927,6 +992,9 @@ void changeShutter(int8_t pchange){ //pchange>0 means more light exposure (brigh
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case 1: //
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setShutter=shuttertimes1[_newShutterIndex];
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break;
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case 2: //
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setShutter=shuttertimes2[_newShutterIndex];
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break;
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}
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}
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uint8_t findShutterIndex(float pShutter,uint8_t pMethod) //find index of closest aperature from given aperature tables (pMethod
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@ -940,6 +1008,9 @@ uint8_t findShutterIndex(float pShutter,uint8_t pMethod) //find index of closest
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case 1:
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_maxindexpossible=SHUTTERTIMES1_MAXINDEX;
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break;
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case 2:
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_maxindexpossible=SHUTTERTIMES2_MAXINDEX;
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break;
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}
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@ -955,6 +1026,9 @@ uint8_t findShutterIndex(float pShutter,uint8_t pMethod) //find index of closest
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case 1:
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_minDistance=abs(pShutter - shuttertimes1[_index]);
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break;
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case 2:
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_minDistance=abs(pShutter - shuttertimes2[_index]);
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break;
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}
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_index++; //next
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}
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@ -1081,7 +1155,7 @@ void updateDisplay_Lightmeter() //Lightmeter display
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display.setCursor(xpos_shutter,ypos_shutter);
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float _showShutter=roundShutter(showShutter,userSettings.shutterSelectionMode);
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//Serial.print("rounded Shutter from "); Serial.print(showShutter); Serial.print(" to "); Serial.println(_showShutter); //asdf
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if (_showShutter>=1) //check time
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if (_showShutter>0.25) //check shuttertime
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{ //show full seconds
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display.print(int(_showShutter));
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if (_showShutter-int(_showShutter)>0){ //has decimals
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@ -1118,7 +1192,10 @@ void updateDisplay_Lightmeter() //Lightmeter display
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//EV Scale
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uint8_t _startev=2; //first ev to display, 13 ev values can fit on screen
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int8_t _startev=-5; //first ev to display, 13 ev values can fit on screen
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if (ev>2){
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_startev=2;
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}
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if (ev>13){
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_startev=5+ev-13;
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}
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@ -1134,7 +1211,7 @@ void updateDisplay_Lightmeter() //Lightmeter display
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display.drawLine(THIRDEVLINEDISTANCE,0,THIRDEVLINEDISTANCE,0,WHITE); //first third line
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display.drawLine(THIRDEVLINEDISTANCE+THIRDEVLINEDISTANCE,0,THIRDEVLINEDISTANCE+THIRDEVLINEDISTANCE,0,WHITE); //second third line
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for (uint8_t _fullevline=1;_fullevline<=13;_fullevline++){
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uint8_t _current_evvalue = _fullevline+_startev;
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int8_t _current_evvalue = _fullevline+_startev;
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uint8_t _xpos_center_evtext = _fullevline*FULLEVLINEDISTANCE; //center of current ev line x pos
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display.drawLine(_xpos_center_evtext,0,_xpos_center_evtext,2,WHITE);
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display.drawLine(_xpos_center_evtext+THIRDEVLINEDISTANCE,0,_xpos_center_evtext+THIRDEVLINEDISTANCE,0,WHITE);
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@ -1182,9 +1259,9 @@ void updateDisplay_Lightmeter() //Lightmeter display
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//DEBUG Message
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display.setTextSize(1);
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display.setCursor(xpos_debug,ypos_debug);
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/*display.print(vbat);
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display.print(vbat,2);
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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(ev);
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display.print(" |");
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display.print(incident);*/
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