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lightmeter
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implement eeprom save and load

This commit is contained in:
interfisch 2018-04-14 13:56:49 +02:00
parent 6021440717
commit 3bece79a5f
1 changed files with 256 additions and 29 deletions
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lightmeter.ino
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@ -14,28 +14,42 @@
//128 x 64 px
#define WIDTH 128
#define HEIGHT 64
#include <EEPROM.h>
#include <BH1750.h> //from: https://github.com/mysensors/MySensorsArduinoExamples/tree/master/libraries/BH1750
BH1750 lightMeter;
#define INCIDENT_CORRECTION_FACTOR 1.17
//with 1125 25 225 2465 120
//wihtout 1335 32 265 2865 145
/*1,186666667
1,28
1,177777778
1,162271805
1,208333333*/
#define PIN_LDR 0 //A0
#define PIN_BRIGHTMODE 1 //A1
#define PIN_VBAT 2 //A2
#define PIN_LED 8 //White status led A8
#define PIN_TRIGGER PB8
#define PIN_BTNLEFT PA15
#define PIN_BTNCENTER PB4
#define PIN_BTNRIGHT PB5
#define PIN_ON PB9
#define PIN_ON PB9 //pin for hardware latch
#define TIME_AUTOPOWEROFF 120000
#define TIME_METERINGMODESELECTION_CLOSE 4000
#define LDRDELAY 50 //minimum delay between ldr readings. Transistor for lower value pulldown resistor switches in between
#define TIME_METERINGMODESELECTION_CLOSE 60000
#define LDRDELAY 100 //delay between ldr switches. New analog_high or low reading after that time. Transistor for lower value pulldown resistor switches in between
#define LDRFILTERDELAY 1 //delay in ms between readings sequent readings for smoothing . LDRFILTERDELAY*64 > LDRDELAY
#define LDRSWITCHDELAY 30 //time to wait after transistor switched
#define INCIDENTDELAY 100 //minimum delay between incident sensor (BH1750) readings
#define DEBOUNCETIME 20 //time to not check for inputs after key press
#define BUTTONTIMEHOLD 750 //time for button hold
#define voltage_warn 3.4 //voltage per cell //TODO implement warning
#define VOLTAGE_WARN 3.4 //voltage per cell //TODO implement warning
//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};
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};
@ -59,9 +73,13 @@ float isoThird[]={12,16,20,25,32,40,50,64,80,100,125,160,200,250,320,400,500,640
long loopmillis=0; //only use one millis reading each loop
long last_ldrReading=0;
long last_ldrReadingFilter=0;
long last_incidentReading=0;
long millis_lastchange=0;
long millis_lastinput=0;
long millis_ledoff=0; //for led blink
long millis_opened_meteringmodeselection=0; //time when meteringmodeselecten was opened (for led flashlight timing)
#define DELAY_METERINGMODESELECTION_FLASHLIGHT 2000
long timebuttonpressed_trigger;
@ -90,7 +108,15 @@ struct Settings {
uint8_t ISOSelectionMode; //1=Full, 2=Thirds
};
bool settingsStructEqual(Settings a, Settings b){
if (a.minimumAperatureIndex!=b.minimumAperatureIndex || a.aperatureSelectionMode!=b.aperatureSelectionMode || a.shutterSelectionMode!=b.shutterSelectionMode || a.ISOSelectionMode!=b.ISOSelectionMode){
return false;
}
return true;
}
Settings userSettings= {1,1, 1,2};
Settings eeprom_userSettings; //to store current eeprom status
@ -98,9 +124,12 @@ Settings userSettings= {1,1, 1,2};
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);
uint16_t incident=0; //incident reading from bh1750
uint16_t analog_low=0; //better for low light
uint16_t analog_high=0; //better for bright light (higher pulldown resistor for ldr)
uint16_t analog_reading_filtering=0;
uint8_t analog_reading_count=0;
float ev=0; //calculated EV from LDR readings (reflected) or from Luxmeter (incident)
float ev_min=6,ev_max=12,ev_last=8;
@ -113,6 +142,16 @@ float setAperature=8; //set to use aperature. 0 for auto
float setShutter=0; //set to use shutter time, 0 for auto
uint16_t setISO=100; //set to ISO
float eeprom_setAperature=0; //set to use aperature. 0 for auto
float eeprom_setShutter=0; //set to use shutter time, 0 for auto
uint16_t eeprom_setISO=0; //set to ISO
#define EEPROMADDRESS_APERATURE 0x801F000 //float = 32bit = 4byte
#define EEPROMADDRESS_SHUTTER 0x801F004 //float = 32bit = 4byte
#define EEPROMADDRESS_ISO 0x801F008 //uint16_T 16bit = 2byte
#define EEPROMADDRESS_METERINGMODE 0x801F00A //uint8_t 1byte
#define EEPROMADDRESS_USERSETTINGS 0x801F00B //Settings struct
enum displaymode {
lightmeter,
settings,
@ -123,12 +162,20 @@ uint8_t settings_selectedItem=0; //in settings display
String settingStrings[]={"ISO:","F-Stops:","Timetable:","Turn Off"};
#define SETTINGS_SELECTEDITEM_MAX 3 //inclusive. 2 means 3 items available
boolean settings_itemActive=false; //item in settings selected to change value
#define DISPLAY_UPDATEDELAY 200
long last_displayupdate=0;
#define METERINGMODE_REFLECTIVE 0
#define METERINGMODE_INCIDENT 1
uint8_t meteringmode=METERINGMODE_REFLECTIVE;
uint8_t eeprom_meteringmode=0;
bool eeprom_red=false; //false, if eeprom need to be red
bool debug_printreadings=false;
uint16_t debug_analog_high=0;
uint16_t debug_analog_low=0;
char tempstring[16]; //for dtostrf //dtostrf(modefactor,1,3,tempstring);
@ -148,7 +195,7 @@ char tempstring[16]; //for dtostrf //dtostrf(modefactor,1,3,tempstring);
void setup() {
Serial.begin(9600);
Serial.begin(115200);
Serial.println("Started");
Serial.println("Init Display");
@ -172,33 +219,128 @@ void setup() {
digitalWrite(PIN_BRIGHTMODE, LOW);
pinMode(PIN_ON, OUTPUT);
digitalWrite(PIN_ON, HIGH);
pinMode(PIN_LED, OUTPUT);
digitalWrite(PIN_LED, HIGH);//blink led on
delay(50);
digitalWrite(PIN_LED,LOW); //blink led off
millis_lastchange=millis();
Serial.println("Initialized");
if (!digitalRead(PIN_TRIGGER)){ //hold trigger button during power on activates serial debug printing
debug_printreadings=true;
}
//display.drawPixel(10, 10, WHITE);
}
bool saveSettingsToEEPROM(bool force){
bool _eepromwritten=false;
//checks and writes changes to eeprom
if (eeprom_setAperature!=setAperature || force){ //value change or write forced
EEPROM_writeAnything(EEPROMADDRESS_APERATURE, setAperature);
_eepromwritten=true;
}
if (eeprom_setShutter!=setShutter || force){ //value change or write forced
EEPROM_writeAnything(EEPROMADDRESS_SHUTTER, setShutter);
_eepromwritten=true;
}
if (eeprom_setISO!=setISO || force){ //value change or write forced
EEPROM_writeAnything(EEPROMADDRESS_ISO, setISO);
_eepromwritten=true;
}
if (eeprom_meteringmode!=meteringmode || force){ //one of the values change or write forced
EEPROM_writeAnything(EEPROMADDRESS_METERINGMODE, meteringmode);
_eepromwritten=true;
}
if (!settingsStructEqual(eeprom_userSettings,userSettings) || force){ //one of the values change or write forced
EEPROM_writeAnything(EEPROMADDRESS_USERSETTINGS, userSettings);
_eepromwritten=true;
}
return _eepromwritten;
}
void loop() {
loopmillis=millis(); //read millis for this cycle
if (!eeprom_red){ //only executed one time
eeprom_red=true;
readEEPROM();
}
handleInputs();
calculateFromEV();
updateDisplay();
checkLED();
}
void readEEPROM(){
if (!digitalRead(PIN_BTNLEFT) && !digitalRead(PIN_BTNCENTER) && !digitalRead(PIN_BTNRIGHT) ){ //push all front buttons (left, center, right) to restore default settings
digitalWrite(PIN_LED,HIGH);
delay(1000); //1s led on confirmation
digitalWrite(PIN_LED,LOW);
saveSettingsToEEPROM(true); //force writing. userSettings contains the default values at this point
delay(200);
digitalWrite(PIN_LED,HIGH);
delay(200); //1s led on confirmation
digitalWrite(PIN_LED,LOW);
delay(200);
digitalWrite(PIN_LED,HIGH);
delay(200); //1s led on confirmation
digitalWrite(PIN_LED,LOW);
delay(1000);
}
//read current eeprom
EEPROM_readAnything(EEPROMADDRESS_APERATURE, eeprom_setAperature);
EEPROM_readAnything(EEPROMADDRESS_SHUTTER, eeprom_setShutter);
EEPROM_readAnything(EEPROMADDRESS_ISO, eeprom_setISO);
EEPROM_readAnything(EEPROMADDRESS_METERINGMODE, eeprom_meteringmode);
EEPROM_readAnything(EEPROMADDRESS_USERSETTINGS, eeprom_userSettings);
Serial.println("");
Serial.println("EEPROM eeprom settings");
Serial.println(eeprom_setAperature);
Serial.println(eeprom_setShutter);
Serial.println(eeprom_setISO);
Serial.println("EEPROM eeprom_userSettings");
Serial.println(eeprom_userSettings.minimumAperatureIndex);
Serial.println(eeprom_userSettings.aperatureSelectionMode);
Serial.println(eeprom_userSettings.shutterSelectionMode);
Serial.println(eeprom_userSettings.ISOSelectionMode);
Serial.println("");
if (eeprom_userSettings.minimumAperatureIndex==255){ //after flashing eeprom contains FF.., check one value
for (int i=0;i<10;i++){ //blink a few times to show that eeprom was clean
delay(50);
digitalWrite(PIN_LED,HIGH);
delay(50); //1s led on confirmation
digitalWrite(PIN_LED,LOW);
}
}else{ //
//apply
setAperature=eeprom_setAperature;
setShutter=eeprom_setShutter;
setISO=eeprom_setISO;
meteringmode=eeprom_meteringmode;
userSettings=eeprom_userSettings;
}
}
void handleInputs()
{
@ -290,13 +432,31 @@ void handleInputs()
vbat=map(analogRead(PIN_VBAT), 0,3560,0,8200)/1000.0; //180k and 300k voltage divider. 8,4V -> 3,15V=3910
//LDR
if ( loopmillis-last_ldrReading>LDRDELAY )
if ( loopmillis-last_ldrReadingFilter>LDRFILTERDELAY && loopmillis-last_ldrReading>LDRSWITCHDELAY) //multiple successive reading for filtering. each LDRFILTERDELAY ms and wait LDRSWITCHDELAY for first reading
{
analog_reading_filtering+=analogRead(PIN_LDR);
analog_reading_count++;
last_ldrReadingFilter=loopmillis;
}
if ( loopmillis-last_ldrReading>LDRDELAY ) //time over for one reading (low or high)
{
if (!digitalRead(PIN_BRIGHTMODE)){
analog_low=analogRead(PIN_LDR);
analog_low=analog_reading_filtering/analog_reading_count;
}else{
analog_high=analogRead(PIN_LDR);
analog_high=analog_reading_filtering/analog_reading_count;
if (debug_printreadings){
Serial.print(analog_low);//for calibration output
Serial.print(";");
Serial.println(analog_high);
}
}
/*Serial.print(analog_reading_count);
Serial.print(" value=");
Serial.println(analog_reading_filtering);*/
analog_reading_count=0; //reset
analog_reading_filtering=0; //reset
digitalWrite(PIN_BRIGHTMODE, !digitalRead(PIN_BRIGHTMODE)); //switch modes
last_ldrReading=loopmillis;
}
@ -364,7 +524,7 @@ void handleInputs()
if (millis()-millis_lastchange>TIME_AUTOPOWEROFF){
digitalWrite(PIN_ON, LOW);
poweroff();
}
if ( button_trigger || button_left || button_center || button_right ) {
@ -374,10 +534,25 @@ void handleInputs()
}
void poweroff(){
bool _eepromwritten=saveSettingsToEEPROM(false); //save only changes to eeprom
digitalWrite(PIN_LED,HIGH); //Blink led
delay(100);
digitalWrite(PIN_LED,LOW);
if (_eepromwritten){
delay(100);
digitalWrite(PIN_LED,HIGH);
delay(100);
digitalWrite(PIN_LED,LOW);
}
digitalWrite(PIN_ON, LOW); //Turn off hardware latch
}
void handleInputs_Lightmeter()
{
if ( button_center ) { //open meteringmode selection
displaymode=meteringmodeselection;
millis_opened_meteringmodeselection=loopmillis;
}
if ( button_hold_center ) { //Go to Settings
@ -440,12 +615,15 @@ void handleInputs_Lightmeter()
if (button_trigger || button_hold_trigger) { //Trigger
ev=getEV(); //set ev to current measurement by selected mode
debug_analog_high=analog_high;
debug_analog_low=analog_low;
blinkLED(20);
}
}
void handleInputs_Settings()
{
if ( button_hold_center ) { //Go to Lightmeter
@ -509,7 +687,7 @@ void handleInputs_Settings()
break;
case 3: //Turn Off
digitalWrite(PIN_ON, LOW); //set power latch low
poweroff();
break;
}
if ( button_center ){
@ -551,8 +729,12 @@ float getEV(){
float _ev=0;
if (meteringmode == METERINGMODE_REFLECTIVE){ //### SPOT
//ev=map(analog_low,500, 3500 ,500, 1400)/100.0; //for testing
//first prototype
double highev=11.7400532 + 0.000216655133*analog_high + 0.00000111372253*pow(analog_high,2) + -0.000000000163800818 *pow(analog_high,3);
double lowev=-0.763427709 + 0.0138031137*analog_low + -0.00000576990095*pow(analog_low,2) + 0.000000000871611285*pow(analog_low,3);
if (lowev>14){
_ev=highev;
@ -563,7 +745,7 @@ float getEV(){
_ev=lowev*(1-mix)+highev*mix;
}
}else if (meteringmode == METERINGMODE_INCIDENT){ //### INCIDENT
_ev = luxToEv(incident);
_ev = luxToEv(incident*INCIDENT_CORRECTION_FACTOR);
}
return _ev;
@ -834,20 +1016,24 @@ uint8_t findISOIndex(float pISO,uint8_t pMethod) //find index of closest iso fro
void updateDisplay()
{
switch(displaymode){
case lightmeter:
updateDisplay_Lightmeter();
break;
case settings:
updateDisplay_Settings();
break;
case meteringmodeselection:
updateDisplay_Meteringmodeselection();
break;
if (loopmillis-last_displayupdate>=DISPLAY_UPDATEDELAY){
switch(displaymode){
case lightmeter:
updateDisplay_Lightmeter();
break;
case settings:
updateDisplay_Settings();
break;
case meteringmodeselection:
updateDisplay_Meteringmodeselection();
break;
}
last_displayupdate=loopmillis;
display.display();
}
display.display();
}
void updateDisplay_Lightmeter() //Lightmeter display
@ -867,6 +1053,8 @@ void updateDisplay_Lightmeter() //Lightmeter display
display.clearDisplay();
display.setTextColor(WHITE);
//Aperature
float _showAperature=roundAperature(showAperature,userSettings.aperatureSelectionMode);
@ -925,6 +1113,7 @@ void updateDisplay_Lightmeter() //Lightmeter display
//ISO
display.setCursor(xpos_iso,ypos_iso); display.setTextSize(1); display.print("ISO "); display.print(setISO);
//EV Scale
uint8_t _startev=2; //first ev to display, 13 ev values can fit on screen
@ -972,7 +1161,7 @@ void updateDisplay_Lightmeter() //Lightmeter display
_displayev=(int)(ev+1);//EV Value under arrow. Ceil
}
if (_displayev>=10){
_xpos_current_evtext_move+=5; //move digits to left
_xpos_current_evtext_move+=6; //move digits to left. positive means left
}
display.setCursor(xpos_arrow-_xpos_current_evtext_move,ypos_icon_arrow+icon_arrow_height+2); //current ev text position
display.print(_displayev); //EV Value under arrow
@ -985,17 +1174,22 @@ void updateDisplay_Lightmeter() //Lightmeter display
}else if ( _ev_decimals > 0.5833 && _ev_decimals <= 0.8333) {
display.drawXBitmap(xpos_arrow , ypos_icon_arrow+icon_arrow_height-(icon_two_third_height-8)/2 +2, icon_two_third_bits, icon_two_third_width, icon_two_third_height, WHITE); //two third
}
//DEBUG Message
display.setTextSize(1);
display.setCursor(xpos_debug,ypos_debug);
display.print(vbat);
/*display.print(vbat);
display.print("V ");
display.print("Ev=");
display.print(ev);
display.print(" |");
display.print(incident);
display.print(incident);*/
display.print(debug_analog_low);
display.print(" : ");
display.print(debug_analog_high);
}
@ -1055,5 +1249,38 @@ void updateDisplay_Meteringmodeselection()
display.print("SPOT"); //7x5 characters, xpos_center_icon_spot-(5*#chars /2)
display.setCursor(xpos_center_icon_incident-20,ypos_icon_incident+icon_incident_height+6); //text position upper left
display.print("INCIDENT");
if (loopmillis-millis_opened_meteringmodeselection>=DELAY_METERINGMODESELECTION_FLASHLIGHT){
blinkLED(500); //turn led on continously
}
}
void blinkLED(long duration){
digitalWrite(PIN_LED,HIGH);
millis_ledoff=loopmillis+duration;
}
void checkLED(){
if (loopmillis>=millis_ledoff && digitalRead(PIN_LED)){
digitalWrite(PIN_LED,LOW);
}
}
template <class T> int EEPROM_writeAnything(int ee, const T& value)
{ //from http://www.stm32duino.com/viewtopic.php?t=1576
const byte* p = (const byte*)(const void*)&value;
unsigned int i;
for (i = 0; i < sizeof(value); i++)
EEPROM.write(ee++, *p++);
return i;
}
template <class T> int EEPROM_readAnything(int ee, T& value)
{
byte* p = (byte*)(void*)&value;
unsigned int i;
for (i = 0; i < sizeof(value); i++)
*p++ = EEPROM.read(ee++);
return i;
}