#include "Wire.h"
#include "LiquidCrystal_I2C.h"
#include "Adafruit_VEML7700.h"
#define TCAADDR 0x70
LiquidCrystal_I2C lcd(0x27,  20, 4);
void tcaselect(uint8_t i) {
  if (i > 7) return;
 
  Wire.beginTransmission(TCAADDR);
  Wire.write(1 << i);
  Wire.endTransmission();  
}

char cstr[5];
void printNum(unsigned long n) {
  sprintf(cstr, "%05d", n);
  lcd.print(cstr);
}

Adafruit_VEML7700 sensors[4]={
  Adafruit_VEML7700(),
  Adafruit_VEML7700(),
  Adafruit_VEML7700(),
  Adafruit_VEML7700()
};

unsigned long res;
unsigned long minLight[4];
unsigned long maxLight[4];

void setup()
{
  Wire.begin();
  Serial.begin(115200);
  lcd.init();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("---BOOT---");
  delay(100);
  lcd.backlight();
  lcd.clear();
  for (uint8_t t=0; t<4; t++) {
    tcaselect(t);
    lcd.setCursor(0,t);
    lcd.print("TCA Port #"); lcd.print(t);
    //sensors[t] = Adafruit_VEML7700();
    if (sensors[t].begin()){
      sensors[t].setGain(VEML7700_GAIN_1);
      sensors[t].setIntegrationTime(VEML7700_IT_25MS);
      lcd.print(" ok");
    }else{
      lcd.print(" !FAILED!");
    }
    minLight[t] = 99999;
    maxLight[t] = 0;
  }//end for loop
  delay(1000);
  lcd.clear();
  for (uint8_t t=0; t<4; t++) {
    lcd.setCursor(0,t); lcd.print(t+1);
    delay(100);
  }//end for loop
}

void loop() 
{
  for (uint8_t t=0; t<4; t++) {
    tcaselect(t);
    res = sensors[t].readLux();
    lcd.setCursor(2,t); printNum(res);
    if (res < minLight[t]) {minLight[t] = res; lcd.setCursor(8,t); printNum(minLight[t]);}
    if (res > maxLight[t]) {maxLight[t] = res; lcd.setCursor(14,t); printNum(maxLight[t]);}
  }//end for loop
}