#include <Wire.h>
#include <Adafruit_VEML6070.h>

// Pin assignments
#define POWER_PIN (11)  // VIN pin on VEML breakout board
#define ACK_PIN   (13)     // Note blue LED will turn *off* if ACK is set

Adafruit_VEML6070 uv = Adafruit_VEML6070();

void setup() {
  Serial.begin(115200);
  Serial.println("VEML6070 Test to Reveal Bug");
  
  pinMode(POWER_PIN, OUTPUT);
  digitalWrite(POWER_PIN, LOW);
  
  digitalWrite(ACK_PIN, INPUT_PULLUP);  // ACK is open-drain

}

bool testAck() {
  bool ack = (digitalRead(ACK_PIN) == LOW);
  if (ack) { Serial.println("ACK is set (low)"); Serial.flush(); }
}

bool i2c_ready(){
  bool ready = (digitalRead(SDA) == HIGH) && (digitalRead(SCL) == HIGH);
  if (!ready) { Serial.println("I2C bus locked"); Serial.flush(); }
  return ready;
}

void loop() {
  // Power DOWN the VEML 6070, and drive the I2C bus
  // to ground to ensure the sensor is actually power-cycled
  digitalWrite(POWER_PIN, LOW);
  pinMode(SDA, OUTPUT);
  digitalWrite(SDA, LOW);
  pinMode(SCL, OUTPUT);
  digitalWrite(SCL, LOW);
  pinMode(SDA, INPUT);
  pinMode(SCL, INPUT);
  delay(100);
  
  
  // Power up and initialize the VEML 6070
  digitalWrite(POWER_PIN, HIGH);
  Wire.begin();
  delay(1000);  // For device to power up

  i2c_ready();
  testAck();
  //if (uv.clearAck()) { Serial.println("Ack was set"); Serial.flush(); }
  i2c_ready();

  Serial.print("init.. "); Serial.flush();
  uv.begin(VEML6070_HALF_T);
  Serial.println("done");

  // Attempt to read the UV value after allowing for measurement delay
  Serial.print("UV: ");
  uint16_t value = uv.readUV();
  Serial.println(value);
}

#include <Wire.h>

#define VEML6070_ADDR_ARA       (0x18 >> 1)
#define VEML6070_ADDR_CMD       (0x70 >> 1)
#define VEML6070_ADDR_DATA_LSB  (0x71 >> 1)
#define VEML6070_ADDR_DATA_MSB  (0x73 >> 1)

// VEML6070 command register bits
#define VEML6070_CMD_WDM        0x02
#define VEML6070_CMD_SD         0x01
#define VEML6070_CMD_IT_0_5T    0x00
#define VEML6070_CMD_IT_1T      0x04
#define VEML6070_CMD_IT_2T      0x08
#define VEML6070_CMD_IT_4T      0x0C
#define VEML6070_CMD_DEFAULT (VEML6070_CMD_WDM | VEML6070_CMD_IT_1T)

byte cmd = VEML6070_CMD_DEFAULT;

void setup()
{
  
  Serial.begin(9600); 
  while(!Serial);
  Serial.println(cmd,BIN);

  Wire.begin(); 
  Wire.requestFrom(VEML6070_ADDR_ARA,1);

  Wire.beginTransmission(VEML6070_ADDR_CMD);
  Wire.write(cmd);
  Serial.println(Wire.endTransmission());

  
}

void loop()
{
  uint8_t X0,X1;
  
  Wire.requestFrom(0x39,1); 
  X0 = Wire.read(); 
  
  Wire.requestFrom(0x38,1);  
  X1 = Wire.read();   
  
  Wire.endTransmission();
  
  Serial.print("X0= ");
  Serial.print(X0);
  Serial.print("   X1= ");
  Serial.println(X1);
  
  delay(500);
}