Temperature and light on one I2C bus, on an Arduino Uno

// A TMP117 and a VEML7700 on one I2C bus.
//
// Two sensors, two addresses, one pair of wires: the TMP117 (0x48) reads
// temperature to a hundredth of a degree, the VEML7700 (0x10) reads light in
// lux. I2C lets any number of parts share SDA and SCL as long as each answers
// at its own address.
//
//   TMP117    SDA, SCL -> SDA, SCL (A4, A5)   VIN -> 5V, GND -> GND
//   VEML7700  SDA, SCL -> SDA, SCL (A4, A5)   VIN -> 5V, GND -> GND
//
// Every second the sketch prints both readings on the serial monitor. Move
// the temperature and lux sliders while it runs.
//
// THINGS TO TRY. Wire the TMP117's ADD0 to VIN: it moves to 0x49, begin()
// finds nothing at 0x48, and the sketch says so.

#include <Wire.h>
#include <Adafruit_TMP117.h>
#include <Adafruit_VEML7700.h>

Adafruit_TMP117 tmp117;
Adafruit_VEML7700 veml;

void setup() {
  Serial.begin(9600);
  if (!tmp117.begin()) {
    Serial.println("No TMP117 at 0x48: check SDA, SCL and ADD0.");
    while (1) {}
  }
  if (!veml.begin()) {
    Serial.println("No VEML7700 at 0x10: check SDA and SCL.");
    while (1) {}
  }
  Serial.println("TMP117 at 0x48 and VEML7700 at 0x10 on one bus");
}

void loop() {
  sensors_event_t temp;
  tmp117.getEvent(&temp);
  float lux = veml.readLux();
  Serial.print("temperature ");
  Serial.print(temp.temperature, 2);
  Serial.print(" C, light ");
  Serial.print(lux, 1);
  Serial.println(" lux");
  delay(1000);
}