Hi, I'm using a tsl2561 lux sensor with an Arduino Uno. I'm using the sensorapi script in the examples of the Adafruit tsl2561 library. However, my Arduino cannot find the sensor. So I tried a script to see if it is even detecting the I2C device, and it keeps returning, "No I2C devices found". I attached a picture of my circuit and the code.
A4 (SDA) --> to SDA pin on tsl2561 (Brown)
A5 (SCL) --> to SCL pin on tsl2561 (Gray)
GND --> GND pin on tsl2561 (Black)
5V --> Vcc pin on tsl2561 (Red)
(It looks like in the picture that the red wire is connected to 3.3 V but it is connected to 5)
#include <Wire.h>
void setup()
{
Wire.begin();
Serial.begin(9600);
while (!Serial); // Wait for Serial to be ready
Serial.println("\nI2C Scanner");
}
void loop()
{
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for (address = 1; address < 127; address++ )
{
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address < 16)
Serial.print("0");
Serial.print(address, HEX);
Serial.println(" !");
nDevices++;
}
else if (error == 4)
{
Serial.print("Unknown error at address 0x");
if (address < 16)
Serial.print("0");
Serial.println(address, HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found\n");
else
Serial.println("done\n");
delay(5000); // Wait 5 seconds for next scan
}