Light Meter Using I2C Level Converter, LCD, and TSL2561using arduino




I recently needed to measure how different materials affect light transmission for a gardening project.  I decided this was the perfect opportunity to try out the new logic level converter to run both a 5v LCD and a 3.3v light sensor on a single i2c bus.  I used the following parts in this project:

Light Meter Using I2C Level Converter, LCD, and TSL2561




Optional (but definitely helps keep everything tidy):

First up is wiring power to the breadboard from the Arduino.  I decided to keep the left side for 3.3v and the right side for 5v.

  • Breadboard right ground bus – black wire – Arduino ground pin
  • Breadboard right positive bus (5v bus) – red wire – Arduino 5v pin
  • Breadboard left ground bus – black wire – Breadboard right ground bus
  • Breadboard left positive bus (3.3v bus) – yellow wire – Arduino 3.3v pin

The next step is adding the logic level converter to the breadboard. It straddles the center notch like a DIP (but takes one additional column). I placed it toward the top of the breadboard to leave plenty of space for the light sensor to be added later.

Light Meter Using I2C Level Converter, LCD, and TSL2561

  • Level converter LV pin – yellow wire – Breadboard 3.3v bus
  • Level converter HV pin – red wire – Breadboard 5v bus
  • Level converter left GND pin – black wire – Breadboard left ground bus
  • Level converter right GND pin – black wire – Breadboard right ground bus
  • Level converter B1 pin – green wire – Arduino analog pin 5 (i2c clock line)
  • Level converter B2 pin – blue wire – Arduino analog pin 4 (i2c data line)

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  • light meter using ldr and lcd i2c arduino

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