Project using two I2C Devices

Using Arduino Networking, Protocols, and Devices
1

Hello,

I am making a project that uses 2 I2C Devices and an Arduino UNO R3.

  1. TEA5767 FM Radio Module
  2. LCD Display (with I2C Backpack)

I am creating this project as a circuit board but I am gonna try it on a breadboard first. Before I build the complete project I need to the answer to the following question.

Do I need two 10k resistors placed between the SCL and SDA pins (A4 and A5) as pull up/down resistors?

I have created the diagram below as what I understand but feel free to correct me if it is wrong.

Many Thanks,

Brett

Circuit.jpg
Circuit.jpg814×522 63.6 KB

2

Do I need two 10k resistors placed between the SCL and SDA pins (A4 and A5) as pull up/down resistors?

No, you need 4k7 resistors but you need them only once for the bus, so you don't need them for every device connected. Check if the board you're trying to connect not already contain pull-ups.

I have created the diagram below as what I understand but feel free to correct me if it is wrong.

If you're using an UNO R3 don't use A4/A5 but us the pins labeled SDA/SCL. Although they are internally connected it's more future proof to use the dedicated pins (p.e. they work on an Arduino Leonardo too).