Arduino MEGA 2560 - SDA / SLA:

Projects General Guidance
1

Hello,

I am using an Arduino MEGA 2560 (version 1.0), operating system Windows 8, which has 1 SDA and 1 SLA pins, and I am trying to connect two temperature sensors (TMP421) which connect through the SDA and SLA pins on the Arduino.

I can get one temperature sensor working with the Arduino and it is reading the correct temperature, but I tried connecting two temperature sensors in parallel using the same SDA and SLA pins, and the output data does not reflect the actual temperature, the value is off by about 5-10 degrees C.

I am wondering what might be causing this and how we can fix this issue to have two temperature sensors running at the same time?

Thank you in advance for your help.

2

This part?

You have given each their own address?
You have pullup 4.7K pullup resistors on SCL/SDA lines?

If yes to the above, then post your code. Use the # button.