Connecting a Load Cell to Qwicc sparkfun amplifier to Arduino Uno

Other Hardware Sensors
1

Hello Everyone,
Please forgive me if I'm neglecting to post important information, this is the first time I'm using the Arduino forums, and I'm generally a beginner.
I need to make a project where a load cell is needed to be used. I got a Qwiic Scale Amplifier and 20kg load cell. The load cell connects easily to the amplifier, but I'm having trouble connecting the amplifier to my Arduino Uno.
The hookup guide only gives information with I2C or the QUICC cable, which isn't available to me. The hookup guide says I can use the connector pins, but I can't find any information on how to connect those, or even more importantly libraries to give me example code.

I'm so confused and I need help to figure out how to make it work, or at least a pointer in the right direction.

Thanks in Advance.

2

I2C is not available to you? Why not?

Both are provided by the link you posted.

3

Qwiic has VCC, SCL, SDA, GND in a convenient connector.
You can just use the pinholes on the side of the board instead.
Leo..

4

That link gives all wiring info and link to library examples.

5

Hey, thanks for the help! I've read through the sparkfun page, and the library examples again. Unfortunately they all seem to point to the use of the QWICC connector. Even the library examples, none of them have information about what pins to use or anything like that. I even tried to do "ctrl + f" and look up sda and scl in all the library examples.
I can't really buy a sparkfun arduino and a Qwicc cable or the qwicc sheild to fix the issue easily, so I really am confused on what to do.
I misspoke with I2C not being available. I meant that I can't use the QWICC cable, as I can't buy it easily. I guess I2C is availible, but I can't figure out how to use it.

6

Hey, thanks for the reply!!
I've figured that bit out, I just cant figure out how to connect those to the arduino, the example code on the hookup guide assume the use of the sparkfun Qwicc connector. And I just can't figure out how to convert it the soldered pinholes, codewise and with the connections to the arduino

7

Which Uno. There are currently three different ones.
That board seems to be designed for the Uno R4, which has a Qwicc connector.

If you have an Uno R3, then connect sensor 3.3volt to Uno 3.3volt.
Ground to ground, and SDA/SCL to A4/A5 respectively.
Leo..

Powering the board from 5volt seems possible, which could give you a higher resolution if you adjust sensor Aref in the sketch. At 5volt you can't use the Quicc connector to other sensors though.

8

That would pass the Uno R3's 5V I2C signals to a device powered with 3V3. I would connect the Uno R3's 5V to the 3V3 of the scale.

9

Oh my god, thank you so much!! I finally figured it out. I didn't even know that you should connect to a4/a5.

10

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.