Hello,
I am looking to hook two load cells (s type) up to a raspberry pi 3. I understand that i would need a combinator to do this but i was unsure if the combinator only operates if there are 4 load cells hooked up to it. So i guess my question is if i can hook 2 load cells to a combinator rather than 4 and if it would still function properly?
My next question, and i apologize because my knowledge in this area is limited, is whether i have everything i need or i guess what would be everything i need?
Currently i have a:
Raspberry pi 3
Additional things a need but havent gotten yet are:
2 tension load cells
load sensor combinator
amplifier
arduino
and some kind of display.
Do i have everything or are there some things missing? and does certain component operate best with others?
Thanks!
Hi,
The HX711 chip on the HX711 Load Cell Amplifier has two channels. The second channel is also broken-out on this board. The second load cell will have its signal wires connected to this second channel (B+ and B- inputs) and will share E+ and E- with the first load cell.
However, please note that the channel B has a fixed gain of 32 vs 128 (or 64) for channel A. It will all depend to your needs and if this gain is sufficient for your application.
As for load cells, here is our Force Sensors category for your reference. Depending on the weight you are planning to measure, we offer this 100 Kg Type S Load Cell or this 500Kg S Type Load Cell.
The HX711 board can be directly interfaced with the Raspberry Pi 3. We don’t see the need of having an Arduino board in the setup.
Here you can find an example python code to interface the Raspberry Pi with the HX711 board.
Regarding the display, you can take a look into our Raspberry Pi Accessories category. For example, you could use the 2.8" Nextion HMI LCD Touch Display
Hope this helps https://www.robotshop.com/forum/images/smilies/icon_smile.gif
