How to use load cell and hx711 amplifier ??

Hello, i have load cell and the amplifier... i ever try so many, learn in the internet, use library code, try change the sensor, try change the arduino.. but the sensor did'nt work, would you want to help me to solve this problem???

I use load cell like the attacched file

Perhaps if you showed us which amplifier module, how you wired it, your sketch and such details there
might be a way to help. Look at the instructions for posting sticky-thread to see how to give a good
detailed posting from which we can try to understand the problem(s).

These are the load cells I have got. Haven't tried them yet but mine will be configured as a Wheatstone Bridge to weigh a Bee Hive

I use this sketch and in the image attached is the wiring

HX711.ino (1.68 KB)

OP's Fritzing.


Doesn't work like that. The HX711 needs a Wheatstone bridge.
Add a second load cell to the A+ input with red and black wires swapped, for a full bridge.
Or add a voltage divider with two equal (1k) resistors to the A+ input.
Google something like "load cell half bridge" for diagrams.
Leo..

I have try like this, but still cant work... sensor reading say "0,00 gram"

Actually i want to use 4 load cell sensor,, like this image

So, how about the wiring??

Radikia:
I have try like this, but still cant work... sensor reading say "0,00 gram"

Did you measure the resistance of the load cell before connecting them.
The colours with the highest resistance connect to E+ and E- (excitation voltage).
It is NOT always red and black.
If the half bridge is done right, there should be less than 10mV between A+ and A- without weight.

Have a look at the Sparkfun website for hookup guides and code.
Leo..

I have try that, but still cant work...

is there another way??

This is how you connect up those sensors to the HX711 in a Wheastone Bridge configuration. These diagrams I downloaded form the ebay seller so haven't confirmed whether it will work or not

HX711 Connections.JPG

Load Cell Connections.JPG

Have you tried this? no need resistors to get the output correctly?

Joining the discussion as I have just the same question. I need to order quality load cells and amplifiers (such as this provider ), and want to find some instructions here.