Picking correct board for a load measuring device

Other Hardware Science and Measurement
1

Hello,

I have a load measuring device project. It will be battery operated and constantly measure the moving load and when it measured the load higher than the initial value it will save the data with time and date stamp in to an SD card. The problem is the moving load can pass quickly so I need some processor with fast clock to make sure I got all the data. I will use 3-4 load cells and because I want all their readings separately I will use 3-4 Hx711 ADCs and Ada fruit Assembled Data Logging shield for saving all the data into an SD card.

What Arduino board would you guys suggest? And Can I run it for few months with a battery? Or should I get something else like STM32?

Load cells has to measure up to 400kN load. Excitation values are 10V.

Thank you in advance

2

Which is the frequency?

3

I was thinking something with 180Hz or more. I haven't seen any Arduino board like that.

4

arduino uno
Clock Speed 16 MHz

5

Merihbbb:
I was thinking something with 180Hz or more. I haven't seen any Arduino board like that.

180 Hz?

Regards.

6

Merihbbb:
moving load can pass quickly so I need some processor with fast clock to make sure I got all the data

Three undefined values in that sentence.

The 'slow' part could be the HX711, or your coding, probably not the Arduino.

The HX711 can do 80 measurements per second (if the board is modded for 80Hz).
Default is 10 per sec.
Leo..

7

My mistake I should have typed 180 mhz.

Is there way to increase the fastness of the Hx711 with some other components? Or is there any other ACD can deliver faster?

8

My mistake I should have typed 180 mhz.

megaHz (MHz) or milliHz?

Is there way to increase the fastness of the Hx711

No.

9

Merihbbb:
Is there way to increase the fastness of the Hx711 with some other components?

Google "HX711 datasheet".

The "rate" pin (pin 15) selects between 10Hz and 80Hz.
It might need cutting a circuit board trace to disconnect the pin from ground and a wire to connect it to VCC.

Note that HX711 boards use 4.2volt excitation.
Dropping excitation from 10volt to 4.2volt, and increasing speed from 10 to 80 both drop accuracy and resolution.
Leo..