Circuit for reading weight and displaying into LED

Thread Starter

xksnx

Joined Nov 15, 2023
4
Hello,
I want to fabricate a PCB capable of reading weight from between 0 - 100 lb, and then take that data through some microchip PIC and display it to a LCD or LED.
I'm not very familiar with load scales, but I was curious if there were any ideas or insights into the proper components needed. (So far everyone recommends to use the HX711 into a PIC16)
I would honestly want to buy a daughterboard that can just go straight into my PIC.
Thanks
 

ericgibbs

Joined Jan 29, 2010
18,652
Hi xks.
The HX711 PCB is a plug in model.
You can also connect your Load Cell to the module using a connector.
There are many examples online of the PIC programming required to read and display the weights

E
 

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wayneh

Joined Sep 9, 2010
17,493
Hello,
I want to fabricate a PCB capable of reading weight from between 0 - 100 lb, and then take that data through some microchip PIC and display it to a LCD or LED.
I'm not very familiar with load scales, but I was curious if there were any ideas or insights into the proper components needed. (So far everyone recommends to use the HX711 into a PIC16)
I would honestly want to buy a daughterboard that can just go straight into my PIC.
Thanks
You'll need to wrestle with how much precision, accuracy and range you want. You've stated your range, but not the other two. Reading integral pounds, 0-100, should be fairly cheap. Every significant figure of precision you add will add cost. For instance 0.000 to 100.000 would be expensive and require leveling, control of airflow and ambient vibrations. Ensuring accuracy is even more expensive because calibration is the only way to obtain it. You can do it yourself or buy more expensive equipment.
 

liaifat85

Joined Sep 12, 2023
48
I would honestly want to buy a daughterboard that can just go straight into my PIC.
Thanks
I'm afraid that you won't find such a ready-made plug and play system. You have to interface a HX711 module with your PIC microcontroller and connect the load cell to the HX711.
 

Thread Starter

xksnx

Joined Nov 15, 2023
4
okay awesome, thank you all for the replies.

Im just looking for something that can read up to 0.1 , and then take that value and display as a color. For example, if it is between 0.0 and 25.0 display red on an LED. If between 25.1 and 75.0 display yellow, and if between 75.1 and 100, display red.

Do you know if any load cells are I2C, or can any work and all i need to care about is the HX711
 

ericgibbs

Joined Jan 29, 2010
18,652
Hi xk,
The HX711 is not I2C, you can drive it from a micro.
Which load cells do you have?
E
Which type of micro do you plan to use?
 
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Thread Starter

xksnx

Joined Nov 15, 2023
4
Hi xk,
The HX711 is not I2C, you can drive it from a micro.
Which load cells do you have?
E
Which type of micro do you plan to use?
So theoretically, I want to make a cabinet, with a small scale in each drawer connected to a central power supply.


I wanted to design a circuit board with a PIC16F877A connected to a HX711 to a simple 50kg single point loadcell.


Is this as easy as it sounds to me?


Sorry for the long delay in replies, you are very helpful.
 

ericgibbs

Joined Jan 29, 2010
18,652
hi xk,
If it is possible, I would suggest you consider an Arduino micro.
There are many examples and libraries available for the HX711, using an Arduino.
As you may know, the Arduino IDE is a free download.

Will there be a 50kG L/Cell in each drawer and how many drawers?
I assume that each L/C unit will have its own LCD display?

E
 

Thread Starter

xksnx

Joined Nov 15, 2023
4
hi xk,
If it is possible, I would suggest you consider an Arduino micro.
There are many examples and libraries available for the HX711, using an Arduino.
As you may know, the Arduino IDE is a free download.

Will there be a 50kG L/Cell in each drawer and how many drawers?
I assume that each L/C unit will have its own LCD display?

E
This project needs to be a microchip PIC unfortunately.
We wanted to do 4 PICs each with their own embedded system in the drawer. all connected to a centralized power supply.

Very similar to the MCP3564 ADC.
https://www.electronicsforu.com/ele...nce-design-for-a-high-accuracy-weighing-scale

We may add a temperature sensor as well.
 
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