Hi
I have this type hx711 card
I have read that ground is not properly connected to pin 5 on chip. Se yellow line for possible modification
Can anybody confirm this?
And is there a way to measure this with a multimeter?
M
Yes.
First remove any wires connected to the board.
Set the multimeter to resistance. Then put one probe on the chip's pin and the other on the PCB ground. If the resistance is an ohm or less then it is connected.
Thanks, i try.
Biggest question is if this is nessesary, is this ground problem real?
Yes all things connected to an Arduino input or output must have a common ground.
See
http://www.thebox.myzen.co.uk/Tutorial/Power_Supplies.html
Some (not all) HX711 boards seem to have a production error.
They don't have a double-sided board, so the bottom copper ground plane is missing.
You can see that by holding the board against a strong light (faulty ones are transparent).
Those boards don't have E- and the surrounding parts connected to ground on the other side.
Simply measure the resistance between E- and GND on opposite sides of the board.
If it's not close to zero ohm, then add a wire between those two points.
Leo..
@Wawa
Thanks, this was the answer I was looking for. How to find a faulty card, and how to fix it.
As you see on my picture, I have added ground to the chip, pin 5. This I did because I viewed a trustworthy YouTube clip. Is adding ground to pin 5 a solution, or do I have to add to E-?
Which is fine.
Both E- (bridge ground) and pin 5 (chip ground) are already joined on the board.
Connecting the ground wire to E- would also have been ok, and maybe a bit easier.
Leo..
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