Hello,
I'm building a project that has to measure weight from 3 load cells.
Load cells are 1 to 5mt distant from the main board.
My actual hardware has HX711 next to the Arduino, and load cells connected with ethernet cable at a 5 mt distance.
I MUST use just one cable. So I'm using a shielded ethernet cable, and I'm using half bridge load cells (I know that's not the best), so they have ground in common + 2 wires for each cell (E+ and A+), so it's E+, A+ (2) * 3 cells = 6 wires + 2 wires ground.
I would like to move HX711 next to the weighting object. So using CLK twisted with a GND, and DTA1, DTA2, DTA3 twisted with VCC.
I'm not sure if 5mt is too much for HX711. What do you think? Have you tried it?
Thanks!
auto-reply: tested at 5mt distance it works.
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Probably best to have the HX711 nearer the load cells as it is the instrument taking the measurement, from there it's just a matter of carrying the digital signal to the arduino.
From my experience Excitation voltage and Signal bus can be further away then digital low current/low voltage DC signal like the MCU to HX711 signal. So I think it will be better to have HX711 nearest to the cell, if possible. Unluckily for this project I can not do this, cause I want to use 1pcs standard RJ45 4 twisted pairs cables to read up to 3 cells.
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