[HX-711 Load cell] Cannot get float from (scale.get_units(), 1)

Other Hardware Sensors
1

I'm recently got a weight cell and am following this tutorial:

Instead of using Uno, I'm using Leornardo board on AVR ISP

I'm also using the library suggested from the tutorial:

Everything works fine until I tried to log the scale data into a float value by

//What i want but doesn't work//
float scaleunit = (scale.get_units(), 1);
serial.print (scaleunit);

The codes only work on these circumferences:

//Works//
serial.print (scale.get_units(), 1);

&

//Works//
float scaleunit = (scale.get_units());
serial.print (scaleunit);

I wonder why would specifically (scale.get_units(), 1) doesn't work and if i still want the function from the 1 (to print the average of 5 readings from the ADC minus tare weight, divided by the SCALE parameter set with set_scale), what should I write?

Thanks so much,
Cher

2

I wonder why would specifically (scale.get_units(), 1) doesn't work

What do you expect it to do? For me it's clear that it doesn't work but I don't know your expectations.

In the case of the print() call the "1" after the comma is a separate parameter to the print method but without calling any method I don't see why you specify a "1" after a comma.

3

I wonder why would specifically (scale.get_units(), 1) doesn't work

Look up the "C/C++ comma operator".