I have used two of these devices in a 3D printed motor test rig (measure thrust and torque) for my quadcopter motors. Two load cells where integrated in the support beams. The UART interface with simple ascii commands for tare and measure was a no brainer, automating data collection along with current, voltage and RPM (the latter using some other IR photodiode from Sparkfun). First order low pass filtering can be added and no noise will be seen. Accuracy was as with any kitchen digital scale, or at least I did not notice any difference when calibrated against them. I would only miss advice in the supporting material whether expanding the cabling lenght from the load cells to this device has any bearing on accuracy, since I needed to separate the propeller side from the measurement devices for safety. Regards.

Works well once you fix one bug in the firmware. It was resetting the zero value every time I power cycled the board. I had to comment out this line in the code "setting_tare_point = (long)696293;" so it did not reset the zero/tare every time the board is power cycles.

To upload new code to the board you have to use an older version of the arduino software. The most recent version would not upload software to this board but arduino version 1.6.5 worked fine.

I do industrial automation for a living and work with most of the scales/indicators. For the price, this is a great little device. Also, the integrated AVR is wonderful.

Pros

• Cant beat the cost.

• Very accurate even with no hardware filtering.

Cons

• HX711 can't do Reference adjustments (6 wire load cells) (Used if you want to trim or lengthen a Load Cell cable)

• Software is a very primitive. No FIFO Filtering, Tare, etc (Can I help?)

Screw down terminals for leads are a life saver. Novice programmers such as myself will have issues getting serial communication to work on Arduino.

One thing I did not like on my serial terminal menu was the inordinate amount of time required to hold down + or minus keys attempting to slew the cal factor? How hard would it be to allow typing it in on the text buffer and hitting enter.

Have used this module and designed five custom made weigh scales, from basic bar load sensors, to quad strain gauges in a wheat stone config, this board makes it all easier. I do recommend updating the firmware. The board works amazing and can be used by a junior hobbyist or a senior engineer and highly recommend

An excellent product. Works with a 20t load cell. really easy to use, a great start to my new project. Proof of concept was a dream.

After calibration, it reads the correct value twice, then drops 1/2 pound (5%). I've calibrated several times and it does this every-time. Seems like there a bug.

I tried the openscale. First attempt, I could get some readings from a cell I bought at the same time. I could use the menu this device offers through therminal, i could calibrate, get the zero point, but, after a couple of days of permanent use, the thing got crazy even for getting the configuration menu. I am really new working with this load cells, but maybe there is something to do with the sketch provided through git website. Temperature is a different thing, Everything is ok with temperature readings, directrly from topenscale and the same happens with remote readings form temp sensor I am going to try flashing the ATMega328P, and installing everything from scratch ... I will let you know

At first test with my raspberry pi and a certifiet loadcell, it was easypeasy, after addind 4 loadcells in bridge, thats when it started getting difficult. however after experimenting and with pure luck i discovered that increasing the average amount to 10 or more (default is 4) it started reading correct weight again. symptoms was huge drop in weight after Tare to zero, it never kept its 0. wish this gets informed about in future howto, it will sure remove lots of headace for users. all in all, i am satisfied with the openscal component, and it will be integrated in my productline

It is impressive how it works, i'm using it for an industrial scale, Im collecting data and controlling some digital i/o ( using a different card ), the best thing is i can modify the way this card is sending the data to show it in the computer.... i'm using VB.net to read the data and show it in a monitor... Great product... i take no so much time to understand the code and modify it according to my needs... Good Product....

It's a great little jump-start. Thanks to @elmer_fud for the heads-up about the over-write of the scale value at startup.
Also I found that if you want to use a gain besides x128, you need to edit the HX711 setup call to make it explicit, e.g. "HX711 scale(DAT, CLK, 32); //Setup interface to scale" (and make sure you have the write pinout for the gain you are using). There also seems to be something quirky about the averaging, but I haven't figured it out yet. If I change the averaging from 5 to 10 to 15, there are big offsets for the resulting values ... much bigger than the noise I see in the readings when using the small averaging values.

Everything worked great the first time. Connected load cells (scavenged from cheap digital weight scale) directly to board instead of using Combinator. Used Bluetooth Mate Silver for wireless control from PC and Android.

Great product! I'm using this for a scale to measure my propane level in my RV.

It would be nice if the temperature could be displayed in F without reprogramming.

Sparkfun OpenScale analog to digital processor is fantastic! It is a great value. It performs well, fast and accurate. I am using 12 on my system and did have to buy a few extras because two had some issues, but after swapping them out, they all perform very well.

Customer service is Awesome! They quickly updated my account for tax exemption and always reapply it. The best was when FedEx messed up and they immediately next day shipped my order and saved our timeline. The FedEx never showed up, so it would have really been an issue if we had to wait on FedEx situation to get resolved.

Cheers, Chipmaker

Very user-friendly, with the performance and features of high end industrial scale boards. I integrated it seamlessly with the Bluetooth Mate board.

As usual, they have good and fast delivery

Read the documentation. It's all there. Just bought a second one.

No problem, works just as expected. Very nice that it is possible to configure what it sends out.

I am new to data acquisition and stress analysis. So far, after reviewing other markets, the SparkFun board looked to be the most versatile. I am glad I made the right choice. Little did I realize that the board, for such a reasonable price, came with so many hidden benefits. At least to one whom is new to SparkFun. This is going to be an experiment that, if you wish, I shall add a comment, or two, in the future as the experiment progresses. At present, I am experimenting with various load cell types and the software involved.

It really is as simple as it sounds. I've had a few other load cell amplifiers and I mostly don't use them because setting up the coms and other aspects always seems like more work than it's worth. The OpenScale broke that barrier and I had readings from a load cell inside 30 minutes from the time I opened the package. It did exactly what I needed.

I needed to measure mechanical force inside a machine, so I could validate my force limiting improvements. I paired this with the TAS606 disc load cell and it worked great. I was worried that my data collection was going to be a huge project in itself. Once I built the mounts for the load cell, OpenScale was plug and play!

I needed an idiot friendly way of testing a 200 kg, S type load cell. It also needed to be inexpensive. This was both.

I do wish that the program for it allowed you to choose grams and ounces but it isn't too big of a limitation either. The 10hz sample speed is fine but I may need something faster for a final product (again, this was purchased to see if my idea was worth pursuing, not for using in the final product).

I was able to read out from the load cell in a kitchen scale with it (which I tore into while waiting for the big load cell to arrive). Now that I have the 200 kg cell, I found that I can measure a load as light as a can of soda and as heavy as myself. That's about all I've tested with it, and that's all I needed it to do.

Good product, it does exactly what it says it does!