HX711 Digital Load Cell Module, Weight Sensor A/D Module with Display 24 Bit Weighing Scale Smart Arduino Load Cell Arduino Display/for Arduino

Works great once you figure it out

Nice little unit, very versatile with the following options:Power:- Micro USB- .1" Header- Barrel PlugData:- Display- TTL serialWhat it doesn't have:- Unit conversions (or any units at all)- Data over USB - this won't work as a USB-based scale.It works with any resistor bridge load cell, with or without the HX711 instrumentation amp.(This covers just about all load cells out there)There isn't a weight limit with this, the weight limit is dependent on the load cell you are using.The data will also display accurately in the negative direction as well (i.e. pulling on a compression load cell)Whether this will damage the load cell depends on the load cell you have, but this unit will still work.I've attached a better description of the buttons since theirs are not very clear.Tap function is listed, then the press and hold function in parenthesis.To set this up:1. Connect load cell then power to the board2. Press and hold "(Settings)" to access parameters3. Set parameters as desired.Press "Up"/"Down" to change parameter value,Press "Enter" to save valuePress "Left" to go to the next parameter.4. Press and Hold "(Settings)" to access parameters5. Remove force from load cell, then press and hold "(Calibrate 0)"6. Set the value to 0 or your "neutral" value7. Press "Enter" to save value8. Add a calibrated force to the load cell, then press and hold "(Calibrate Weight)"9. Set the value to the weight or force in whatever unit you are working in.10. Press "Enter" to save value11. Remove the weight/force, then Press and hold "(Tare)" to reset to 0 (or your "neutral" value)Note: Fully recalibrate if you swap load cells with a different capacity and/or mV/V rate, but you should only need to tare if you swap with an identical load cell.

ZERO instructions. Not one piece of paper. 14 connection points with zero idea of functionality. voltage requirement not specified. Not even a clue about a data sheet.

The instructions supplied by customer D. Maciuca are very helpful - thank you! I also downloaded and used those supplied by the manufacturer. I still had a learning process to go through before successfully getting it to work for me. In my experience, contrary to what it appeared to me was suggested by the two sources of instruction I just mentioned, one could not simply enter the value of the weight used to set the "high" calibration point. I needed to enter the value (which I found by multiple set and check repetitions) that would result in the correct weight being displayed. This is logical, as the amplifier/display module will work with load cells that have different output scaling (2 millivolt/volt or 1.2 millivolt/volt, for example). You set the "low" calibration point with no force applied (enter "0"), then apply a force reasonably within the normal measurement range of the load cell used (I used a 100 kg load cell with 1.2 mV/V output to measure tension and used a 20 kg weight for calibration) and adjust the high point value until the module shows the value you want displayed for that amount of weight. I have it display in pounds and so set a value that would result in the display showing "44" when I had 44 lbs (20 kg) hanging from the load cell. I did not enter "44" - I did at first, but that resulted in something around "12" being displayed, so I then entered higher "high" calibration point values until the display did show "44". The relationship between differing amounts of force applied and the output of the load cell is essentially perfectly linear, so the amplifier/display module will then correctly measure any other weight within the normal operating range of the cell, including those greater than the one you used for the "high" calibration point. One other thing that I learned the hard way is that you cannot screw female eye bolts to the threaded studs on a miniature/canister (as opposed to s-type) load cell so far that they contact the cell itself at all without causing the measurement to be extremely erratic. I ended up using a low profile nut on each side of the load cell, screwing them toward the cell down the studs as far as I could without touching the cell itself and then tightening the eye bolts against the nuts. I had at first made the mistake of screwing the eyebolts down until they contacted the load cell, not realizing that they would create an unstable compression force on the cell and play havoc with any attempt at calibration.

The module performed as advertised, but I had to request full documentation from the seller to get details on the setup procedures and options. However, they were very responsive - I had my download link within 24 hours. If the data had been readily available for download, I would have given 5 stars. Can definitely recommend this part and the seller.

Scrolls through the menus but when I enter into a calibration menu (low or high) and attempt to save/write my settings, it hangs with a "0" and locks up. Too bad I got a junk version. Not sure I'll try again with this one, I may look for other versions that aren't so hit and miss, if they exist.

This unit hooked up to my load cell and 5V, and it gives me an output, but I cannot understand from the instructions how to use it with an Arduino or even how to calibrate it.It does pick up small changes, though -- it captures the squeeze from my hand on a 2000 kg load cell, and that's sensitive!I wish I knew how to USE it, either as a direct-reading device or with my Arduino. The included directions are written in English, but they are impossible to understand.

I'm using this to create a wireless set of scales based on an existing set of reb-co automotive scales with 635kg load cells, these HX711 modules, and raspberry Pi modules. I can hook up the device to the load cell, set zero, access all of the set up functions, but it just doesn't deliver an output when I put weight on the scale. The instructions provided by others helps, but other than spending hours fiddling with it I don't know what to do next, as there's no option to contact the seller