Arduino Hx711 Weight Scale Interface 1 0 Software
If you prefer kilograms, change the Serial.print(“ lbs”); line to kg. The calibration factor will be significantly different but it will be linearly related to lbs (1 lbs = 0.453592 kg). Arduino UNO Board x 1. 16×2 Alphanumeric LCD x 1. Load Cell x 1. HX711 Module x 1. 10K variable Resistor x 1. 4.7K Resistor x 1. 100 Resistor x 1. Push-to-on Switch x 1. Circuit Description of Arduino weighing Machine. The arduino based layout of the project is shown in figure 1. As stated earlier, the Arduino UNO Board is the heart of the circuit. The HX711 break out board interfacing with the load cell and Arduino Uno or Mega. In this article, we are doing the calibration of the load cell or weight measurement. The load cell calibration and weight measurement will be covered in future articles.
This Instructable describes how to make a weighing scale using readily available off the shelf parts.Materials needed:. Arduino - (this design uses a standard Arduino Uno, other Arduino versions or clones should work also). HX711 on breakout board - This microchip is specially made for amplifying the signals from load cells and reporting them to another mircocontroller. The load cells plug into this board, and this board tells the Arduino what the load cells measure. 50kg load cells (x4) - Load cells are specially shaped metal parts that have strain gauges glue to them. The strain gauges are resistors that change their resitance when they are bent. When the metal part bends, the resistance of the load cell changes (the HX711 measures this small change in resistance accurately).
You can buy the load cells and HX711 as a kit here: If you do purchase the kit please leave a review! It is really helpful for future buyers. Sturdy flat mounting surface - a stiff piece of hardwood or metal is ideal. Wires in various colors for connecting all the parts. Power supply for Arduino. Hello, I am working on a beehive scale using these sensors and setup. I had the same problem and the reason was that the HX711 library updated during March in a way that is not compatible with old projects anymore.
Arduino Hx711 Weight Scale Interface 1 0 Software Download
Remove all versions of HX711 library that you installed, delete them from the local folder and install the previous version of the library. The scripts of this article was written based on the previous version.
Check here, For me everything works. The calibration script is what i needed.
Posted 2016/01/14. Last updated 2016/01/22. IntroductionOne of the nice things about going back home is that I can spend quality time with my dad, working on electronics projects. This time, the project was fixing a digital bathroom scale. Its voltage regulator was burnt, but bypassing it did not work, and the passive components did not seem obviously damaged, so the problem probably originated from the ICs with scratched off markings, or the epoxy blog.The obvious solution (well, besides buying a new one, but what kind of a solution is that?) was to get rid of the internal components, reuse the case and the sensors, and build everything from scratch. There are some good tutorials out there for this, but they tend to either focus on reverse-engineering the LCD signals (e.g.
And ) or focus on other parts of the circuit such as the output of the ADC converter (e.g. And ) to get access to the readings, but neither would work in this case, as the scale was non-functional. And those tutorials that actually use the sensors directly tend to be proof-of-concepts (e.g. And ) instead of complete, usable solutions.As a result, I wanted the end-result to fit in the original casing, and perform the same way as a regular scale, with features such as auto power-off. This write-up explains how the task was accomplished using an, the Analog-to-Digital Converter (ADC), and a 4-Digit 7-Segment Display driven by the chip, with the code on per usual. UPDATE: This project has been featured on and!. Measuring the WeightThe on digital scales are usually of the type, such that their resistance changes based on the pressure/force applied to the device.
Usually, this takes the form of a wire (foil) arranged in a zig-zag pattern, such that the variability in the resistance is more sensitive to strain in one of the two directions (vertical/horizontal).The of the strain gauge quantifies how the resistance changes based on the strain applied. However, the typical changes in resistance are in the order of less than 1 Ohm, so they cannot be measured directly as is. The solution lies in placing the gauges in a configuration, as shown below (image from Wikipedia). The Display ModuleThough I had verified that the original display of the scale still works, I decided against using it, as the LCD had 20 pins, and reverse-engineering it without seeing it in action would be too much of a hassle (though a good project on its own for the future). I instead ended up using a common-cathode, 4-digit, 7-segment display (see for the pinout), which I drove with the MAX7219 chip by Maxim, exactly as described in the, but also placing a 10μF electrolytic and a 100nF ceramic capacitor between its VCC and GND.
It is worth mentioning that the and the, and chips are also pin-for-pin compatible with the MAX7219, though I did not test them here. For driving the chip, I used the library, though with minor modifications for displaying various characters of the alphabet (links to my and ), and created a dependent library that took care of displaying and/or flashing the desired values and messages. Here is what my modular display looks like. The idea is to have a PNP transistor (I used the ) connected to the battery, which is turned on by connecting its base to ground through a regular tactile button switch. This powers the Arduino (through the regulator), which then sends current to the base of an NPN transistor (the in this case), essentially connecting the base of the PNP transistor to ground. This allows the circuit to stay on, even when the button switch is no longer pressed, until the Arduino turns the pin off in code, when the readings have been stable for a few seconds.In the end, the display was kept on one PCB (and connected via a pin header and a Molex connector on one end), while the rest of the components were soldered on a separate perfboard by my dad who did a great job placing them in a way that would make everything routing easy. The two PCBs were then separated by cardboard to prevent any short-circuits.
The end result can be seen below on the left, with the zeroed scale on the right (which also shows the display surrounded by cardboard to hide all other components). Future ImprovementsThough the scale is fully functional, the truth is that more pins would be welcome to implement more functionality. And even though using an directly is easy, the form factor of the Arduino is probably more convenient, since it consists only of SMD components, can be programmed using its mini-USB interface, and clones are available for about $2.Regarding the current functionality, it is worth mentioning that the reset pin is connected to a button that turns the scale off, but by burning the fuses appropriately or by using a voltage divider (see for an explanation of both options), the pin can be used to reset the tare weight. This was implemented in code, along with the ability to calibrate the scale against fixed weights via long and short presses, and storing the scaling factor in the EEPROM, but the interface was not particularly intuitive and overall I doubt it would be useful, so I ended up removing it.With more I/O pins, however, the functionality could be improved, for instance with up/down buttons, and the scale could also use the kg/lb switch present in the original.
Finally, we would also be able to use the extra pins to implement, which allows estimating the body fat percentage, and for which the sensors are already present on the scale. 3ds max 64 bit free download with crack. ConclusionOverall, although the code is pretty simple, but I like the fact that the hardware brought everything together, and that the scale behaves exactly like a regular scale, with auto power-off functionality, and also looks like a real scale as it fits in the original space. And though there is plenty of room for additional functionality, it was very educational to see how digital scales actually work, and create what is essentially a full product.
And as always, if you want to try it out for yourself, the code, library, and schematics are available on the.