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Questions tagged [load-cell]

A load cell is a transducer which converts force into a measurable electrical output.

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21 views

Analog Sensor output signal accuracy and sensitivity

I have to decide between 2 load cell models. the only difference between the two is that the output on one is 2mV/V and the other is 3mV/V. Both are rated at 2.5klbs. Which one of them would be more ...
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1answer
26 views

Load cell series connection

I want to measure weight of 200kg using load cell. i have to use 4 load cell ( each capacity is 50kg). My question is : is this possible to increase the capacity of load cell from 50kg to 200kg by ...
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1answer
63 views

Instrumentation Amplifier - is it possible to have an output signal inverted, with respect to the supply voltage?

I'm doing some circuit design in order to translate a load cell input into the pedal input of a Logitech G27. What I want to achieve involves having a balanced state output as close to 5V from the ...
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0answers
33 views

hx711 values non-linear

I have an hx711 ADC module with 4 50kg load sensors wired in a wheatstone bridge (for a maximum load of 200kg). When I apply load to the sensors, the resulting values for increasing weights appear to ...
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1answer
31 views

Extending load cell wires

I've Googled but didn't find an answer. Is it problematic to extend load cell wires? I would like to have the 4 cells under the 4 corners of something (since the object rests on those 4 corners), but ...
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57 views

I used a compression load cell, a HX711 and a Raspberry and I get really terrible inconsistent readings, are these devices incompitable?

I wanted to create a 10-200 lbs scale using a FX1901-200 lbs load cell (https://www.digikey.ch/product-detail/en/te-connectivity-measurement-specialties/FX1901-0001-0200-L/223-1531-ND/5277314), a ...
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1answer
87 views

How is a load cell made? [closed]

Someone know how a common cheap 4-wire load cell is made? I'm referring at one that it is in the cheap Chinese scale, like this. In particular, using a multimeter, I would try to identify the ...
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1answer
84 views

Problem encountered while amplifying load cell signal with LM358

I have an S-type load cell to measure weight up to 100 Kg. Its datasheet mentions 3mV/V against full range and excitation voltage. When no weight is applied, the voltage is 9.9 mV (Excitation is 10 V)...
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38 views

Load cell reading change with time

I am tested my load cell scale with a 19.10kg weight of LP Gas cylinder, I found that the weight had crept up to 19.20kg overnight. Is this common? The strain gauges are cheap ex bathroom scale. How ...
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0answers
31 views

Wheatstone gauge factor calculation?WII load cell

Currently working with the WIIFIT or WIbalance load cell. For some reason everybody wants to work with these load cell. However, there are no actual datasheet of the load cell used in the device. ...
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2answers
123 views

Cheap load cell and ADS1232 strange oscillation

I'm using four of these load cells wired in parallel and connected to an ADS1232. Overall the device (scale) is working well, but I am seeing a strange signal over a period of a few minutes after I ...
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0answers
46 views

Remove Contactor Noise from Load Cell Reading

I have connected my ADS1231 with STM32F030R8T6 as shown in the attached image. I have given 3.3 V power to both micro controller and adc. I am connecting load cells and i am getting satisfactory ...
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1answer
114 views

Creep on a load cell

I am working with a 50kg load cell. In the datasheet(https://www.sparkfun.com/datasheets/Sensors/loadsensor.pdf), the creep is defined by (3min)%FS. What does it mean?
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1answer
120 views

Making 2 layer board, using ground pour when I already use ground plane?

I'm working on a project were we are making PCB for measuring weight with 24-bit ADC (AD7792), MCU and GSM module. Because those measurements are highly sensitive, we are considering AGND and DGND ...
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1answer
63 views

Load cell amplifier inverse voltage output

I'm making a load cell modification to my Logitech G29 brake pedal. The potentiometer on the existing pedal have inverse voltage so 5V is no brake applied and 0V is max brake applied. This is inverse ...
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2answers
104 views

What's the difference between consumer and industrial grade strain gauge adhesive? [closed]

Can I just use normal super glue and epoxy resin to attach a strain gauge?? What am I sacrificing by doing so? Also, how are load cells so cheap and what kind of adhesive / covering do they use?
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1answer
79 views

How to rationalize load cell readings

I am working on a project for development of load cell amplifier circuit. I want to rationalize the output of the load cell to fix counts like 20000 counts at full range capacity. I have 5 Kg load ...
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0answers
105 views

Noise in Load cell

How to reduce noise of Load cell? Do i need to ground or where do i ground the transducer? We tried isolating the load cell physically and electrically. We tested it far from the motor but when the ...
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1answer
121 views

Can I use any GPIO pins on the Raspberry Pi for the HX711 Amplifier?

We're going to use an HX711 amplifier to read data from a strain gauge - the SparkFun page says you can use any GPIO pins but it one is "clock" and one is "data." What does that mean in this case? ...
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1answer
346 views

4 full bridge load-cells with the HX711

I'm trying to hook up the load cells from a Wii fit balance board to an esp8266 using the HX711 ADC. Ideally, a way using only one HX711 but, a hookup guide for two HX711 with two load cells apiece ...
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0answers
241 views

How to connect bathroom scale (arduino+hx711+spark load connector)

Im a new user in the electronic world. I tried to hack my bathroom weight scale but no success. There is a great tutorial which I followed: https://www.youtube.com/watch?v=iywsJB-T-mU my parts: ...
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0answers
183 views

Connecting a 1kg Load Cell to Arduino Via HX711

I am trying to measure from a 1kg load using an Arduino via an HX711 ADC amplifier. However I am reading a constant value on the Arduino. Here is the resistance values I measure across the load cell ...
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1answer
66 views

KL43Z Load Cell with INA 125P

I'm trying to use a Load cell with the INA 125P amplifier with my FRDM KL-43Z board. Currently, I have it connected like so with the Arduino being replaced with the KL43Z analog input (...
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0answers
55 views

Setup for a single 3 wire strain gauge

All, I am trying to set up a single 50kg 3 wire strain gauge (from Amazon) to a HX711 (also from Amazonenter link description here). I'd like to only use one of these gauges as I do not require the ...
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1answer
64 views

Total Weight for load cell when connected in a wheat stone pattern?

I have 4 load cells from AnyLoad, Model 563YH-SE5Klb. Each Load cell is 5Klb and i want to connect them in a wheat stone bridge format. My surface area for the load is 3 feet by 5 feet, and thats why ...
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0answers
54 views

Simulate a loadcell with the Beaglebone green

With a voltage divider, I want to read the excitation voltage of a load cell connector (4 wires) and simulate the load on the load cell. For what I found, I can use a PWM signal with a simple filter ...
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1answer
76 views

How to measure weight at end of arm

I have a setup where I need to measure the weight at the end of an arm. The arm is clamped between two pieces of aluminum at one end. The Sensor S is mounted a short distance (5cm?) from the aluminum ...
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0answers
275 views

Selecting Capacitor for High Frequency Noise Smoothing

I have been using a HX711 ADC for measuring a Load Cell. I get a jittery output from the HX711. Measuring the Excitation Voltage output from the HX711 on an Oscilloscope shows that it has a 250KHz ...
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3answers
63 views

Measuring ripple voltage using on-board components. Is it possible?

I am designing a circuit with a very sensitive analog part. In order to eliminate SMPS noise from a regular power supply, the device has its own non-SMPS power supply followed by an ultra low noise ...
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1answer
421 views

HX711 always read same value

I'm trying to use a www.sparkfun.com/products/13879 with one 3 wires load cell I gathered from an old scale, so I reproduced this schematic. However the reading is always the same. I use the code from ...
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1answer
945 views

Load cell temperature compensation

Can someone explain to me how this (as advertised) full bridge load cell works? I'm aiming for good temperature stability and I understood a full bridge load cell configuration should reject error ...
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1answer
144 views

TrackPoint a.k.a pointing stick 2-axis force sensor

I have an application that would benefit from a sensitive two-axis force or bending torque measurement very much like what a pointing stick (a.k.a. TrackPoint) used to do in a ThinkPad, apparently ...
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1answer
42 views

usual unloaded load cell diagonal voltage?

I found a load cell and wonder if its working or damaged since the diagonal voltage is not zero with no load on it. The diagonal voltage is about two volts when I supply 5 volts. There are no stickers ...
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1answer
624 views

Connect load cell to hx711

I have a 50 kg load cell and an HX711 sensor (as in the image below), my problem is that in all the tutorials I've seen people use load cells with 4 output wires or 2 cells with 3 output cables, I ...
4
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1answer
340 views

Difficulties reverse engineering a digital bathroom scale

I apologize if this has been discussed elsewhere and for the length of the post. This is a group project and we plan to take the weight value from the scale and send it via a WiFi connection to ...
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0answers
73 views

Why do we need voltage stabilizion in bridge measuring system with ratiometric connection?

i found in many weight scale reference designs that they use either low noise linear regulator or voltage reference for voltage stabilization. Why do we use them if ratiometric design cancel the ...
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1answer
983 views

How to interface the HX711 Weight Scale ADC with a microcontroller? [closed]

In my project I need to interface HX711 24 bit External ADC to STM32L100RC6 MCU How can I do this ?
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2answers
61 views

Measuring Load cells [closed]

On a 3-wire load cell that has a black , red, and white wire......... I would think if I ohmed out the resistance between the red and white or red and black or any combination there of, that I would ...
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0answers
887 views

How to build a load cell in ISIS Proteus?

I want to simulate an electronic scale in ISIS Proteus . For this I chose to use a load cell and connect it to an ATMEGA32 micro controller But there is not any model to simulate a load cell in ...
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0answers
232 views

Load cell circuit does not work on circuit simulator

I want to simulate a load cell interfacing with AD620 for amplification. - My load cell is 40 Kg max with 2mV/V sensitivity and 10 V excitation voltage with input resistance of 405 ohm and output ...
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1answer
327 views

Using 8 half bridge load cells together

In my arduino project, I want to combine 8 half bridge load cells (each has 3 wires, RED, BLACK & WHITE) because i will be weighing irregularly shaped objects and 4 points of contacts may not be ...
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1answer
498 views

Why isn't my load cell detected by openscale?

I want to measure the pull force on a rope, so I bought myself a Sparkfun OpenScale and this tensile load cell. I just received both of them, so I connected them as described and hooked the OpenScale ...
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2answers
578 views

Can I read out this 10V load cell with the 5V OpenScale board?

For a robotics project in which I want to build a kite flying robot I want to measure the pull force on the rope connected to the kite. To measure this pull force I bought this load cell (which ...
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1answer
804 views

INA125P Strain gauge amplification problem

I'm using the INA125P to amplify the strain of a 350 ohm strain gauge in a self-built Wheatstone bridge circuit for measurement. I'm testing using a 351 ohm resistor to mimick a strain gauge under ...
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0answers
205 views

Amplifying load cell output to be read by arduino

I have an LC201-100:http://www.omega.com/pressure/pdf/LC201.pdf and an arduino that i would like to read the voltage with. Here are the specs: Excitation: 10V (I know i can use 5V from arduino though ...
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1answer
83 views

Negative differential to instrumentation amplifier causing problems

I am using a pair of strain gauges to make a weight scale. The strain gauges are the three-wire type that you can by on Amazon or Sparkfun. The strain gauges form a full wheatstone bridge, whose ...
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2answers
137 views

Hook up a load cell with High Level Amplied Output (only input+ input- output+) to load cell amplifer

I have been successfully hooking up load cells (e.g., TAS606, red = E+, green = O+, black = E-, and white = O-) and load sensors (with help from a load cell contaminator ) to load cell amplifer (e.g., ...
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1answer
2k views

Has anyone worked with HX711 load cell amplifier / weighting sensor through Arduino? [closed]

I am talking about this product: http://www.ebay.in/itm/232127458591?aff_source=Sok-Goog I need to know the following: 1) What outputs are represented by DT and SCK? 2) What inputs are B- and B+? ...
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1answer
105 views

Load Cell has abnormal wire coloring

pulled a load cell from a small scale that I bought from amazon. I read online about how to use a INA125P to amplify the signal from the load cell, but when i examined the load cell i pulled from the ...
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1answer
834 views

Readings from Load Cell Combinator and HX711 connected to an Arduino Uno

I'm trying to get a reading from a set of four 3-wire load cells connected with a Sparkfun Load Cell Combinator (link removed) to a Sparkfun HX711 amplifier. I've followed the Sparkfun hookup guide (...