Questions tagged [load-cell]
A load cell is a transducer which converts force into a measurable electrical output.
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Reading ADC using Altera DE2 Board (Beginner)
Question:
Would it be possible and feasible for a beginner to use Verilog HDL and an Altera DE2 board to read input from a weight sensor's HX711 ADC (see below), and if so:
What kind of data am I ...
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Why does this seem like a strange way of connecting a bridge circuit to the ADC?
I was planning to hook up a quarter bridge circuit to the AD7730LBR Analogue to Digital Converter that I bought. I was having a look at a "Load_Cell_Schematic" provided by this webpage (the download ...
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Using DAC to create reference in a wheatstone bridge for strain gauge?
I am designing a circuit where a microcontroller can measure the load forced upon a load cell with strain gauges, making a half bridge.
A traditional Wheatstone bridge looks like this:
Resistors ...
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Connecting a (small) load cell to Arduino using INA125P
I want to connect the load cell of my (micro) scale to my Arduino. The scale itself is able to weigh max. 800 grams with an accuracy of 0.1 grams - what I want to weigh are loads up to max. 100 grams, ...
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Whcih type of load sensor should i use to calculate weight placed in a shopping cart
I wish to calculate the load inside a shopping cart and i am confused on which type of load cell/sensor should i use. Assuming weight from (0-50 kg).
This sensor is to be interfaced with Arduino.
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Load cell and amplifier
I'm trying to get a reading from a Digi-Star load cell.
I'm using the INA122 instrumentation amplifier, the schematic is attached.
Nothing complicated, I connect the cell output directly to the ...
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How to read signal from load cell?
I took apart a weighing scale to get the load cell from it. The weight scale was capable of measuring up to 85 pounds with 5 grams precision. The voltage drop of the weight scale, however, is too ...
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Filtering Noise on Strain Gauge Circuit
I am making a digital weighing scale circuit and currently having difficulties understanding filters that are commonly used to reduce noise in these type of circuits. My load cell is a full-bridge ...
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measuring load cell output by a oscilloscope
Is it possible to read a load cell output (0~10mV with 10nV steps) by a oscilloscope? or I should buy an extra high precision Multimeter to read the load cell output?
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AD620 in-amp reference pin
I have a weighing scale project using a 200kg load cell with a rated output of 1mV/V. I used 5V as excitation voltage and an Ad620 in-amp for my amplifier. I only need atleast the 0-100kg so I only ...
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Precision voltage reference for load cell and ADC
I want to know what could I use to have a stable 5V excitation voltage for my load cell(wheatstone bridge) which I could also use to have a stable 5V reference voltage for my arduino adc. Would a ...
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Load cell for Capsule filling machine
(I am new in this era, so go easy on me :) )
I am working on a project that involves weight filling of powdered material into capsules (Fill sizes, 400 , 600 & 800 mg). . Now for the design of ...
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Earth alternative
I'm designing an industrial machine which is AC motor derived. There are sensitive analog sensors (e.g. Load cell) in the system and in the user's site, Unfortunately earth connection is not ...
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Problem connecting INA114 with LM331 for voltage to frequency conversion
i'm actually using a load cell and i would like to send the load cell information to an android tablet through jack audio.
Then load cell caracteristics are presented here: http://www.phidgets.com/...
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Arduino Leonardo + 3 wire Load Cells + INA125P – Analog Signal Bounce / Noise
I actually have a software background so my experience in electrical engineering is somewhat lacking. Never the less, I have given my first Arduino project a go and for the most part I am quite happy. ...
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Load cells for 4 legged beer fermenter [duplicate]
I'm a homebrewer. I use 5, 4 legged 200 liter tanks to ferment the beer.
I would love to be able to weigh the tanks and have the signal on my PLC to see how much I have in the tanks.
Each tank ...
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Detecting foot steps
I'm building an interactive disco dance floor. Like the light up dance floors from the 70's, but each floor panel should be able to detect when it's being stepped on and possibly light up to show this....
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Understanding load cell and instrumentation amplifier
I want to build a weight scale with 0.1 gram resolution. But I have some problems in my initial stage.
I am using a load cell with sensitivity of 1mV/V and excitation voltage of 3 V.
With no weight,...
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Load cell without In-amp
I have a 0-1kg load cell with 4 wires: Excitation + and -, and Signal + and -. I haven't had any problems wiring them up correctly without amplification, and my voltmeter shows me a 1 mV difference ...
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Hooking up a 3 wire load cell and measuring the output on an ADC
I am trying to get 4, 3 wire load cells connected together in the form of a wheatsone bridge correctly to measure weight. I have the following schematic used from this http://www.nerdkits.com/forum/...
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How to hook up a load cell to an Instrumentation amplifier correctly
I am trying to get load cells connected to an instrumentation amplifier. The load-cells I have are extremely similar to the ones here https://www.sparkfun.com/products/10245. They have 3 wires coming ...
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What should a load cell response curve look like?
I have ordered some load cells from a Chinese supplier, and I asked for a load/output calibration report.
The chart they sent me looks like this...
Correct me if I'm wrong - but this is supposed to ...
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How to make a weighing scale with independant load cells
Im working on a project for school and I need to make a scale that measures weight and also accurate pressure readings at differnt points.
Is it possible to make a scale using four independant load ...
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What is the pressure/force sensor used in the Beddit?
The Beddit sleep-tracking device (Beddit and @indiegogo) has a pressure sensor that looks like a thin (~0.3mm?), flexible tape about 2ft long. The tape seems to be constructed of several layers ...
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Load cells in series
I am working with building a digital scale (of sorts) and have a single load cell working connected to my microcontroller.
If I wish to use multiple load cells, can I simply connect their signal ...
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Problem of noise with load cell and INA125P + Arduino Uno
I am here with a problem that I cannot solve. Here are the facts:
I have a load cell : http://www.robotshop.com/en/micro-load-cell-50-kg.html
that I want to use in both directions, from -30kg to 30kg ...
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Instrumentation amplifier for load cells
In the most part of tutorials I see they use INA125 as the instrumentation amplifier for load cells.
Is it ok to use another cheaper amplifier as the AD8237? Or is there a specification or ...
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3 wire load sensor connection to INA125P
I am trying to use a 3 wire load sensor, connect it to INA125 for voltage amplification and then use the amplified output to be fed to ADC of Arduino.
I had used below configuration with INA125.
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What is the difference of a loadell input and output resistance?
I am trying to understand the specifications of a load cell and there are the input and output resistance as you can see here, it says 1090±10Ω for input resistance and 1000±10Ω of output resistance.
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Does this loadcell's creep mean that I can not let a constant load on the loadcell?
I want to build a connected scale that I can set coffee powder (for example) on it and check over the internet how much of coffee I still have without going to see it.
Usually all loadcells have a ...
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What is the strain gauge resistance variation of a 3-wire loadcell?
A 3-wire loadcell have two strain gages with a no load resistance of R.
When a load is applied, the resistance of one strain gauge will change to R+dR and the other will change to R-dR (because one ...
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Hacking a four load sensor based personal weighing scale
I am trying to hack a personal weighing scale.I had taken help of this tutorial but the language used in this is not very easy to understand due to the non-standard naming used for load sensor wires, ...
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3-wire load cells and wheatstone bridges from a bathroom scale
I am involved with a 4H project looking to take some weight measurements with bee hives and am trying to figure out some 3-wire load sensors to do just that.
I have four 3-wire sensors (load sensors/...
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How to measure weight?
Last few months I am working on personal project -- I want to measure weight of beehive during the year and then save the results. Beehives has usually from 100 to 200 kg and during one day, the ...
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Connect analog load cell to usb via AVR
I have an analog load cell with just 4 wires sticking out of it.
I want to be able to connect it to a computer via usb.
For that I am going to use the AVR micro controller and LUFA usb library.
My ...
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Combination of four half-bridge load cells
I have a kitchen weight scale containing four half-bridge load cells, each cell associated to one foot of the scale.
I want to hack it to use it as a pressure sensor and link it to an Arduino ...
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Multiple ADC readings in Arduino Uno with INA125 problems
First my system used four cheap resistive load cells (maks 5 kg, input 5 VDC) to measure COG of a quadrotor. The measurement pan dimensions are 60 cm x 60 cm and made from glass (...
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What sampling frequency do I need for a non-periodic signal?
I have a load cell attached to a crimping press (20mV Full-scale differential voltage). The press presses down on the load cell when it's crimping a terminal and the load cell outputs a differential ...
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Hooking up a load cell to a temperature logger
I have an idea for little project where I want to log weight changes (standalone) on a bee hive, preferably low-cost.
Now there's a lot of cheap temperature loggers on the market, for example this ...
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Differential ADC for Load Cell Measurement or In. Amp?
I've been tasked to design a circuit which measures the peak impact force of a crimping press on a terminal. I am using a load cell under the press as a sensor. The load cell outputs 20mV (...
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Building a weight scale [closed]
I need to build a scale that is able to get an input from a load cell, get an input from a bar-code scanner (i don't know if this is to be treated like a keyboard or if there is a more native way to ...
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ADC Value from load cell to MSP430 not correct
I have a 1000lb load cell (LC302 from omega) being fed through an INA125 OPAMP then to the ADC10 of a MSP430G2553 with 2.5V as reference.
2.5V is coming out of the OPAMP that's being fed into the ...
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Digital bathroom scale circuit - how it works?
I'd like to understand how the digital bathroom scales work. I was able to gather that there are four three-wire load cells connected into the Wheatstone bridge as suggested below. The load cells have ...
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Is the Excitation Voltage of a load cell a strict specification?
When using load cells (or strain gages generically), is the Excitation Voltage spec provided as a strict minimum -- or is it just a recommendation which one can go below as long as one is OK with a ...
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Power Electronics for 3.3v or lower MSP430 + 10v sensor
After asking around I realized that switching regulators should be used to regulate the power going to the MSP430. I'm wondering (I'm not very informed in the topic of power electronics) how can I ...
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Load Cell DAQ via Arduino Mega
Background: I'm working on a project that involves tapping into the load cells of a scale and reading the differential output of the Wheatstone bridge. I need to keep all of the original functionality ...
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Load Cell Amplifier AD620
I know AD620 is an old part but it is available at my place. I intend to develop a Load Cell amplifier. Load cell is 2mV/V. I am planing to use AD620 for it. Following are my calculations:
Excitation ...
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