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dwblair / load-cell

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load cell measurement circuitry links #1

Open dwblair opened 10 years ago

dwblair commented 10 years ago

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=37&t=43026

http://www.ebay.com/itm/3000-LB-S-TYPE-LOAD-CELL-HANGING-CRANE-SCALE-ALLOY-STEEL-TENSION-COMPRESSION-LBS-/251335329253?pt=LH_DefaultDomain_0&hash=item3a84c0c5e5

http://www.ebay.com/itm/S-TYPE-Beam-Load-Cell-Scale-Sensor-Weighting-Sensor-1000kg-22CWT-With-Cable-/281265642259?pt=LH_DefaultDomain_0&hash=item417cbd1b13

http://www.ebay.com/itm/3000-LB-S-TYPE-LOAD-CELL-HANGING-CRANE-SCALE-ALLOY-STEEL-TENSION-COMPRESSION-LBS-/251335329253?pt=LH_DefaultDomain_0&hash=item3a84c0c5e5

dwblair commented 10 years ago

http://forums.adafruit.com/viewtopic.php?f=31&t=12269

dwblair commented 10 years ago

http://www.abelectronics.co.uk/adcpiarduino/info.aspx

dwblair commented 10 years ago

http://www.abelectronics.co.uk/products/3/Raspberry-Pi/17/ADC-Pi-V2---Raspberry-Pi-Analogue-to-Digital-converter

dwblair commented 10 years ago

http://www.abelectronics.co.uk/products/3/Raspberry-Pi/39/ADC-DAC-Pi-Raspberry-Pi-ADC-and-DAC-expansion-board

dwblair commented 10 years ago

http://www.abelectronics.co.uk/products/3/Raspberry-Pi/14/Delta-Sigma-Pi-18-bit-Analogue-to-Digital-converter

dwblair commented 10 years ago

http://forum.arduino.cc/index.php?topic=121730.0;wap2

dwblair commented 10 years ago

http://www.rqna.net/qna/nvuysx-how-to-connect-load-cell-to-arduino.pdf http://www.rqna.net/qna/nvuysx-how-to-connect-load-cell-to-arduino.html

dwblair commented 10 years ago

http://forums.adafruit.com/viewtopic.php?f=31&t=12269

dwblair commented 10 years ago

http://asliceofraspberrypi.blogspot.com/2013/11/developing-raspberry-pi-wobbulator.html

dwblair commented 10 years ago

http://baye.com/high-intensity-training-heresy/

https://docs.google.com/spreadsheet/ccc?key=0Aj92oPqI2WPMdEthcF9Rbk8zRGs0NDB2MmF6eE5HSXc#gid=0

dwblair commented 10 years ago

applications:

can choose different load cell sizes, and order them

sell it as a 'raspberry pi weighing kit'

home timed static contraction kit

dwblair commented 10 years ago

http://hackaday.com/2013/06/12/building-a-digital-scale-from-scratch/

dwblair commented 10 years ago

http://baye.com/tag/timed-static-contraction/

dwblair commented 10 years ago

http://www.ebay.com/itm/3000-LB-S-TYPE-LOAD-CELL-HANGING-CRANE-SCALE-ALLOY-STEEL-TENSION-COMPRESSION-LBS-/251335329253?pt=LH_DefaultDomain_0&hash=item3a84c0c5e5

dwblair commented 10 years ago

http://www.phidgets.com/products.php?category=34 and http://www.robotshop.com/en/500kg-s-type-load-cell.html

contact them re: 1000 kg load cells or more!

dwblair commented 10 years ago

1000 kg load cell for $70: http://www.ebay.com/itm/like/281265642259?lpid=82

dwblair commented 10 years ago

http://www.800loadcel.com/load_cells/stype_load_cells.html

dwblair commented 10 years ago

http://www.ti.com/lit/ml/slyp163/slyp163.pdf -- ti app note re: load cells

dwblair commented 10 years ago

proper chip to use: MCP3424

on digikey: http://www.digikey.com/product-detail/en/MCP3424-E%2FST/MCP3424-E%2FST-ND/1680891

datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22088c.pdf

dwblair commented 10 years ago

JeeLabs has a library for the analog plug using the mcp3424 http://jeelabs.org/2012/04/13/analog-plug-readout/

dwblair commented 10 years ago

Looks like the MCP3422 version is better, as it has just the number of channels necessary: http://www.phanderson.com/picaxe/mcp3421.html

dwblair commented 10 years ago

MCP3422: http://www.digikey.com/product-detail/en/MCP3422A0-E%2FSN/MCP3422A0-E%2FSN-ND/1680881

dwblair commented 10 years ago

Grab one of these prototyping boards for the MCP3422 package: http://www.ebay.com/itm/20-PCS-SOP8-SO8-SOIC8-SMD-to-DIP8-Adapter-PCB-Board-Convertor-Double-Sides-244A-/171038348049?pt=LH_DefaultDomain_0&hash=item27d2ae1311

dwblair commented 10 years ago

Better chip: ADS1232.

Datasheet: http://www.ti.com/lit/ds/symlink/ads1232.pdf

See Fig 32 for an application

Guide for using: http://www.ti.com/lit/wp/sbaa154/sbaa154.pdf

http://forum.arduino.cc/index.php/topic,131086.0.html

ADS1232 on mouser: http://www.mouser.com/Search/Refine.aspx?Keyword=ADS1232

Or: ADS1231? there's a nice guide to using this in the above link ...

And the ads1231 on mouser for $6: http://www.mouser.com/ProductDetail/Texas-Instruments/ADS1231ID/?qs=sGAEpiMZZMvTvDTV69d2Qm6Kx6l03TNCPj1f16%252bnqhc%3d

-- see figure 24 on the datasheet for ads1231 for the weight scale application: http://www.ti.com/lit/ds/symlink/ads1231.pdf

http://www.ti.com/lit/ug/sbau175a/sbau175a.pdf

dwblair commented 10 years ago

load cell troubleshooting: http://www.vishaypg.com/docs/11867/vpg-08.pdf

load cell primer: http://www.phidgets.com/docs/Load_Cell_Primer

dwblair commented 10 years ago

http://gozips.uakron.edu/~dorfi/StrainGageWheatStoneBridgeCalibration.pdf

dwblair commented 10 years ago

Great doc on how a wheatstone bridge works, and how to choose resistors to minimize error. I think it's indicating we need resistors that are as close to the anticipated resistance range as possible.

dwblair commented 10 years ago

Again: great info on the ads12131: note downloadable code from aerowin

vstamos commented 9 years ago

'raspberry pi weighing kit' do you have any more info on this?