Comments for Airtripper's 3D Printer and Arduino Blog http://airtripper.com 3D Printer usage and modifications plus Arduino powered electronic projects and 3D Printing designs. Wed, 23 Apr 2014 11:25:12 +0000 hourly 1 http://wordpress.org/?v=3.8.3 Comment on Arduino Load Cell Circuit & Sketch for Calibration Test by Mark Heywoodhttp://airtripper.com/1626/arduino-load-cell-circuit-sketch-for-calibration-test/#comment-656 Wed, 23 Apr 2014 11:25:12 +0000 http://airtripper.com/?p=1626#comment-656 Hello,

I’ve not tried using the 3 wire load cells yet but I believe you have the half bridge type.

To use the circuit in this article, you will need to convert your load cell to a full bridge. The links below point to discussions about converting a 3 wire half bridge load cell to a 4 wire full bridge load cell.

The software for the Arduino outputs grammes but the code can easily edited to output Kg instead, I can help with that when you are ready.

http://www.electro-tech-online.com/threads/3-wire-load-cell-question.32536/
https://forum.allaboutcircuits.com/showthread.php?t=84383

Mark

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Comment on Arduino Load Cell Circuit & Sketch for Calibration Test by Ammarhttp://airtripper.com/1626/arduino-load-cell-circuit-sketch-for-calibration-test/#comment-651 Sun, 20 Apr 2014 06:48:13 +0000 http://airtripper.com/?p=1626#comment-651 Hi,

sir, I really don’t know much about,
I use the combination of 3 wires load cell (Red, White and Black wire) which give out 4 pin labelled as S+ S- E+ E-

I want these 4 pin into INA125P , as Vout from INA125P connect to arduino Uno to convert the value to kilograms as I want to calculate the people weight..

Kindly need your help sir…

Ammar

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Comment on Arduino Load Cell Circuit & Sketch for Calibration Test by Mark Heywoodhttp://airtripper.com/1626/arduino-load-cell-circuit-sketch-for-calibration-test/#comment-648 Fri, 18 Apr 2014 16:25:36 +0000 http://airtripper.com/?p=1626#comment-648 Hello,

You could use any load cell I guess, the issue you will have is the final measuring resolution after calibration. 180KG load cell might have a resolution of around 200grams through an 10bit analogue microcontroller input such as on the Arduino UNO. The Teensy 3.1 microcontroller will provide better resolution; High Resolution Analog Inputs (13 bits usable, 16 bit hardware).

If you need better resolution than what can be provided by the microcontrollers, try the 24bit HX711 Dual-Channel Weighing Sensor Module. The reads will be much slower, but fast enough if you are just weighing stuff.

Mark

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Comment on Arduino Load Cell Circuit & Sketch for Calibration Test by Ammarhttp://airtripper.com/1626/arduino-load-cell-circuit-sketch-for-calibration-test/#comment-647 Fri, 18 Apr 2014 15:51:13 +0000 http://airtripper.com/?p=1626#comment-647 Hi,
you use 5kg load cell right…
can i apply 180kg load cell ?

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Comment on Resistance Wire Heated Build Platform DIY Tutorial by Beginning Work on Custom 3d Printer – Heated Print Bed | Hobbies of a Bogue Rathttp://airtripper.com/698/resistance-wire-heated-build-platform-diy-tutorial/#comment-645 Thu, 17 Apr 2014 14:08:20 +0000 http://airtripper.com/?p=698#comment-645 […] I started testing the Nichrome wire heating element I based it off Airtripper’s Blog which worked out to a .85 ohm target for the table @ 200 watts/13V.  I bugger’d up the math […]

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Comment on Resistance Wire Heated Build Platform DIY Tutorial by Mark Heywoodhttp://airtripper.com/698/resistance-wire-heated-build-platform-diy-tutorial/#comment-632 Sun, 23 Mar 2014 18:19:45 +0000 http://airtripper.com/?p=698#comment-632 I’m looking at using borosilicate in the future. People have talked about sandblasting the surface to improve bonding to plastic; I’ll probably just add a layer off window glass on top when printing PLA.
I’m hoping borosilicate will work as a hot plate for surface mount soldering, it’s a project I’ve got lined up.

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Comment on Resistance Wire Heated Build Platform DIY Tutorial by chethttp://airtripper.com/698/resistance-wire-heated-build-platform-diy-tutorial/#comment-631 Sun, 23 Mar 2014 02:04:30 +0000 http://airtripper.com/?p=698#comment-631 thanks for getting back so quick! have you looked into printing on borosilicate glass (like pyrex)? that way you’d get over the temperature restrictions of window glass you were talking about?

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Comment on Resistance Wire Heated Build Platform DIY Tutorial by Mark Heywoodhttp://airtripper.com/698/resistance-wire-heated-build-platform-diy-tutorial/#comment-630 Sun, 23 Mar 2014 01:13:00 +0000 http://airtripper.com/?p=698#comment-630 Glass (window) is chosen because PLA material sticks directly very well too it. Also, glass is not electrically conductive, which means bare resistance wire can be used safely without risk of shorting.

Using another type of build surface might mean having to prepare the surface between each printing session. However, if using plastic other than PLA, this will be the case anyway.

A more thermally conductive platform would be of metal type, and this will not work safely using resistance wire as the heating element, it is unlikely it will create much power saving over glass. The best way to reduce power, is to reduce the size of the heated build platform.

Mark

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Comment on Resistance Wire Heated Build Platform DIY Tutorial by chethttp://airtripper.com/698/resistance-wire-heated-build-platform-diy-tutorial/#comment-629 Sun, 23 Mar 2014 00:27:13 +0000 http://airtripper.com/?p=698#comment-629 Do you have to use glass? Could you use something more thermally conductive and use less power to get the plate to temperature?

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Comment on Marlin Firmware v1, Basic Configuration Set-up Guide by Mark Heywoodhttp://airtripper.com/1145/marlin-firmware-v1-basic-configuration-set-up-guide/#comment-626 Sun, 09 Mar 2014 00:31:13 +0000 http://airtripper.com/?p=1145#comment-626 Hello Chris,

Glad you got sorted, the jumpers are easy to miss since they’re hidden.

I’ve tried the auto bed levelling but abandoned it, not really needed for my type of 3d printer. I don’t think the servo implementation is very popular, using the hot end as the end stop seems to be better, especially with the delta type 3d printers.

According to the comment in the Marlin firmware code, the probe servo is only switched on during movement. So, why the servo is twitching, it’s a mystery to me for now. However, could a stepper motor nearby cause the twitching?

Mark

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