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Steering rig start

Started by h106frp, January 24, 2015, 11:29:48 AM

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h106frp

March 05, 2015, 09:12:23 PM #60 Last Edit: March 05, 2015, 10:04:48 PM by h106frp
Thanks for the link, i will see if they have any good ideas.

Semi conductor silicon gauges have been around a long time and can be used the same way as conventional foil gauges but with much higher outputs.

http://www.kulite.com/products.asp?p=4-0 look at bottom link

Bare gauges for adhesive mounting from;

http://www.appmeas.co.uk/index.html

which are a UK company.

I have considered the simple force sensors again as the forces are much lower in this application method, they are the same diameter as the master cylinder housing and after a bit of reading up the output can be reasonably linearized with an external op-amp. The sensor could be placed in the bottom of the master cylinder bore and loaded in a similar way with a simple soft faced 'plug'. Could be a very simple option to explore in the future.


Small general progress update; the steer axis to motor mounting plate is now finished and includes a steering lock limit. Most of my spare time has been spent implementing 2 I2C DACS into my microcontroller for controlling the servo demand and cleaning up my host PC software for better function testing. Next task is a bit of electronics for level shifting the DAC signals to suitable voltages (0 to +5 to +-10volt)  for the servo controller and i am going to try the conductive paint method to modify the sweep of my feedback potentiometers to the correct angles.

doubledragoncc

Thanks for the Links. I need a 3 wire sensor for analog on my boards, +, - and output, so some sensors are no good. I have to wait to get more money to get the different types to play with as I need all I have to start up just my basic systems first. 3D printing aint cheap to start lol.

DD
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h106frp

The simplest way to get a 3 wire output is just use another resistor in series with sensing resistor and use it as a voltage divider, just like a potentiometer. For my load sensor this would gives me about 40mV change from the mean value for a 5V supply.

More graceful to use a half bridge (as above) and an op-amp which allows gain and offset adjustment, simple and cheap :) and it is what i will do for the clutch and brake circuit to interface to leo's board.

h106frp

Well, a bit of op-amp magic and i have a nice 0-5 volt output force sensitive brake and clutch without any messy hydraulics  :) One more step forward! Time to commit some of these circuit to veroboard - time to warm up the iron ;D

poumpouny

Been reading whole 5 pages :o and just ask where is this project now ? i would love to see it in use !

Nicotine

Quote from: poumpouny on June 16, 2017, 08:47:52 AM
Been reading whole 5 pages :o and just ask where is this project now ? i would love to see it in use !
i am Curious, please update the video when you play with your project
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