Builing a HUD for insp

***Beanie*** · 13th July 2005, 13:54

Quote: (Originally Posted by Pierre Farrugia)

Hello again,

Has anyone who uses a 4th cell for Vr3 knows to which pins is the cell connected in 7 pin connector plug ? I am trying to sourse a female 7 pin connector that can be attached to the 4th cell 7 pin connector . On mine there is written Scher but could not find anything on the net!

Regards

Pierre Farrugia

http://www.fischerconnectors.co.uk/

not sure whihc ones but I think 103 series

Pierre Farrugia · 14th July 2005, 21:29

Hello again,

Now that I have read about oxygen sensors and how they work more in depth, I can say that I feel more confident in building a HUD. Most of the info come from here http://www.btinternet.com/~madmole/D...le/DMCells.htm . For building this project we already tried it out using 1volts and adding and decreasing due to power supply range and worked perfectly. Next step is to try it with millivolts which would be an other story! For this circuit we are going to use a PIC and programme it accordingly. Have someone who build something similar got away with it without using an amplifier to step up the voltage?
Would you consider a vibration motor in your HUB ?

Regards

Pierre Farrugia

PeteS · 15th July 2005, 07:09

Quote: (Originally Posted by Pierre Farrugia)

For building this project we already tried it out using 1volts and adding and decreasing due to power supply range and worked perfectly. Next step is to try it with millivolts which would be an other story! For this circuit we are going to use a PIC and programme it accordingly. Have someone who build something similar got away with it without using an amplifier to step up the voltage?

My suggestion is to scale the input by putting a low gain op-amp between the cells and the MicroPic. The A-D on the MicroPic should then work just fine. The op-amp will also act as a buffer. Run the op-amp from the same supply as the MicroPic. Then you can't over drive the input.

Just my opinion.....

13th July 2005, 13:54	#31 (permalink)
*Beanie* give a man an inch....... Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Vision Join Date: Jan 2005 Location: In da house! yeah baby! Posts: 3,174	Quote: (Originally Posted by Pierre Farrugia) Hello again, Has anyone who uses a 4th cell for Vr3 knows to which pins is the cell connected in 7 pin connector plug ? I am trying to sourse a female 7 pin connector that can be attached to the 4th cell 7 pin connector . On mine there is written Scher but could not find anything on the net! Regards Pierre Farrugia http://www.fischerconnectors.co.uk/ not sure whihc ones but I think 103 series __________________ Beanie Gallery Admin & Library Assistant. www.outlawdivers.org.uk www.beandiving.co.uk www.beanengineering.co.uk
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14th July 2005, 21:29	#32 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	Hello again, Now that I have read about oxygen sensors and how they work more in depth, I can say that I feel more confident in building a HUD. Most of the info come from here http://www.btinternet.com/~madmole/D...le/DMCells.htm . For building this project we already tried it out using 1volts and adding and decreasing due to power supply range and worked perfectly. Next step is to try it with millivolts which would be an other story! For this circuit we are going to use a PIC and programme it accordingly. Have someone who build something similar got away with it without using an amplifier to step up the voltage? Would you consider a vibration motor in your HUB ? Regards Pierre Farrugia __________________ Pierre Farrugia My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
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15th July 2005, 07:09	#33 (permalink)
PeteS Consent Issued! Current Rebreather/s: Inspiration Classic Inspiration Vision Other Rebreather/s: Join Date: Jun 2005 Location: New Zealand Posts: 533	Quote: (Originally Posted by Pierre Farrugia) For building this project we already tried it out using 1volts and adding and decreasing due to power supply range and worked perfectly. Next step is to try it with millivolts which would be an other story! For this circuit we are going to use a PIC and programme it accordingly. Have someone who build something similar got away with it without using an amplifier to step up the voltage? My suggestion is to scale the input by putting a low gain op-amp between the cells and the MicroPic. The A-D on the MicroPic should then work just fine. The op-amp will also act as a buffer. Run the op-amp from the same supply as the MicroPic. Then you can't over drive the input. Just my opinion..... __________________ Pete S. http://www.steggle.co.nz Every silver lining has a cloud
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