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4 pin opto's

NelsonRap

4 pin opto's
October 07, 2011 04:41PM

Registered: 13 years ago
Posts: 862

Started wiring up our Prusa and found on the sanguinololu board the opto headers only have 3 pins but the optos have 4 wires? Anyone run into this before?

__________________________________________________________________________
Experimenting in 3D in New Zealand

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NelsonRap

Re: 4 pin opto's
October 07, 2011 08:31PM

Registered: 13 years ago
Posts: 862

Sorted

__________________________________________________________________________
Experimenting in 3D in New Zealand

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marnargulus

Re: 4 pin opto's
October 10, 2011 01:44PM

Registered: 12 years ago
Posts: 129

Please explain in case someone else has this issue.

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NelsonRap

Re: 4 pin opto's
October 10, 2011 02:46PM

Registered: 13 years ago
Posts: 862

There are 2 positive pins that need to be wired together

__________________________________________________________________________
Experimenting in 3D in New Zealand

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marnargulus

Re: 4 pin opto's
October 11, 2011 08:57AM

Registered: 12 years ago
Posts: 129

Which wires and what model of opto did you get?

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NelsonRap

Re: 4 pin opto's
October 11, 2011 05:55PM

Registered: 13 years ago
Posts: 862

It is these opto's Here and the positive pins are the ones wired together, there is a symbol on the end of the opto

__________________________________________________________________________
Experimenting in 3D in New Zealand

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NelsonRap

Re: 4 pin opto's
October 18, 2011 01:26AM

Registered: 13 years ago
Posts: 862

Hmm not sure whats going on though they don't seem to be working with Sprinter and sanguino at the moment

__________________________________________________________________________
Experimenting in 3D in New Zealand

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Traumflug

Re: 4 pin opto's
October 18, 2011 08:42AM

Registered: 13 years ago
Posts: 7,616

You can measure the signal going into the ATmega with a multimeter. Low is < 1V, High is > 3V.

You want at least a current limiting resistor on the LED side, for an application with LED, see [reprap.org]

These optical interrupters can be attached to a Gen6 directly, because Gen6, unlike all other electronics, has the required resistors on the main board.

Generation 7 Electronics	Teacup Firmware	RepRap DIY

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NelsonRap

Re: 4 pin opto's
October 18, 2011 02:47PM

Registered: 13 years ago
Posts: 862

Hmm but I'm trying to hook them to a Sanguino that only has 3 pins which is why we wired the two + pins together

__________________________________________________________________________
Experimenting in 3D in New Zealand

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Traumflug

Re: 4 pin opto's
October 19, 2011 06:10AM

Registered: 13 years ago
Posts: 7,616

Quote

Hmm but I'm trying to hook them to a Sanguino that only has 3 pins which is why we wired the two + pins together

You need an endstop PCB, then. At least two designs are available.

Generation 7 Electronics	Teacup Firmware	RepRap DIY