Amiga Mouse Original Tank Mouse Optical sensor Faulty Help please.

[Audronic]

Hi @darkage and @Pat the Cat.

Problem Sorted  ?
The load on the IR Reciever was to low (Original Design) which was 670 Ohms.
Now modified to 2.7K ohms as per Pavel Ruzicka's Circuit.
I have changed all 5 Resistors to this standard.

Thanks for all your help.
Ray

[darkage]

Problem Sorted  ?
The load on the IR Reciever was to low (Original Design) which was 670 Ohms.
Now modified to 2.7K ohms as per Pavel Ruzicka's Circuit.
I have changed all 5 Resistors to this standard.

Thanks for all your help.
Ray

Odd.   Was the board worked on before ?   Im not sure if Pavel's schematic would be 100% correct, best way would be to check another untouched tank mouse for values.  Or maybe your mouse was built on a friday afternoon in the factory and someone put in the wrong values.  Or maybe overtime as the optical sensor ages it might become less senstive and a load change has done some magic.

Happy its working now

[Audronic]

@darkage

It looks like the 3 that I had problems with, were all with the low value resistors ??
Pavel's Circuit did not match the Old Tank Mouse, But i used it as an example of how a mouse could be wired.

Thanks    Ray

[darkage]

A larger resistive load will make it more sensitive.  

Theory here, key point towards the end.  

http://learn.parallax.com/tutorials/robot/shield-bot/robotics-board-education-shield-arduino/chapter-6-light-sensitive-11

If its the original resistors in there from the factory, the phototransistor may be breakingdown with age and is drifting out of spec  ? See how you go, if it happens again then look at the sensors.

[Audronic]

@darkage

Ok Thanks for the journey down the Ohms law road I haven't reviewed that for a lot of years.
Ps :- I am an Old techo, and i still like some of these challenges.
Thanks again

Ray

[Pat the Cat]

Hi @darkage and @Pat the Cat.

Problem Sorted  ?
The load on the IR Reciever was to low (Original Design) which was 670 Ohms.
Now modified to 2.7K ohms as per Pavel Ruzicka's Circuit.
I have changed all 5 Resistors to this standard.

Thanks for all your help.
Ray

Fix is a fix. :drink:

[Audronic]

@Pat the Cat

Thanks for your help.
All sorted  (At the Moment)

Thanks  Ray