I have mistaken Vin for the 5V power pin.

I though Vin was to provide a regulated 5V to the arduino, but really it is 7-12V that goes through a voltage regulator turning it into 5V or 3.3V.

So my diagram is false as if 5V goes to Vin arduino might not operate as expected (requires 7-12V on Vin)


Ok in theory If I was using 7V power supply that goes to Vin as well as motor instead of 5V.
Will the PWM cause changes to the 7V power supply affecting the arduino. (pulse high and low) (duty cycle)

Look at attached image, that is how I wanted to connect arduino and motor to 5V supply.

This is what I was thinking instead of having a separate power source for the motor, I would use the same 5V power source the arduino is using. Then with the arduino PWM I would control the motor.

Will the PWM cause problems for the arduino power as the motor and arduino will share a 5V line.

You got confused.
Duplicate post I could not delete myself.

5V from bench powersupply goes to arduino Vin as well as dc motor.

IT DOES NOT GO FROM BENCH TO ARDUINO TO MOTOR   NO!!!

5V from the bench power supply (upto 3A current) to both arduino Vin and 5V dc motor.

The arduino will also control motor via pwm.
 
Is there anything wrong with this? Will connect a diode across terminals to block back emf and a 0.1microfarrad capacitor for noise (read from herehttp://www.pololu.com/docs/0J15/9)


Please don't be confused, the motor is NOT powered via the 5V power pin from the arduino

5V from the bench power supply (upto 3A current) to both arduino Vin and 5V dc motor.

The arduino will also control motor via pwm.
 
Is there anything wrong with this? Will connect a diode across terminals to block back emf and a 0.1microfarrad capacitor for noise (read from herehttp://www.pololu.com/docs/0J15/9)


Please don't be confused, the motor is NOT powered via the 5V power pin from the arduino

5V (power supply) =======|-----> 5V to Arduino Vin ------>---|
                                        |                                                |
                                        |-----> 5V to DC MOTOR <-PWM---|

What is the smallest font size capable of showing some of the extended ASCII characters.
Is Extended ASCII Characters display via Small Pixel Font such as 5x7 or 5x6 possible?

Does anyone know how to convert .ttf font to binary or hex.
here is the font that caught my eye: http://www.dafont.com/minecraftia.font
There are other good ones on there too.

This is the format am looking for, lets say '1'

0b00001000
0b00101000
0b01001000
0b00001000
0b00001000
0b00001000
0b01111111

if you squint your eyes it might be easier to see a shape of '1' in that array of bits.

[readable for both Upper and lower case letters]

Ok 3 pixels is too small.

What is a small pixel size font where the characters are easily readable and unique(not mistakable with others)

I am looking for minimum pixel height but readable for both Upper and lower case letters and some special characters like @ or % etc.

Oh dear it looks aweful.

lol why did I expect any better  

Thanks for the quick response.

What is the smallest font size capable of showing some of the extended ASCII characters.
Is Extended ASCII Characters display via Small Pixel Font such as 5x7 or 5x6 possible?

I am looking for a real small font.

What is the smallest font size in terms of pixels, widths and height.

I really want short height, less than 4 pixels high? Is that even possible ?

Yes it works, I wrote my own code to give me the RPM based on the output from this.

Also used pwm to change the speed for the motor and this was confirmed by the rpm read.


So can anybody help me understand this code?

What have you got connected to pin 2? i.e how are you triggering this thing?

photo/light gate.   When a fin blocks it, it sends a high logic to arduino.

If the code is correct, then it must be operational - I don't understand the point of your question.

I tried using it but nothing happened.

I expected the message to show but nothing. The laser didn't even blink, I tried it also with an led and same thing.

Maybe there is a mistake of I am missing something, like a on feature.
This is why I need help, if someone could explain the code. When I see arrays and stuff I get confused.

first of I was confused there are two laserpin declared but in the video he has only one.

It appears from the code that the second laserPin is only ever written LOW, so I don't think it really matters.

What must I do to make the code operational assuming it is all correct. 

You don't have to down load it to look at it But the OP is really lazy not to post it.
And what help does he need with the code looks fine and it worked in his video.

So the problem is how you make this work on his uno where to hook what and the like.


https://code.google.com/p/aguaviva-libs/source/browse/arduino/sketches/laserpojector/laserpojector.pde

yep that is my question. Any ideas ? first of I was confused there are two laserpin declared but in the video he has only one.