With only one writing thread, and the others merely read, Depends on what the functionality does. Is it safe to use obsolete data!

Is only a single write operation required? Such as only writing...

You really should start your own post with this as other then communications it's a different project!

You first need to determine how you are going to detect trash level. Keep in mind a particle...

Your problem is pretty simple! Think of it as a kind of two dimensional array. You can solve it by calculation but visualy.
<i>
--- N = 1

1 X N = 2

1 XX
2 X N = 3

1 XXX

There are whitepapers on the subject. Check out I.E.E.E and other organization(s) publications.

Comes down to vectorizing facial features found on the face and storing those vectors and searching...

Use fmod to handle angles set > < 360 degrees.

If you decide to use trig functions don't forget to convert degrees to radians.

PI is 180 degrees.
+/- PI.

There are several algorithms. Here are a couple...

N degree angle passing though point B is a line from + infinity to - infinity. Which side of the line is point A?

Inverse Tan y/x gives you...

Become a student member of I.E.E.E.

www.ieee.org

Write your conceptual design specification first.
Then get a NDA.
Raid your finanacial reserves.
Then get (paid for) engineering feedback.
Then write (or pay someone to write) the technical...

RS-422 or RS-485 would be an appropriate serial connection. Handles distance. Since it sounds like you're putting a processor (may I recommend a PIC) directly attached to the sensor(s) you may...

Indoor or outdoor parking lot? Sunlight washes out infrared!

Feel like digging up a parking lot, then halleffect sensors. A single loop will detect motion of magnetic metal. A double loop acts as...

So you have no electronics background so you're looking for off the shelf components so as to build your project. You want to do sensor monitoring but keep focusing on a camera, which you really...

0.25 = 0x3e800000
0.01 = 0x3c23d79a = 0.0099999998

Or fixed point BCD (2 places)
0.25
0x0000000025

You are talking about floating point.
Dependent upon the data format typically IEEE
32-bit SPFP Single-Precision Floating-Point
64-bit DPFP Double-Precision Floating-Point
80-bit ...

A long time ago in a far away land there was a castle the peasants called the crt. It was great but soon it was too small for the growing hordes of dots and so the king called to the lands for...

Sounds like homework questions to me!

Do web search or read your book!

You will require a semaphore to keep both threads from accessing the same data simultaneously.
Thread#1

{BLOCK}
Var += 4;
{UNBLOCK}


Thread#2