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Topic: Interactive Art Object Using Arduino+PIR sensors, hardware and code questions (Read 4 times) previous topic - next topic

Terry King


...
1x arduino, uno or Duemilanove (which do you guys recommend?)
5x whiper motor, car salvagejard
5x PIR sensor (http://www.samenkopen.net/action_product/927767/105314
5x solid state relays (link: http://www.sparkfun.com/products/10636)

Hi @Doerack,

First, I'm showing things from my own shop.. but that's the things I know best.

The list is good.

- Either version of Arduino with 328 chip will be OK.. 

- Wiper motors: do you know how much starting and running current they draw?? AND: What do you mean "2 directions?? Wiper motors rotate a crank inside and wipes move back and forth. If you reversed the motor the wipers would still move back and forth !!

- PIR sensors are good. Here are some at about =$6 US:  http://arduino-direct.com/sunshop/index.php?l=product_detail&p=173 These have 3 pins: +5V, Gnd, and a Digital output.

- Relays or Drivers to run the Wiper motors: This is more of a possible problem. Need to know the current to be handled. (The Solid State Relays shown above are for AC power and will not work with the wiper motors)... You need either relays or Power Transistor drivers.

Here are relays:  http://?.ws/YD-relay

Here are Power FETs which can be used to both switch and change the speed of DC motors like the wipers... :
http://arduino-direct.com/sunshop/index.php?l=product_detail&p=60

BUT: If you can get these things in Nederland without Customs that is probably better...

Your art installation sounds great...    Make sure you post photos of it working!

Regards, Terry King  ..On the Red Sea at KAUST.edu.sa
terry@yourduino.com  LEARN! DO! (Arduino Boards, Sensors, Parts @ http://yourduino.com

doerack

Terry thanks for your input. i would like to say that i like the way how this forum treats newbies. In holland the forums are not always kind to you.

To provide u guys with more input:

- I already have the Pir sensors, the ones from here: http://www.samenkopen.net/action_product/927767/105314

- About the Wiper motors: you have different ones, 1 type rotes a krank inside, but some others don't , they can rotate back or forth by reversing the motor.

Starting current: around 2 ah
running current they draw depends on the type, mine worked perfecty on a 7ah 12 battery, i will test tomorrow but i think 6 ah should be enough.

Here are some examples of other art projects (movies on youtube):
http://youtu.be/PP8wLhDlK_4
http://youtu.be/yjVZ8ycHULs
http://youtu.be/jCILljkp2PY
http://youtu.be/jwngFfZcrlk
http://youtu.be/2P8W7kgOpLE

Terry King

Quote
- About the Wiper motors: you have different ones, 1 type rotes a krank inside, but some others don't , they can rotate back or forth by reversing the motor.


So how do those reversible ones work?
How are they wired?
What do you need to do to control them? 
Do the have "limit switches" at the end of their movement??
Can you point to any online information about them?

Seems like they could be used for many things....

Window up/down motors are very useful also....

Regards, Terry King  ..On the Red Sea at KAUST.edu.sa
terry@yourduino.com  LEARN! DO! (Arduino Boards, Sensors, Parts @ http://yourduino.com

doerack

I'm trying to find the datasheet, but still no luck. it's an wiper motor from an hyundai exel (front window, the mechnics outside the motor created the back and forth motion)

i do know it operates between 12-13,8 volt, it uses max 7ah and starts up at 2 ah( but then with little torque).

The motor has 3 wires. 1= ground 2= gear 1 (slow), 3 = gear 2 (fast),  two and three rotate in the same direction. I thought ik would turn foward and reverse, but that only works when i switch the wires. thy don't have an inbuilt limit switch. But that is not a problem, but at some time the motor has to stop turning. Maybe by creating some code, or else an limit switch.

Does an window motor also turn in one direction?

I'll explain my idea: The motors hang on the ceiling, each with a string attached with a little pointed steel weight. In startmode the strings hangs totally on the ground. When visitors of the artwork approaches, the sensor picks up the signal, the motor starts turning, the string and weight roll up into the sky. It's stops at the top (near the motor), when the visitor walks allong the motor rolls down the string and go back to it's starting point (just above the ground). This progress has to repeat itself over and over again for each motor seperately.


That's the concept!  Now i just have to figure out how to create this. I already created a big useless machine that did more or less the same, but this one worked purely on mechanics, no arduino or other controlers involved. This one: http://youtu.be/jCILljkp2PY


Terry King

OK, So what I think I understand:

- You want motors to be able to act as a "winch" or "Crane", rolling a cable or string up, and rolling it back down again.

- So you need to be able to reverse the motors, right?

- You have some windshield wiper motors but you do not want to use the back-and-forth movement, and you will remove that part??

- You will have to attach some "drum" or "Spool" to wind the cable on.

- You need to know when the weight is at the top, and stop the motor.

- You need to know when the weight is at the bottom, and stop the motor. 

More questions:
?? How heavy is the weight
?? How long do you want it to take to go from bottom to top / back

OK, I see the Video and idea... 

- So the weight does not need to stop at the bottom??

Details!   That's what Engineering is about  :D
Regards, Terry King  ..On the Red Sea at KAUST.edu.sa
terry@yourduino.com  LEARN! DO! (Arduino Boards, Sensors, Parts @ http://yourduino.com

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