Personalized Water Wave Generator Tank, Ya Bilge Scum
Welcome me matey to Davy Jones' miniature locker. To analyze yer wave and buoyancy mechanics while we plunder wenches, drink Rum and supplement with vitamin C, we rigged an Arduino Micro, (2) servos and potentiometer with if and for codes to generate various wave frequencies upon the sovereign seas (in a small acrylic case cast from a picture frame). Arrr--gh!
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ino - 2.25 kB - 01/07/2016 at 23:16 |
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Vije Miller// Arduino Wave Tank II
// TVMiller
#include <Servo.h>
Servo left;
Servo right;
int pos = 20;
int back = 20;
int forward = 160;
int spe = 15;
int red = 6;
int green = 5;
int blue = 4;
void setup() {
Serial.begin(9600);
left.attach(2);
right.attach(3);
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);
pinMode(blue, OUTPUT);
left.write(back);
right.write(back);
digitalWrite(green, HIGH);
delay(1000);
digitalWrite(green, LOW);
delay(1000);
digitalWrite(red, HIGH);
delay(1000);
digitalWrite(red, LOW);
delay(1000);
}
void loop() {
int pent = analogRead(A0);
Serial.println(pent);
spe = map(pent, 0, 1023, 15, 1);
if (spe >= 10) {
digitalWrite(green, HIGH);
digitalWrite(blue, LOW);
digitalWrite(red, LOW);
}
else if (spe < 10 && spe >= 5) {
digitalWrite(green, LOW);
digitalWrite(blue, HIGH);
digitalWrite(red, LOW);
}
else if (spe < 5 && spe >= 1) {
digitalWrite(green, LOW);
digitalWrite(blue, LOW);
digitalWrite(red, HIGH);
}
for (pos = back; pos <= forward; pos += 1) {
left.write(pos);
right.write(pos);
delay(spe);
}
for (pos = forward; pos >= back; pos -= 1) {
left.write(pos);
right.write(pos);
delay(spe);
}
}
This mini-build was to me a lesson on how to manipulate numerous servos with in the same parameter to create a near unison effort. Looking at the Arduino sketch you will note that in the oscillating between left and right for function, we mapped the other position for the second servo so that the initial position defined by the for is then manipulated in to a value that we want mirrored by the second servo. You get all that? If you are a beginner (as I attest I am) then that sketch is a good cheat sheet on how to add more servos to a smooth movement.
// Arduino Wave Tank
// TVMiller
#include <Servo.h>
Servo left;
Servo right;
int pos = 20;
int post = 160;
int back = 20;
int forward = 160;
int red = 6;
int green = 5;
int blue = 4;
int slow = 8;
int fast = 4;
void setup() {
Serial.begin(9600);
left.attach(2);
right.attach(3);
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);
pinMode(blue, OUTPUT);
left.write(back);
right.write(back);
digitalWrite(green, HIGH);
delay(1000);
digitalWrite(green, LOW);
delay(1000);
digitalWrite(red, HIGH);
delay(1000);
digitalWrite(red, LOW);
delay(1000);
}
void loop() {
int pent = analogRead(A0);
Serial.println(pent);
if (pent < 200) {
digitalWrite(blue, HIGH);
digitalWrite(red, LOW);
digitalWrite(green, LOW);
for (pos = back; pos <= forward; pos += 1) {
left.write(pos);
right.write(pos);
delay(slow);
}
for (pos = forward; pos >= back; pos -= 1) {
left.write(pos);
right.write(pos);
delay(slow);
}
}
else if (pent > 200 && pent < 450) {
digitalWrite(blue, LOW);
digitalWrite(red, HIGH);
digitalWrite(green, LOW);
for (pos = back; pos <= forward; pos += 1) {
left.write(pos);
right.write(pos);
delay(fast);
}
for (pos = forward; pos >= back; pos -= 1) {
left.write(pos);
right.write(pos);
delay(fast);
}
}
else if (pent > 450 && pent < 700) {
digitalWrite(blue, LOW);
digitalWrite(red, LOW);
digitalWrite(green, HIGH);
for (pos = back; pos <= forward; pos += 1) {
post = map(pos, 20, 160, 160, 20);
left.write(pos);
right.write(post);
delay(slow);
}
for (pos = forward; pos >= back; pos -= 1) {
post = map(pos, 160, 20, 20, 160);
left.write(pos);
right.write(post);
delay(slow);
}
}
else if (pent > 700 && pent < 1023) {
digitalWrite(blue, LOW);
digitalWrite(red, HIGH);
digitalWrite(green, LOW);
for (pos = back; pos <= forward; pos += 1) {
post = map(pos, 20, 160, 160, 20);
left.write(pos);
right.write(post);
delay(fast);
}
for (pos = forward; pos >= back; pos -= 1) {
post = map(pos, 160, 20, 20, 160);
left.write(pos);
right.write(post);
delay(fast);
}
}
}
Hello, I have questions.
what is the scurvy in component?
How to control not to bend the wire to connect the servo motor with an acrylic plate?
I just realized you meant literally "Scurvy" I had forgotten I put in components. It was a joke. Scurvy is a condition commonly suffered by sailors from a Vitamin C deficiency.
The other question though, I am not certain from your wording but if you are asking about the steel wire connecting the acrylic to servo, it was a stiff steel wire (I don't remember the gauge) but nothing special as the pressure against the water was not immense because the volume of water was low.
Great Project ! However, I wonder how accurate it is compared to actual ocean waves, given the waves you create necessarly have to bounce back at the end of the tank ... which is not the case in a real ocean. Have you some comments on that ? How hard would it be to damp the wave energy at the end of the tank, simulating a coast ? Cheers !
It is a good question but we have to examine utility of the desk top wave generator. I built it to examine reflection actually (side note, the ocean does bounce back but on (perceptible) scales applicable to more confined areas, say a harbor or inlet, and technically globally but that's broader than applied here in discourse, of course, famous Mr. Ed.) I am researching a physics problem beyond the water and box it's in and I needed to see visually wave interaction in order to let my brain wrap around a problem I am having in my theory (which this DID help). I'm not a linguistic person, left brained, so I require spatial. My personal reason aside, this desk top model could have a series of channels at the end to dissipate some of the energy and better wave paddles that lift more than push, but for scalability to testing fluid dynamics around say a hull of a ship, it would have to be an impractically small model. Honestly, if the servos were quiet and I added some RGBs, it would make a soothing paper weight. Cheers indeed.
Thanks for the reply. Clearly, it helps to visualize what happens ...
I prefer the tangible over numeric probability...is what I told an angry professor of mathematics girl friend I once had a long time ago :)
Well, one possibility is to implement a "beach" at the end of the tank. That is, instead of the wall against which the waves are hitting, a very mild slope would have to be realized. This would be a passive solution. An active one (built using actuators, sensors and a computer) would be a lot more interesting. I feel like going for it :-)
Adding a beach gets cool. If it's got enough friction, you can get breaking waves and other stuff that VJ certainly doesn't need, but are useful for surfing.
Since what VJ trying to damp is the up-down motion of the waves, horizontal plates would work much better.
PJK
Hari Wiguna
With small modifications, this could be a really cool tank, for agitating PCB's when they're etching.
Thanks!