Web-controlled watering can with siteplayer and arduino--- make money online

This is an interactive art project that I have been building for an upcoming exhibition.  The idea for a web-controlled watering can come from the first "iphone watering can" that I helped build with a friend for Maker Faire a couple years ago.  Search the internet/youtube for "iphone watering can" for details.

This new version uses a different drive mechanism and a PD control loop to make the watering can track the desired position in realtime.  The interface works with any webkit browser.  My collaborator and I have discussed using the iphone or android accelerometers to achieve control through phone tilting.  I'm not sure if the tilt data is available to the web browser, though, and we are trying to make the interface run on as many platforms as possible.  Any ideas?

The siteplayer webserver is extremely old technology and has many problems, but does work.  I would explore using a hacked WRT router in the future for similar projects.

okay in this video I'm going to show

this project that I've been working on

it's a web controlled watering can so

let me just give you a demonstration

here of how this thing works you'll see

that as the can is rotated in the web

browser the actual watering can tip is

over mechanism over there so I got some

help

with the client side of this I don't

know a whole lot about the WebKit

programming that was done but basically

this web app sends commands to a web

server the web server then sends those

commands on to an Arduino and the

Arduino controls the motor that's

driving the watering can okay so this is

the web server module it's a net media

site player and it's actually quite an

old piece of technology but when I

started this project I was looking for a

completely self-contained embedded web

server and this seemed to be the easiest

way to go a friend of mine pointed out

that certain wrt routers can be set up

with like a custom version of Linux and

you could actually use that as a web

server since those have a serial port

hidden inside them so that that actually

might be a better solution but I didn't

know about that at the time and ended up

buying one of these the nice thing is

that they it boots up extremely fast I

mean it's it's almost instant on and it

seems to be working pretty well I've had

experience with these in the past and

made my own board for one and it had a

lot of reliability problems so this time

I bought the the whole development board

which comes with the Ethernet jack which

contains like a transformer inside there

and this one seems to be working pretty

well so this is the thing that's

actually serving that web page that you

saw and when the web browser sends

commands to the server through get

requests this thing just parses that

into a serial data

sends the cereal out to the Arduino so

it's really just one wire you can even

see I cut the other side of the link off

because I didn't need it and this chip

was getting confused with my debug

commands that were being sent from the

Arduino to the computer so it's just one

direction serial from the webserver to

the Arduino and I'm using com1 on the

Arduino I also decided to go with 9600

baud just because that's what this thing

defaults to and it's actually

surprisingly difficult to change it and

store that change in non-volatile Ram

like I say this thing is kind of kind of

old and outdated but it is working ok so

after we have the serial commands from

those server get requests into the

Arduino the Arduino drives this motor

control circuit here and the motor

control circuit powers the watering can

so for example one of the commands that

comes in from the web browser is a

number of 0 to 100 which describes where

the watering can should be and the

Arduino has information coming from the

watering can of where the position

actually is and it uses a PID loop to

just adjust the motor control to stand

the watering can to the right position

so it's closed loop servo control and as

I remember I used almost entirely

proportional control the integral

control really didn't work that well I

had a lot of oscillation problems so I

think I might have used a little bit of

differential control to cut down on an

overshoot so it's actually a PD

controller the actual switching device

that I use to drive the motor is an L 60

203

it's an H bridge in one package and it

even handles its own gate driving

circuitry so all you have to do is plug

this into a power source in this case

I'm using a very small computer power

supply and that sends 12 volts into the

drive circuit is just a smoothing cap 12

volts go into the L 60 203 and the

Arduino is able to control this thing

with just five volt signals so there's

- signals going in tech these are it

right here one two spin the motor

clockwise and one two spin the motor

counterclockwise and the Arduino just

outputs PWM on the appropriate pin to

make the motor turn okay so to track the

position of watering-can

I'm using just a potentiometer here and

it's just an analog signal that goes

back to the Arduino so that it always

knows where the water and can is and as

they can moves it just turns that pot

it's actually quite solidly mounted so

the position is is very accurately

measured the motor is a an electric

window motor for a car I think it was

probably for a Honda since it's a den so

part they were made in Japan and this

wheel here is a caster that I bought at

the hardware store and machined a groove

into the rubber and then press fit a

Adel wrench after there and then press

fit the shaft onto the motor okay I

think I used a set screw on there too so

of course one of the benefits is that

once this thing is controllable by any

web-browser you can use mobile devices

like this Android g1 and control the can

that way you can see that the screen

update on this phone is actually not

that good because the CPU is is kind of

outdated in this phone already but it

does work out iPhones and anything with

a WebKit browser

another part of this project is this

water vortex tube that I made with the

help of the friend and when the motor is

started the fan inside is spun around

and creates a vortex so eventually I'll

have a separate web page interface for

this separate from the watering can but

for now I'll just show you at the same

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