implementing servos

[Nicholas Quihampton]

is it possible to add the controls for 3 servo's to the UI

[trouch]

yes it's possible

https://code.google.com/p/webiopi/wiki/CUSTOMIZE

                // Only for Chrome and Safari, create a slider that pulse out a -45 to +45° angle on GPIO 9
                button = webiopi().createAngleSlider(9);

                content.append(button);

On Fri, Mar 8, 2013 at 7:41 AM, Nicholas Quihampton <bra...@bigpond.com> wrote:

is it possible to add the controls for 3 servo's to the UI

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[Nicholas Quihampton]

i added that to index.html  and nothing appears on the cambot page

[trouch]

check the js console output

--

[Nicholas Quihampton]

I dont know what you mean by this

On Friday, 8 March 2013 17:41:49 UTC+11, Nicholas Quihampton wrote:

[Nicholas Quihampton]

what is the js console output

[trouch]

javascript console.

--

[Nicholas Quihampton]

i get this when i try to start it

http://pastebin.com/Uja0y10T

On Friday, 8 March 2013 17:41:49 UTC+11, Nicholas Quihampton wrote:

[Nicholas Quihampton]

i have tyred to change the pin number but i still get the same message

On Friday, 8 March 2013 17:41:49 UTC+11, Nicholas Quihampton wrote:

[trouch]

see https://code.google.com/p/webiopi/issues/detail?id=20&can=1

--

[Nicholas Quihampton]

thanks, i updated to latest version and it fixed that error that i was getting but the slider still wont appear on the page 

On Friday, 8 March 2013 17:41:49 UTC+11, Nicholas Quihampton wrote:

[trouch]

slider only works with chrome and safari.

--

[Vitor Carvalho]

Hello,

how slider works?

When I change it to +45 for example, what happens in the python side?
It's possible to change the range from -45:+45 to 0:180?

Thanks!

[trouch]

PWM frequency is 50Hz, a pulse each 20ms (period)

Servo angle implementation in webiopi use futaba standard, which is the most used :

0° (neutral) => 1520µs = 1.52ms

with a 400µs / 45° travel

-45° => 1120µs = 1.12ms

+45° => 1920µs = 1.92ms

This come from R/C, where axis can have positive and negative values.

You can override Javascript function :

WebIOPi.prototype.createAngleSlider = function(gpio) {

var slider = $('<input type="range" min="-45" max="45" step="1">');

slider.attr("id", "angle"+gpio);

slider.bind("change", function() {

w().pulseAngle(gpio, slider.val());

});

return slider;

} actually the server side convert the angle into a pulse duration to make a ratio over the period. it then uses the pwmWriteRatio function to write a duty-cycle ratio between 0.0 (0%) and 1.0 (100%) be careful with your servo limit. you will draw too much current if you go bounces. it can damage the servo and your power. you should use w().pulseRatio(...) Javascript function, to make your own slider calibrated for your servo. Eric.

[Vitor Carvalho]

Hi Eric, thanks for your reply.

I read in the wiki, that pulseAngle waits a angle between -45 and +45, I have to override this function too?

ps.: The servo motor is tremendous, even if I do not move the slider.

I'm using the raspian ocidentallis and in this distribution, you can change the pwm by editing the file
echo '90' > /sys/class/rpi-pwm/pwm0/servo

the servo is stopped this way. It's possible to let the servo stopped with slider?

[trouch]

"tremendous" ?

[Vitor Carvalho]

sorry my english.
the servo it's shaking a lot, even I don't move the slider

[Daniele Cacciabaudo]

Hi Eric, this issue happen to me too! The servo shaking even the slides don't move.

[trouch]

see bugtracker

On Wed, Apr 10, 2013 at 12:31 AM, Daniele Cacciabaudo <danieleca...@gmail.com> wrote:

Hi Eric, this issue happen to me too! The servo shaking even the slides don't move.

[Daniele Cacciabaudo]

I try to update the RPIO.PWM as recommended

in the link http://www.raspberrypi.org/phpBB3/viewtopic.php?t=36670&p=315941 (issue 42), but nothing has changed.

Do you have any advice for me?
Thanks in advance

[trouch]

there is nothing to use webiopi with RPIO.PWM out of the box.

you can :

wait for a later webiopi release

or

make a custom script with some macros to call RPIO.PWM functions etc...

there is other discuss on the google group about pwm

[Daniele Cacciabaudo]

thank you very much for your reply. and good continuation with the development of webiopi!! i stay tuned.

[Nicholas Quihampton]

i have tested it with both safari and google chrome and the slider still won't appear in either web browsers 

On Friday, 8 March 2013 17:41:49 UTC+11, Nicholas Quihampton wrote:

[Daniele Cacciabaudo]

Meanwhile , i create a custom script with some macros to call RPIO.PWM functions.

it works very well!

I have attached the files. I hope they can be helpful to other people.

Il giorno mercoledì 10 aprile 2013 22:37:36 UTC+2, Daniele Cacciabaudo ha scritto:

thank you very much for your reply. and good continuation with the development of webiopi!! i stay tuned.

On Wed, Apr 10, 2013 at 9:40 PM, trouch <tro...@trouch.com> wrote:

there is nothing to use webiopi with RPIO.PWM out of the box.

you can :

wait for a later webiopi release

or

make a custom script with some macros to call RPIO.PWM functions etc...

there is other discuss on the google group about pwm

On Wed, Apr 10, 2013 at 9:28 PM, Daniele Cacciabaudo <danieleca...@gmail.com> wrote:

I try to update the RPIO.PWM as recommended

in the link http://www.raspberrypi.org/phpBB3/viewtopic.php?t=36670&p=315941 (issue 42), but nothing has changed.

Do you have any advice for me?
Thanks in advance

On Wed, Apr 10, 2013 at 8:13 AM, trouch <tro...@trouch.com> wrote:

see bugtracker

On Wed, Apr 10, 2013 at 12:31 AM, Daniele Cacciabaudo <danieleca...@gmail.com> wrote:

Hi Eric, this issue happen to me too! The servo shaking even the slides don't move.

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[trouch]

that's the idea, until I improve PWM natively in webiopi.

2 suggestions :

- use webiopi 0.6 script loading facility and syntax, you'll find a cambot2 folder in examples to start with

- remove GPIO.pulseRatio calls

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[Daniele Cacciabaudo]

Ok, thank you!

Inviato da iPhone

[Andrés Sanhueza]

Hi daniele, thx for uploading those files =) 

But i have a question, once you have added the macros in the rasprover.py (server.addMacro(go_forward)) , how do you call them from javascript? 
i cant see the index.html :( 

thnx!

On Saturday, April 13, 2013 2:18:07 AM UTC-3, Daniele Cacciabaudo wrote:

Meanwhile , i create a custom script with some macros to call RPIO.PWM functions.

it works very well!

I have attached the files. I hope they can be helpful to other people.

Il giorno mercoledì 10 aprile 2013 22:37:36 UTC+2, Daniele Cacciabaudo ha scritto:

thank you very much for your reply. and good continuation with the development of webiopi!! i stay tuned.

On Wed, Apr 10, 2013 at 9:40 PM, trouch <tro...@trouch.com> wrote:

there is nothing to use webiopi with RPIO.PWM out of the box.

you can :

wait for a later webiopi release

or

make a custom script with some macros to call RPIO.PWM functions etc...

there is other discuss on the google group about pwm

On Wed, Apr 10, 2013 at 9:28 PM, Daniele Cacciabaudo <danieleca...@gmail.com> wrote:

I try to update the RPIO.PWM as recommended

in the link http://www.raspberrypi.org/phpBB3/viewtopic.php?t=36670&p=315941 (issue 42), but nothing has changed.

Do you have any advice for me?
Thanks in advance

On Wed, Apr 10, 2013 at 8:13 AM, trouch <tro...@trouch.com> wrote:

see bugtracker

On Wed, Apr 10, 2013 at 12:31 AM, Daniele Cacciabaudo <danieleca...@gmail.com> wrote:

Hi Eric, this issue happen to me too! The servo shaking even the slides don't move.

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[trouch]

server.addMacro is oldshool

you now have python decorators to declare macros in a custom script.

https://code.google.com/p/webiopi/wiki/PYTHONSERVER

Then, to answer you : https://code.google.com/p/webiopi/wiki/JAVASCRIPT#WebIOPi.callMacro(macro,_[args[,_callback]])

Eric / trouch.

[Andrés Sanhueza]

Thank you ! 

But eric, got another question, in order to move a servo with PWM, i need 20 ms betweeen each Pulse(50hz) (regardless the dutycycle), but the function 
webiopi.pulseRatio(gpio), gives a 100 ms separation betweeen pulses , i know i can modify this with RPIO.GPIO from python (that´s why i asked in the first place), 
but there isnt a simple way in order to change de frequency of the pulses from Webiopi?

thank so much all your work , greetings from chile =)  

[trouch]

WebIOPi PWM implementation uses a 50hz signal

WebIOPi DOES NOT use RPIO.GPIO

[Andrés Sanhueza]

Eric, im measuring CreateAngelSlider(...) with and oscilloscope and it gives a 40ms period between pulses =( , i guess i´ll try to use macros to call RPIO functions

[Andrés Sanhueza]

Thank you for your replies!