I have several JR/Spektrum DS821 digital servos and am just trying to figure out the proper code to setup control on one of these guys.
I have tried using the servo library, but I'm not getting the results I expected, I seem to only have control of around a 90º range of motion.
Does anyone have any suggestions as to how I can test the full range of motion on this standard size digital servo?
What am I doing wrong, perhaps the servo.attach(9, min, max) values need to be changed but what to?
What do the specs for the servos say the pulsewidth should be?
Link to actual product and all the information I have on it and/or could find.
http://www.spektrumrc.com/Products/TechnicalSpecs.aspx?ProdID=SPM3702
It seems to be exactly the same as this one from JR
http://www.jrradios.com/Products/Default.aspx?ProdID=JRPS821
I can't find any spec's other than the links I just posted.
Edit:
Unless I'm dumb and can't read the PWM info on either site. I will admit I am new to Arduino and Servos but definitely not new to writing software, the Arduino language is simple as can be compared to some of the other languages I code in.
I'm just trying to make sense of Arduino vs. Digital Servo, cheaper digital servo, though it has great reviews.
I just got this back after a previous email with these guys. Personally I doubt I will buy from http://www.spektrumrc.com/ again as I truly believe they are just rebranding either the JR or something else that JR is rebranding because their first email told me they knew nothing about their own product plus they respond from a different website/webstore than their website.
The did however mention it IS capable of 180 degrees. Now to figure out the min/max pulse widths to achieve such a result.
Whether or not the server has to be hacked for a full 180 is a different story, they didn't say, lol.
Dear Jared,
Thank you for contacting Horizon Hobby. We appreciate your interest in our product and value any feedback you have.
I spoke to a radio technician and he advised me that the DS821 will travel 180 degrees maximum.
If you have any other questions, please let us know!
OK, so how far did you get with experimenting with the default values for pulse widths in the "attach"?
You could even cobble together a simple sketch using delays, driven by numeric values from the serial monitor, which might get you there quicker. May prove useful in the future too. (FWIW, it's what I'd do)
Pretty poor customer service. >:(
horizonhobby.com sells JR exclusively and Spektrum is a JR product. If you go to JR's website and scroll down you will find a link to horizonhobby's site on their main page.
Hope that helps.