16 Channel PWM Servo Driver

Breakout boards, sensors, other Adafruit kits, etc.

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
ajpollme
 
Posts: 2
Joined: Wed Dec 26, 2012 9:09 am

16 Channel PWM Servo Driver

Post by ajpollme »

I am trying to use the PWM function on this to run a few SSRs connected to heating elements for an all electric home brewing set up. The tutorial states that the PWM frequency will go to as low as 1hz, but when I try to set the frequency that low with an led hooked up for testing it is still running quite a bit faster than 1hz more like 10 to 20 hz (I don't have an oscilloscope to check it but it is noticeably flickering). So can I really set this to 1hz or is there a typo in the tutorial?

User avatar
adafruit_support_bill
 
Posts: 88093
Joined: Sat Feb 07, 2009 10:11 am

Re: 16 Channel PWM Servo Driver

Post by adafruit_support_bill »

Hmmm. Looking at the chip specs, the upper limit in the documentation is almost certainly wrong. Not sure about the lower limit. I'll look into this...

User avatar
ktownsend
 
Posts: 1447
Joined: Thu Nov 05, 2009 2:18 am

Re: 16 Channel PWM Servo Driver

Post by ktownsend »

Sorry, this is a type in the tutorial. The actual range is 40-1000Hz based on a 25MHz internal clock. :(

ajpollme
 
Posts: 2
Joined: Wed Dec 26, 2012 9:09 am

Re: 16 Channel PWM Servo Driver

Post by ajpollme »

Thanks, I guess I will have to write code to run the slow PWM on the GPIO pins. I was just hoping to save myself some trouble and use a shortcut.

Locked
Please be positive and constructive with your questions and comments.

Return to “Other Products from Adafruit”