Electronic variable vane control
Electronic variable vane control
09-04-2009, 03:21 PM
#69
(09-04-2009, 01:33 PM)Tymbrymi(09-04-2009, 08:27 AM)winmutt I have some prototype code for the arduino. I spent a few hours last night researching and there is more I need to understand about the different types of PWM. The arduino is capable of the following frequencies :
If I'm reading the datasheet properly, those are the max frequencies when using those specific clock sources. Look at page 120 of the datasheet, and use "Fast PWM mode". You'll use the 16Mhz clock frequency divided by 8 as the clock source to the timer (TCCR1B = xxxxx010). This determines the frequency of the "ticks" (500ns). Since it is a 16-bit counter, you can have up to 65,535 ticks in the period. 7.1ms / 500ns = 14,200 ticks, which will give you the 140Hz frequency. Use the fast PWM mode where you put "top" in ICR1 (WGM13:0 = 14), and load the 14,200 into ICR1. In order to change the duty cycle you will load a number into OCR1x between 0 and 14,200. The percentage of 14,200 you enter will be the duty factor.
Did that make any sense? The datasheet is still pretty confusing to me...
The part I wasn't clear on was if it was possible to adjust the duty cycle at 140hz. From what I read 140hz could be obtained by picking the near lowest starting freq and then adjusting the duty cycle to hit the frequency, it just wasnt clear if you could adjust the duty cycle then. I will go back and reread, I may have been confusing one of interrupts variables with the one that controls duty cycle. In fact that may very well be it as analogWrite controls with cycle. I was a few beers into a festive mood
. I looked for scopes on CL, nothing cheap.....
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
(09-04-2009, 01:33 PM)Tymbrymi(09-04-2009, 08:27 AM)winmutt I have some prototype code for the arduino. I spent a few hours last night researching and there is more I need to understand about the different types of PWM. The arduino is capable of the following frequencies :
If I'm reading the datasheet properly, those are the max frequencies when using those specific clock sources. Look at page 120 of the datasheet, and use "Fast PWM mode". You'll use the 16Mhz clock frequency divided by 8 as the clock source to the timer (TCCR1B = xxxxx010). This determines the frequency of the "ticks" (500ns). Since it is a 16-bit counter, you can have up to 65,535 ticks in the period. 7.1ms / 500ns = 14,200 ticks, which will give you the 140Hz frequency. Use the fast PWM mode where you put "top" in ICR1 (WGM13:0 = 14), and load the 14,200 into ICR1. In order to change the duty cycle you will load a number into OCR1x between 0 and 14,200. The percentage of 14,200 you enter will be the duty factor.
Did that make any sense? The datasheet is still pretty confusing to me...
The part I wasn't clear on was if it was possible to adjust the duty cycle at 140hz. From what I read 140hz could be obtained by picking the near lowest starting freq and then adjusting the duty cycle to hit the frequency, it just wasnt clear if you could adjust the duty cycle then. I will go back and reread, I may have been confusing one of interrupts variables with the one that controls duty cycle. In fact that may very well be it as analogWrite controls with cycle. I was a few beers into a festive mood
. I looked for scopes on CL, nothing cheap.....
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
Messages In This Thread
Electronic variable vane control - by winmutt - 01-08-2009, 05:47 PM
RE: Electronic doodads - by winmutt - 01-08-2009, 06:13 PM
RE: Electronic doodads - by Gross Polluter - 01-09-2009, 02:22 AM
RE: Electronic doodads - by ForcedInduction - 01-09-2009, 04:03 AM
RE: Electronic doodads - by winmutt - 01-09-2009, 08:10 AM
RE: Electronic doodads - by winmutt - 01-09-2009, 09:11 AM
RE: Electronic doodads - by Gross Polluter - 01-09-2009, 09:41 AM
RE: Electronic doodads - by GREASY_BEAST - 01-09-2009, 10:54 AM
RE: Electronic doodads - by winmutt - 01-09-2009, 11:05 AM
RE: Electronic doodads - by GREASY_BEAST - 01-09-2009, 01:10 PM
RE: Electronic doodads - by winmutt - 01-09-2009, 02:55 PM
RE: Electronic doodads - by oel_brenner - 01-10-2009, 01:02 PM
RE: Electronic doodads - by GREASY_BEAST - 01-11-2009, 12:45 PM
RE: Electronic doodads - by tantank79 - 01-12-2009, 01:21 AM
RE: Electronic doodads - by Telecommbrkr - 01-11-2009, 10:37 PM
RE: Electronic doodads - by winmutt - 01-12-2009, 10:20 AM
RE: Electronic doodads - by ForcedInduction - 01-12-2009, 02:01 AM
RE: Electronic doodads - by oel_brenner - 01-12-2009, 07:56 PM
RE: Electronic doodads - by winmutt - 01-12-2009, 08:49 PM
RE: Electronic doodads - by oel_brenner - 01-12-2009, 09:03 PM
RE: Electronic doodads - by winmutt - 01-12-2009, 09:40 PM
RE: Electronic doodads - by GREASY_BEAST - 01-14-2009, 03:05 PM
RE: Electronic doodads - by oel_brenner - 01-14-2009, 11:41 PM
RE: Electronic doodads - by Gross Polluter - 01-15-2009, 01:57 AM
RE: Electronic doodads - by Tymbrymi - 01-30-2009, 01:54 PM
RE: Electronic doodads - by winmutt - 01-14-2009, 05:21 PM
RE: Electronic doodads - by winmutt - 01-15-2009, 10:06 AM
RE: Electronic doodads - by winmutt - 01-20-2009, 10:29 PM
RE: Electronic doodads - by winmutt - 01-20-2009, 11:16 PM
RE: Electronic doodads - by winmutt - 01-21-2009, 02:55 PM
RE: Electronic doodads - by cannonballSDL - 01-25-2009, 04:02 AM
RE: Electronic doodads - by winmutt - 01-26-2009, 10:37 AM
RE: Electronic doodads - by winmutt - 01-30-2009, 02:08 PM
RE: Electronic doodads - by Tymbrymi - 01-30-2009, 02:47 PM
RE: Electronic doodads - by ForcedInduction - 03-17-2009, 07:25 PM
RE: Electronic doodads - by Tymbrymi - 03-18-2009, 07:51 AM
RE: Electronic doodads - by ForcedInduction - 03-18-2009, 07:59 AM
RE: Electronic doodads - by GREASY_BEAST - 03-18-2009, 09:13 AM
RE: Electronic doodads - by Tymbrymi - 03-19-2009, 08:36 AM
RE: Electronic doodads - by GREASY_BEAST - 03-19-2009, 11:45 AM
RE: Electronic doodads - by GREASY_BEAST - 03-21-2009, 09:54 AM
RE: Electronic doodads - by Tymbrymi - 03-23-2009, 07:40 AM
RE: Electronic doodads - by GREASY_BEAST - 03-23-2009, 10:41 AM
RE: Electronic doodads - by winmutt - 03-17-2009, 07:41 PM
RE: Electronic doodads - by ForcedInduction - 03-17-2009, 07:44 PM
RE: Electronic doodads - by winmutt - 03-17-2009, 07:47 PM
RE: Electronic doodads - by winmutt - 03-18-2009, 03:02 PM
RE: Electronic doodads - by 300SD81 - 03-23-2009, 10:10 AM
RE: Electronic doodads - by Tymbrymi - 03-25-2009, 08:17 AM
RE: Electronic doodads - by 300SD81 - 03-23-2009, 06:45 PM
RE: Electronic doodads - by winmutt - 03-24-2009, 10:08 AM
RE: Electronic doodads - by Gross Polluter - 03-24-2009, 02:54 PM
RE: Electronic doodads - by winmutt - 09-04-2009, 10:31 AM
RE: Electronic doodads - by 300SD81 - 03-29-2009, 11:53 AM
RE: Electronic doodads - by 300SD81 - 04-09-2009, 10:23 AM
RE: Electronic doodads - by oel_brenner - 04-20-2009, 10:54 PM
RE: Electronic doodads - by 300SD81 - 04-20-2009, 11:40 PM
RE: Electronic doodads - by ForcedInduction - 04-21-2009, 05:45 PM
RE: Electronic doodads - by oel_brenner - 04-21-2009, 10:06 PM
RE: Electronic doodads - by oel_brenner - 04-29-2009, 10:41 PM
RE: Electronic doodads - by oel_brenner - 04-30-2009, 10:48 PM
RE: Electronic doodads - by Gross Polluter - 06-05-2009, 03:55 PM
RE: Electronic doodads - by winmutt - 09-03-2009, 01:27 PM
RE: Electronic doodads - by Tymbrymi - 09-03-2009, 01:36 PM
RE: Electronic doodads - by winmutt - 09-03-2009, 02:25 PM
RE: Electronic doodads - by tomnik - 09-04-2009, 06:15 AM
RE: Electronic variable vane control - by winmutt - 09-04-2009, 08:27 AM
RE: Electronic variable vane control - by Tymbrymi - 09-04-2009, 01:33 PM
RE: Electronic variable vane control - by winmutt - 09-04-2009, 03:21 PM
RE: Electronic variable vane control - by winmutt - 01-22-2011, 10:21 PM
RE: Electronic variable vane control - by aaa - 01-22-2011, 10:53 PM
RE: Electronic variable vane control - by winmutt - 01-22-2011, 11:38 PM
RE: Electronic variable vane control - by Spaceraver - 01-23-2011, 12:08 PM
RE: Electronic variable vane control - by winmutt - 01-23-2011, 03:55 PM
RE: Electronic variable vane control - by winmutt - 01-24-2011, 09:25 AM
RE: Electronic variable vane control - by aaa - 01-24-2011, 05:04 PM
RE: Electronic variable vane control - by Spaceraver - 01-25-2011, 04:53 AM
RE: Electronic variable vane control - by winmutt - 01-25-2011, 09:40 AM
RE: Electronic variable vane control - by 300D50 - 01-25-2011, 12:01 PM
RE: Electronic variable vane control - by winmutt - 01-25-2011, 05:45 PM
RE: Electronic variable vane control - by MTUPower - 01-25-2011, 07:15 PM
RE: Electronic variable vane control - by aaa - 01-25-2011, 07:21 PM
RE: Electronic variable vane control - by winmutt - 01-26-2011, 06:28 PM
RE: Electronic variable vane control - by tomnik - 01-27-2011, 12:45 AM
RE: Electronic variable vane control - by Syncro_G - 01-27-2011, 10:17 AM
RE: Electronic variable vane control - by 300D50 - 01-27-2011, 10:43 AM
RE: Electronic variable vane control - by aaa - 02-01-2011, 08:01 PM
RE: Electronic variable vane control - by winmutt - 03-04-2011, 09:38 PM
RE: Electronic variable vane control - by 300D50 - 03-04-2011, 11:45 PM
RE: Electronic variable vane control - by winmutt - 03-07-2011, 10:14 AM
RE: Electronic variable vane control - by 300D50 - 03-07-2011, 02:46 PM
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