HELLO FIRST POSTING

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Jaroslav
 
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HELLO FIRST POSTING

Post by Jaroslav »

Hallo Adafruits fans

I have Problem with Adafruit 815 board .
I need manage 8 pwm ventilators with different speed controlled by temperature sensor.
data I have from One wire temp sensor program working fine (on raspberry and with Go).
Signal on PWM pin working fine but ventilator(Arctic F8 PWM) working only with one speed .
Its possible manage this with Adafruit 815 or I making some failure with set-up ,program or connection.

Thanks for answer and possible help.
J A R O

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adafruit_support_bill
 
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Re: HELLO FIRST POSTING

Post by adafruit_support_bill »

Hi. I moved your post here from the Test Message forum.
ventilator(Arctic F8 PWM) working only with one speed
We are not familiar with this ventilator. If you can post some technical information about its control interface, we can try to answer your question.

Jaroslav
 
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Re: HELLO FIRST POSTING

Post by Jaroslav »

Sorry for multi posting.
Data for cooler ventilator:
80mm
850-2000 RPM / 31 CFM
22dBA
Fluid dynamic bearing
Thanks

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adafruit_support_bill
 
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Re: HELLO FIRST POSTING

Post by adafruit_support_bill »

Do you have a link to the data sheet? We need to know the electrical specifications for the control interface in order to determine if the PWM board is compatible. If you can post a photo of your setup and connections, that would be helpful as well.

Jaroslav
 
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Re: HELLO FIRST POSTING

Post by Jaroslav »

Installation manual for F8 pwm fan
http://www.overclocking.sk/sub/overcloc ... manual.pdf
J.

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adafruit_support_bill
 
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Re: HELLO FIRST POSTING

Post by adafruit_support_bill »

OK. Looks like a standard 4-wire CPU fan. How do you have it connected?

Jaroslav
 
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Re: HELLO FIRST POSTING

Post by Jaroslav »

Basic connection:
Black - gnd
red - 12v (power pin)
yellow - PWM pin
blue - no use

J.

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adafruit_support_bill
 
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Re: HELLO FIRST POSTING

Post by adafruit_support_bill »

The 4th pin (blue) is usually the control pin.
http://www.allpinouts.org/index.php/Mot ... _4_Pin_Fan

Jaroslav
 
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Re: HELLO FIRST POSTING

Post by Jaroslav »

I changed blue and yellow wire but effect is only reduction of speed and power (from 143mA to110 mA)
but no regulation of speed(PWM working from 0 to 100 %).

Jaroslav
 
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Re: HELLO FIRST POSTING

Post by Jaroslav »

I check :http://www.formfactors.org/developer/sp ... Public.pdf

//PWM Frequency: Target frequency 25 kHz,
acceptable operational range 21 kHz to 28 kHz //

On oscilloscope I haw 40,365 hz = 100%
and 112,88 hz = 0%

Maybe this is problem ?

Is possible adjust output pwm frequency ?
J.

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Re: HELLO FIRST POSTING

Post by adafruit_support_bill »

Yes. There is a function to set the PWM frequency: http://learn.adafruit.com/16-channel-pw ... -reference

Jaroslav
 
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Re: HELLO FIRST POSTING

Post by Jaroslav »

now I checked program but I have set maximum
----
onduty := ((4096 / 100) * v.LastPower) - 1 // max is 4095
if onduty < 0 {onduty = 0}
if onduty > 4094 {onduty = 4094}
offduty := 4095
log.Printf("Setting new Servo values %f - %f, %f ", v.LastPower, onduty, offduty)
v.setPWM(int(onduty), int(offduty))
---
//setPWMFreq should set output modulattion - probably something like check timer for on/off
func (s *Servo) setPWMFreq(freq float64) {
log.Printf("Setting output frequency %f for servo at channel %s ", freq, s.Channel)
prescale := 25000000.0 //this should be osc clock
prescale /= 4096.0 //12bit resolution
prescale /= float64(freq)
prescale -= 1.0
log.Printf("Estimated Prescale %f for servo at channel %s ", prescale, s.Channel)
prescale = math.Floor(prescale + 0.5)
log.Printf("Final Prescale %f for servo at channel %s ", prescale, s.Channel)

I check possibility to add 50 MHz external oscillator maybe this help .?????
J.

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adafruit_support_bill
 
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Re: HELLO FIRST POSTING

Post by adafruit_support_bill »

What processor are you using to control the PWM board?

Jaroslav
 
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Re: HELLO FIRST POSTING

Post by Jaroslav »

raspberry pi 2

Jaroslav
 
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Re: HELLO FIRST POSTING

Post by Jaroslav »

pearts set
pearts set
pwm con.gif (613.26 KiB) Viewed 764 times

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