AI-64 Fan Header - Compatible male connector

General Discussion
#1

Hi Guys,

What male connector is needed for the fan header, I have had a good search around and just can not work it out!

Many thanks for any help

Andy

Heat Dissipation AI-64
#2

The BOM mentions SINOTOP and it looks like one these SINIOTOP still trying to locate a mating connector. The connector only seems to show up, when viewing the Chinese pages.

It looks like a Molex PicoBlade connector

#3

Thanks Benedict.

I’m, wondering if its the UART ports are the same as well, they look similar (but different) :slight_smile:

#4

UART ports are JST ZH connectors 1.5mm pitch.

I am waiting for a crimp tool to try and crimp both connectors, having bought the various parts from RS components in the UK. I have a feeling it will be easier to try and get some ready crimped cable though as the crimps are tiny

#5

Thanks, I got some cables JST ZH cables for the UARTS, I thought the fan one was the same pitch, it isn’t.

I rigged a fan up myself through the headers and PWM.

I’m not actually sure the fan stuff through the fan port is actually even setup, so it might require some tinkering!

#6

I think we need this connector for Fan https://www.molex.com/molex/products/part-detail/cable_assemblies/0151340406

Fan with 4-pin molex picoblade connector is shown in this thread

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#7

I just ordered one, I will let you know if it fits…

#8

Fits perfectly.

#9

Ok there doesn’t seem to be much on the system using the fan header.

To at least just use the PWM add the following to the dts file and build/install it:

BONE_PIN(FAN_PWM,  default,	J721E_IOPAD(0x190, PIN_OUTPUT, 6)) /* (W23) RGMII6_TD3.GPIO0_99 */
BONE_PIN(FAN_TACH, default, J721E_IOPAD(0x194, PIN_INPUT_PULLUP, 7)) /* (W28) RGMII6_TD2.GPIO0_100 */

There seems to be some strangeness going on with the PWM, unless I setup both channels on pwmchip0 and pwmchip6 then pwmchip6 bugs out and doesn’t take the duty_cycle correctly.

so I need

#!/bin/bash
cd /sys/class/pwm/pwmchip0
echo 1 > export
cd pwm1
echo 1000 > period
echo 350 > duty_cycle 
echo 1 > enable 
cd /sys/class/pwm/pwmchip0
echo 0 > export
cd pwm0
echo 1000 > period
echo 350 > duty_cycle 
echo 1 > enable 

cd /sys/class/pwm/pwmchip6
echo 1 > export
cd pwm1
echo 1000 > period
echo 350 > duty_cycle
echo 1 > enable
cd /sys/class/pwm/pwmchip6
echo 0 > export
cd pwm0
echo 1000 > period
echo 350 > duty_cycle
echo 1 > enable

To get it working correctly, then after this setting the duty cycle works:

echo 750 > /sys/class/pwm/pwmchip6/pwm1/duty_cycle
3 Likes
#10

Finally got around to trying a fan on my board. I have a 40mm x 10mm Noctua
Runing 50% duty cycle keeps the temperature to around 40C.

I agree there does seem to be something weird with the PWMs.

Incidentally your period values are too high. You need 40000 to get a 25Khz pwm signal.

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