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| Active Cooling 5v brushless fan with Motor Speed Controller soft PWM |
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Posted by: MarkHaysHarris777 - 07-25-2016, 06:47 AM - Forum: Pi2, Euler and Exp GPIO Ports
- Replies (14)
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The fan above is a 5v brushless 140ma fan (free standing on rubber fan mounts) capable of moving 5cfpm ; being driven by a python software PWM motor speed control driver using a PN2222 transistor to handle the current. The GPIO pin signals the transistor via 1k ohm resistor. The codes rely on the RPi.GPIO-PineA64 module from github.
I will be uploading the python codes near the bottom of this post.
The following two pics are close-in shots of the fan, and the transistor current driver:
The PN2222 transistor above can also be replaced by the 2N2222; although, the emitter collector pins are swapped-- the emitter goes to ground.
The fans ship from Jin LI , and as such take three to six weeks to ship to the U.S. Its the shipping, not Jin LI's fault. These little fans move a lot of air; however, they are also noisy. The speed control circuit quiets the fans considerably to a slight whisper, still moves the air more efficiently, and may be controlled off, or controlled by signal based on SoC temperature.
fan_motor.sh
Code: #!/usr/bin/python
#
# fan_motor.sh
#*****************************************************************
# author: Mark H. Harris
# license: GPLv3
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MECHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENCIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#*****************************************************************
## Import the necessary header modules
from time import sleep
import signal as SIGNAL
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
## SOFTWARE PWM GPIO23 pin(16)
soft_pwm = 23
GPIO.setup(soft_pwm, GPIO.OUT)
ms_on = .016
ms_off = .004
hup_flag = False
## FUNCTION DEFINITIONS
def motor_duty_on(m_pin, t_delay):
GPIO.output(m_pin, True)
sleep(t_delay)
def motor_duty_off(m_pin, t_delay):
GPIO.output(m_pin, False)
sleep(t_delay)
def end():
GPIO.cleanup()
quit()
def ssighup(signum, frame):
global hup_flag
global ms_on
global ms_off
if (hup_flag):
ms_on = .016
hup_flag=False
else:
ms_on = .250
hup_flag=True
print(" ")
print("HUP: duty_cycle toggled value: "+str(ms_on))
SIGNAL.signal(SIGNAL.SIGHUP, ssighup)
kb_interrupt = False
while(not kb_interrupt):
try:
motor_duty_on(soft_pwm, ms_on)
motor_duty_off(soft_pwm, ms_off)
except KeyboardInterrupt:
kb_interrupt = True
print(" ")
print("motor controller ended by interrupt, bye!")
end()
The code may be signaled with a -SIGHUP which when received by the speed controller code will toggle the duty cycle of the soft PWM. from 80% to 100%. A second HUP will toggle the duty cycle back to 80%, or slow speed.
There will be a follow-on post with some more pics, as well a simple schematic.
edit: I changed the default soft-pwm pin to GPIO23, pin(16).
marcushh777
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| GbE: Optionally force master mode for RTL PHY |
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Posted by: xalius - 07-25-2016, 06:04 AM - Forum: Linux on Pine A64(+)
- Replies (1)
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A while back I stumbled over this patch for u-boot https://patchwork.ozlabs.org/patch/602067/ forcing the RTL80211C/E PHY into master mode to overcome some issues when the PHY is in slave mode.
Maybe this could be a source for the random GbE problems we see here sometimes?
I was just looking at Olimex blog and read the specs for their A64 board, and one of the features reads:
Code: ...
* Ethernet Gigabit interface works just in master mode
...
I tried adding the register read-modify-write to the 3.10.x BSP driver but failed, maybe someone with better skills can have a look at it? The patch boils down to:
Code: /* RTL8211x 1000BASE-T Control Register */
#define MIIM_RTL8211x_CTRL1000T_MSCE (1 << 12);
#define MIIM_RTL8211X_CTRL1000T_MASTER (1 << 11);
...
unsigned int reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_CTRL1000);
/* force manual master/slave configuration */
reg |= MIIM_RTL8211x_CTRL1000T_MSCE;
/* force master mode */
reg |= MIIM_RTL8211X_CTRL1000T_MASTER;
phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000, reg);
...
One read-modify-write operation....
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Pine64 1GB Auto POwer Off |
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Posted by: Mohit B - 07-25-2016, 03:08 AM - Forum: Getting Started
- Replies (1)
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Hi,
I have downloaded the Phoenix Card image of the rooted android on 8 GB card. First boot was OK. I configured my WiFi, tested Bluetooth. I installed YouTube.
As soon as I fired up the YouTube app my screen went black. I rebooted by powering off and then on. While booting it said optimizing android.
Now every-time after 10 seconds of boot the board powers off automatically.
What should I do.
Regards,
MB
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| When & How to use resize_rootfs.sh? |
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Posted by: jesse1234 - 07-25-2016, 01:25 AM - Forum: Getting Started
- Replies (5)
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Quote:- Execute resize_rootfs.sh script to resize the root partition in order to fully utilize the SD Card
Well I have the Debian Jessie OS up and running but I am using a 32GB SD card that only sees according to the Disk Usage Analyzer only 7.5 GB.
I tried using the terminal to execute the script but I am not sure where in the file system it is located!?
When & How to use resize_rootfs.sh?
Jesse 
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| miss a lot of parts of my backer order |
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Posted by: visigalmarco - 07-24-2016, 11:36 PM - Forum: Shipment Related Discussion
- Replies (3)
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Good morning, this afternoon I receved a very little part of my items in particular:
2- 4 Way 12C Cable;
2- 5 Way to 4-Way I2C Cable;
2- 5 Way 12C Cable;
2- PA642GB;
1- PMSD001;
1- PINE64 Basic Media IR Remote Control;
1- POWER SUPPLY;
1- P64-ALUMENIUM ENCLOSURE.
they are missing:
1- 64GB MicroSD Android
1- 7" LCD Touch Screen
1- 802.11BGN Wifi/ BT4.0 Module
1- PlayBox Kit
1- HDMI to DVI Adapter
1- HDMI to VGA Adapter With Audio
2- 4K HDMI Cable - 3FT
2- 7" LCD Touch Screen Panel
1- Wifi 802.11BGN/ Bluetooth 4.0 Module
2- PINE64 PlayBox Enclosure
2- PINE64 Acrylic Open Enclosure
2- PoE Splitter comply to 802.3af standard
1- PINE64 Z-Wave Module (EU version)
1- PINE A64+ 2GB - PA642GBWIFI
1- 64GB MicroSD Card - 64GBLIN
1- PINE64 Basic Media IR Remote Control
2- 5MP Camera Module
Can you say me when send the rest of my items?
My Backer number is 21,219
best regards
Marco Visigalli
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| What will it take to get the Ethernet port working? |
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Posted by: clarkss12 - 07-24-2016, 06:58 PM - Forum: Ethernet Port
- Replies (10)
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As everyone knows, the gigabit Ethernet port does not work on the 2gig boards running Android and Remix OS. I have the WiFi card, that came with my pledge, installed, and it is OK for browsing the internet but not for a serious media player device.
Who is in charge of getting this to work?? Is there anyone steering the ship?
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