Richard Menedetter wrote to Bbsing.Bbs <=-
Hi Bbsing!
01 Aug 2019 17:01, from Bbsing.Bbs -> Richard Menedetter:
I had a small fan. but I just bought a "Ultimate Pi cooling fan"
for 8 USD. (simply a large heatsink with 2 cooling fans).
Probably not needed but I liked its appearance, and it may stop
throttling of the pi.
Is your colling fan attached to pins where you controll when the fan
turns on?
No ... same as you, fan is allways on.
CU, Ricsi
Ok I'll come up with a solution for this.
I think a here are some parts required for minimal required build:
1) 1 560 ohm resistor
2) 1 NPN 3904 transistor
4) some wires
.) a diagram
.) some code see below
.) possibly a diode.
I did some messing around and found a fix for this annoying fan that is always on. .. mine is rattling a bit and if I can just turn it on when the cpu/gpu get hot, I can prevent a lot of noise.
The basics of the hookup:
[raspi pin 12]-(gpio18 3v)---(560 ohm resistor)---(npn3904 base)
[raspi pin 6]-(ground)---[emitter (npn3904)]
[collector (npn3904)]-(5v)---(-){fan motor black lead}
{fan motor red wire}----[raspi pin 2]-(+5v)
The gpio readall output helps with orientation
-- CPU SIDE --
+---Pi 3B+-+---+------+---------+-----+-----+
| Physical | V | Mode | Name | wPi | BCM |
| +----++----+---+------+---------+-----+-----+
| | 1 || 2 | | | 5v | | |
| 3 || 4 | | | 5v | | |
H | 5 || 6 | | | 0v | | |
D | 7 || 8 | 0 | IN | TxD | 15 | 14 |
M | 9 || 10 | 1 | IN | RxD | 16 | 15 |
I | 11 || 12 | 1 | OUT | GPIO. 1 | 1 | 18 |
| 13 || 14 | | | 0v | | |
P | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
O | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
R | 19 || 20 | | | 0v | | |
T | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
| 23 || 24 | 1 | IN | CE0 | 10 | 8 |
| | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
| | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 29 || 30 | | | 0v | | |
| 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
| 33 || 34 | | | 0v | | |
| 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
| 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
| 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
+----++----+---+------+---------+-----+-----+
| Physical | V | Mode | Name | wPi | BCM |
+---Pi 3B+-+---+------+---------+-----+-----+
-- USB ETHERNET SIDE --
I used Edoardo Paoloa Scalafiotti's code with minor modifications
basic code begin -- base64 begin --
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-- base64 end --
run the code above using sudo:
sudo ./raspi.fan.control.basic.py
I tested this with the above parts and code.
My system usually runs about 49 deg celcius.
I test this with stres via:
stress -v -c 4 -t 900s
to install stress type the following:
sudo apt update && sudo apt install stress
If you want a systemd script for this let me know. Thats probably best if you just want the entire thing to run at startup.
NOTE: I found if I don't slow down the execution loop that will drive the cpu use up and increase cpu temp. I also added a sleep gate to allow the system to cool below the threshold I set to keep the npn3904 from micro triggers.
If anyone sees and issue with the wiring setup let me know.
... BBSING
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