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opi5-fan-control's Issues

undefined reference to `crypt' undefined reference to `pow' 

orangepi@orangepi5:~/opi5-fan-control$ gcc -o fan-control fan-control.c -lwiringPi
/usr/bin/ld: /usr/lib/gcc/aarch64-linux-gnu/11/../../../../lib/libwiringPi.so: undefined reference to `crypt'
/usr/bin/ld: /usr/lib/gcc/aarch64-linux-gnu/11/../../../../lib/libwiringPi.so: undefined reference to `pow'
collect2: error: ld returned 1 exit status

I cloned the v0.2 version and seemed to install ok

orangepi@orangepi5:~/opi5-fan-control$ gpio readall
 +------+-----+----------+--------+---+   OPI5   +---+--------+----------+-----+------+
 | GPIO | wPi |   Name   |  Mode  | V | Physical | V |  Mode  | Name     | wPi | GPIO |
 +------+-----+----------+--------+---+----++----+---+--------+----------+-----+------+
 |      |     |     3.3V |        |   |  1 || 2  |   |        | 5V       |     |      |
 |   47 |   0 |    SDA.5 |     IN | 1 |  3 || 4  |   |        | 5V       |     |      |
 |   46 |   1 |    SCL.5 |     IN | 1 |  5 || 6  |   |        | GND      |     |      |
 |   54 |   2 |    PWM15 |     IN | 1 |  7 || 8  | 0 | IN     | RXD.0    | 3   | 131  |
 |      |     |      GND |        |   |  9 || 10 | 0 | IN     | TXD.0    | 4   | 132  |
 |  138 |   5 |  CAN1_RX |     IN | 1 | 11 || 12 | 1 | IN     | CAN2_TX  | 6   | 29   |
 |  139 |   7 |  CAN1_TX |     IN | 1 | 13 || 14 |   |        | GND      |     |      |
 |   28 |   8 |  CAN2_RX |     IN | 1 | 15 || 16 | 1 | IN     | SDA.1    | 9   | 59   |
 |      |     |     3.3V |        |   | 17 || 18 | 1 | IN     | SCL.1    | 10  | 58   |
 |   49 |  11 | SPI4_TXD |     IN | 1 | 19 || 20 |   |        | GND      |     |      |
 |   48 |  12 | SPI4_RXD |     IN | 1 | 21 || 22 | 1 | IN     | GPIO2_D4 | 13  | 92   |
 |   50 |  14 | SPI4_CLK |     IN | 1 | 23 || 24 | 1 | IN     | SPI4_CS1 | 15  | 52   |
 |      |     |      GND |        |   | 25 || 26 | 1 | IN     | PWM1     | 16  | 35   |
 +------+-----+----------+--------+---+----++----+---+--------+----------+-----+------+
 | GPIO | wPi |   Name   |  Mode  | V | Physical | V |  Mode  | Name     | wPi | GPIO |
 +------+-----+----------+--------+---+   OPI5   +---+--------+----------+-----+------+

Any idea on what the errors are as all new to me.

After a Google I tried gcc -o fan-control fan-control.c -lwiringPi -lcrypt -lm and worked

Add another varaible for below min temp PWM

In current state when temperature is above but close to MIN_TEMP and MIN_PWM is 0 fun is making noise as PWM value there would be too low for it to spin stable. I would suggest to add another macro, lets say PWM_BELOW_TEMP (default to 0) and set PWM to that value when temperature is below MIN_TEMP. This allow to set MIN_PWM to higher values, lets say 30% - which makes fan not to rotate when temperature below MIN_TYEMP but then instantly start with 30% and to avoid making noise and not to start.

unable to run fan-control in crontab

Hi, I have followed the instructions provided to install and run fan-control on an orangepi5. I'm very new in this domain and struggle to get crontab to run the program on startup/reboot.

To troubleshoot I then tried to run the program directly using
./fan-control
in the directory it was installed: /wiringOP/opi5-fan-control

I then get the following error:

orangepi@orangepi5:~/wiringOP/opi5-fan-control$ ./fan-control
wiringPiSetup: Unable to open /dev/mem or /dev/gpiomem: No such file or directory.
  Aborting your program because if it can not access the GPIO
  hardware then it most certianly won't work
  Try running with sudo?

Running the same command with sudo worked after giving the device password.

lastly here is my crontab command if ever I made a mistake on it:

@reboot /wiringOP/opi5-fan-control/fan-control

What I understand so far is that I need to run crontab with the "sudo" permission. But there is no mention of this in your instructions. Have I overlocked a crucial step ? How can I set things up so ./fan-control doesn't need "permissions" ?

Thank you !

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