![]() ![]() Create shortcuts with predefined configs. Use the -c or -config command line argument while the app is open to switch config.Advanced tuning with steps, start %, stop %, response time and hysteresis.Mix fan curves or sensor togethers (max, min, average).Multiple fan curve functions, including a custom graph.Multiple temperature sources ( CPU, GPU, motherboard, hard drives.Change the theme and color of the application.1.JayzTwoCents - Everyone NEEDS this FREE piece of software. Polling-delay-passive = /* milliseconds */Ĥ-Wire Pulse Width Modulation (PWM) Controlled Fans Specification rev. On Type-C fan, it would stopped the fan while on Type-A fan it would run in minimal speed. If this value isn't defined, it defaults to 0 (stopped fan). Typically, this will be either 0 if it is OK for the fan to plain stop, or the same value as MINSTOP if you don't want the fan to ever stop. ![]() The PWM value to use when the temperature is below MINTEMP. The temperature over which the fan gets switched to maximum speed.įans (fan-j10 & fan-j17) runs in maximum speed if the CPU temperature above 80 degree C. The temperature below which the fan gets switched to minimum speed.įans (fan-j10 & fan-j17) runs in minimum speed if the CPU temperature below 40 degree C. The value does not affect Type-A fan.įollowing settings can be adjusted by user to tweak further. Type-C fan stopped at 24, added 5 for safety (in case of aging fan) give us 29. The minimum speed at which the fan still spins. Type-C fan restart at 15, added 5 for safety (in case of aging fan) give us 20. You should use a safe value to be sure it works, even when the fan gets old. Sets the minimum speed at which the fan begins spinning. Maps PWM outputs to temperature sensors so fancontrol knows which temperature sensors should be used for calculation of new values for the corresponding PWM outputs.įans ( fan-j10 & fan-j17) are controlled based on CPU thermal sensor ( thermal-cpu) reading. This variable defines at which interval in seconds the main loop of fancontrol will be executed. List of devices can be checked under /sys/class/hwmonįCTEMPS=/dev/fan-j10/pwm1=/dev/thermal-cpu/temp1_input /dev/fan-j17/pwm1=/dev/thermal-cpu/temp1_input Linux export the fan control mechanism to SYSFS under hwmon class. Helios4 uses 2 PWM under same bank therefore this patch needs to be applied to kernel source to remove the restriction. PWM value 0 represent 0% duty cycle and PWM value 255 represent 100% duty cycle.īelow graphs are bundled fan speed vs pwm value instead of duty cycle.Ĭurrently Linux gpio-mvebu driver does not allow more than 1 PWM under the same gpio bank. Linux use 8-bit integer to represent duty cycle. Helios4 has a Digital Temperature Sensor with 2‐wire Interface ( NCT75 Datasheet), located on bottom side of the board. The sensor reports the die temperature and is updated approximately once per second. Helios4's 10/100/1000 BASE-T PHY Tranceiver ( Marvell 88E1512 Datasheet) features an internal temperature sensor. It includes an on-die analog-to-digital thermal sensor, that is used to determine when the maximum specified processor junction temperature has been reached. Helios4 Temperature Sensors ¶ CPU Thermal Sensor ¶Īrmada 388 incorporates a Thermal Management engine for monitoring die temperature. Helios4 Fan Control Schematic ¶ Board Rev 1.1 ¶ģ.3V pull up fan ONLY! Early generation of 4-wire pwm fan may use 5V pull-upĭuty cycle data is converted from Linux PWM Fan Speed Comparison ¶ Here is a pictorial that illustrates these three scenarios: When a digital signal spends more time in the off state than the on state, it has a duty cycle of <50%. When a digital signal spends more time in the on state than the off state, it has a duty cycle of >50%. When a digital signal is on half of the time and off the other half of the time, the digital signal has a duty cycle of 50% and resembles a "square" wave. Duty cycle is expressed in percent, 100% being fully on. The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time a low duty cycle corresponds to low power, because the power is off for most of the time. PWM, or pulse width modulation is a technique which allows us to adjust the average value of the voltage that’s going to the electronic device by varying duty cycle of the power at a fast rate. Failed to do so could damage the controlling GPIO due to power surge. ![]() Fancontrol - automated software based fan speed controlĪlways POWER OFF the system before plug/unplug the fan. ![]()
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