2020-03-16 13:11:25 +07:00
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## PWM Introduction
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2020-03-12 01:37:39 +07:00
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Please kindly review the [pwm pages](/helios4/pwm) from the Helios4 device.
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2020-03-16 13:11:25 +07:00
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Basically the PWM mechanism of Helios64 board is same with Helios4.
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2020-03-12 01:37:39 +07:00
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2020-03-16 13:11:25 +07:00
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## Fan Control Schematic
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2020-03-12 01:37:39 +07:00
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2020-03-16 13:11:25 +07:00
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**Remarks**
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| Description | Header P7 | Header P6 | Remarks |
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|-----------|---------|-----------|---------|
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| PWM pin | PWM0 | PWM1 | 5V tolerant |
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| SENSE pin | GPIO4_C5 | GPIO4_C7 | no kernel module/userspace apps that make use of this pin yet |
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| PWM Frequency | 25 kHz | 25 kHz | defined in device tree |
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## Fan Specification in Helios64
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2020-03-12 01:37:39 +07:00
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Coming Soon.
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2020-03-16 13:11:25 +07:00
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## Use Case in Linux
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2020-03-12 01:37:39 +07:00
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Coming Soon.
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!!! Notes
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RPM readings in the PWM fans is not available in Helios64 board.
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