pwm - PWM Module

Adapted Air780E/Air700E Air780EP Air601 Air101/Air103 Air105 ESP32C3 ESP32S3

Note

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Tip

This library has its own demo,click this link to view the demo example of pwm

pwm.open(channel, period, pulse, pnum, precision)

Turn on the specified PWM channel

Parameters

Incoming Value Type	Explanation
int	PWM Channel
int	Frequency, 1-1000000hz
int	Duty cycle 0-frequency division accuracy
int	Output cycle 0 for continuous output, 1 for single output, the other for the specified number of pulses output
int	Frequency division accuracy, 100/256/1000, default is 100. If the device does not support it, there will be a log prompt.

Return Value

return value type	explanation
boolean	Processing results, return true on success, return on failure false

Examples

-- Turn on PWM5, frequency 1kHz, duty cycle 50%
pwm.open(5, 1000, 50)
-- Turn on PWM5, frequency 10kHz, divided 31/256
pwm.open(5, 10000, 31, 0, 256)

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pwm.close(channel)

Turn off the specified PWM channel

Parameters

Incoming Value Type	Explanation
int	PWM Channel

Return Value

return value type	explanation
nil	No processing result

Examples

-- Close PWM5
pwm.close(5)

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pwm.capture(channel)

PWM Capture

Parameters

Incoming Value Type	Explanation
int	PWM Channel
int	Capture Frequency

Return Value

return value type	explanation
boolean	Processing results, return true on success, return on failure false

Examples

-- PWM0 Capture
while 1 do
    pwm.capture(0,1000)
    local ret,channel,pulse,pwmH,pwmL  = sys.waitUntil("PWM_CAPTURE", 2000)
    if ret then
        log.info("PWM_CAPTURE","channel"..channel,"pulse"..pulse,"pwmH"..pwmH,"pwmL"..pwmL)
    end
end

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