pwm - PWM Module#

Adapted Air780E Air780EP Air780EPS Air700EAQ Air700EMQ Air700ECQ Air201

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)

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)

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