NodeMCU学习（五）--Timer

浅浅的花香味﹌ 2023-01-12 10:10 149阅读 0赞

## 1、认识timer相关的API ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p3Yl81NzgyMDkxNjA_size_16_color_FFFFFF_t_70][]

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## 2、案例代码 ##

### （1）tmr.alarm()应用 ###

if not tmr.create():alarm(5000, tmr.ALARM_SINGLE, function()
      print("hey there")
    end)
    then
      print("whoopsie")
    end

pin=4 -- 4就是D4,GPIO2
    flag=1
    
    timer1 = tmr.create()
    
    gpio.mode(pin, gpio.OUTPUT)
    gpio.write(pin, gpio.HIGH) 
    
    function run_led() 
        if flag == 1 then
            gpio.write(pin, gpio.LOW)
            flag = 0
        else
            gpio.write(pin, gpio.HIGH)  
            flag = 1
        end      
    end
    
    timer1:alarm(1000, tmr.ALARM_AUTO, run_led)

### （2）tmr.register()应用 ###

mytimer = tmr.create()
    mytimer:register(10000, tmr.ALARM_AUTO, function() print("hey there") end)
    mytimer:interval(3000) -- actually, 3 seconds is better!
    mytimer:start()

### （3）其他API ###

*  [`tobj:create()`][tobj_create]
 *  [`tobj:register()`][tobj_register]
 *  [`tobj:stop()`][tobj_stop]
 *  [`tobj:unregister()`][tobj_unregister]

## `3、注意事项` ##

`（1）API的具体应用一定要从官网上进行获取，API官网；`

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[tobj_create]: https://nodemcu.readthedocs.io/en/release/modules/tmr/#tobjcreate
[tobj_register]: https://nodemcu.readthedocs.io/en/release/modules/tmr/#tobjregister
[tobj_stop]: https://nodemcu.readthedocs.io/en/release/modules/tmr/#tobjstop
[tobj_unregister]: https://nodemcu.readthedocs.io/en/release/modules/tmr/#tobjunregister