D1 MINI 引脚图

https://wiki.wemos.cc/products:d1:d1_mini

D4 引脚

Lua文件：

LED = 4
gpio.mode(LED,gpio.OUTPUT)
gpio.write(LED,gpio.HIGH)
COUNTER = 0
tmr.alarm(0,1000,1,function( )
if COUNTER % 2 == 0 then
COUNTER= COUNTER + 1
gpio.write(LED,gpio.HIGH)
else
COUNTER= COUNTER + 1
gpio.write(LED,gpio.LOW)
end
end
)