通过2路红外发射，顺序接收，检测收发功能是；用手遮挡对应的发射管，用共阳数码管的a、d端模拟；每60ms分别检测2路发射，通过每组发射10个脉；-By 2-way infrared emission, in the order received, the transceiver function is detected hand block corresponding to emission control, with a total of Yang digital tube a, d-end