## 将采集的数据传送到上位机

### UART测试
<code python>
from machine                import UART,Pin,Timer
from time                   import sleep_us

uart = UART(0, baudrate=115200, tx=Pin(0), rx=Pin(1), bits=8, parity=None, stop=1)
led = Pin(25, Pin.OUT)

tim = Timer()

print("Send UART.")

def tick(timer):
    global uart, led

    led.toggle()
    uart.write(b'\x55')

tim.init(freq=10, mode=Timer.PERIODIC, callback=tick)
</code>