openmv识别红绿灯并返回识别结果给arduino的python文件，并写一个相对应的arduino的接受程序

OpenMV识别红绿灯并返回识别结果给Arduino的Python文件：

import sensor
import image
import time
import pyb

# 初始化串口通信
uart = pyb.UART(3, 9600)
uart.init(9600, bits=8, parity=None, stop=1, timeout=1000, timeout_char=1000)

# 初始化摄像头
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False)
sensor.set_auto_whitebal(False)

# 初始化颜色追踪
red_threshold = (30, 100, 15, 127, 15, 127) #调试参数
green_threshold = (30, 100, -64, -8, -32, 32) #调试参数
color = "" # 红灯或绿灯

while(True):
    img = sensor.snapshot()
    blobs_red = img.find_blobs([red_threshold])
    blobs_green = img.find_blobs([green_threshold])
    if blobs_red:
        uart.write("red")
        color = "red"
    elif blobs_green:
        uart.write("green")
        color = "green"
    else:
        uart.write("unknown")
        color = "unknown"
    time.sleep(100) # 间隔100ms发送一次识别结果

相对应的Arduino接受程序：

String result = "";

void setup() {
  Serial.begin(9600);
}

void loop() {
  if (Serial.available() > 0) {
    result = Serial.readString();
    Serial.println(result);
  }
}