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用 Micropython 驱动 DFRobot C4002 毫米波雷达

  • 2026-06-27 18:50:31
用 Micropython 驱动 DFRobot C4002 毫米波雷达

上一篇《ESP32+C4002 毫米波雷达智能家居实测:人体存在感应声光控制》基于ESPHOME测试C4002毫米波雷达在智能家居的应用。本次尝试使用 Micropython 进行开发。官方提供了 Python 驱动,暂无原生 Micropython 驱动,但二者语法相近,移植难度不大。

1、硬件介绍

C4002 是 DFRobot 推出的 24GHz 毫米波人体存在传感器模块。模块突破了传统PIR传感器只能检测大幅运动的局限,可在10x10m的有效检测范围内,同步侦测运动人体与静止/微动人体,并支持运动速度检测、运动方向识别(靠近/远离)及环境光检测功能。

  • 工作频率为 24GHz~24.25GHz

  • 检测距离:运动最远 11 米、微动 / 静止最远 10 米,支持参数配置

  • 可检测人体运动、静止存在状态,同时识别运动方向与运动速度

  • 探测角度:120°×120°

  • 采用 UART 通信接口,波特率 115200bps

  • 模块内置光照传感器,检测范围 0~50lux

  • 整体尺寸为 22mm × 26mm

2、驱动

目前官方仅提供 C/C++、Python 版本驱动,未适配 Micropython。我借助 AI 工具,将 Python 驱动进行移植改造,成功适配出可用的 Micropython 驱动。

驱动详见附件。

3、快速上手

以 ESP32-C3 为例,硬件接线如下:

C4002ESP32说明
VCC5V电源
GNDGND地线
TXGPIO0串口接收
RXGPIO1串口发送

注意: 一定要接 5V,3.3V 供电可能不稳定。

附上简易测试示例代码:

# -*- coding: utf-8 -*-"""DFRobot C4002 Micropython 示例"""import timeimport machinefrom DFRobot_C4002 import DFRobot_C4002, PresenceTarget, MotionTarget# 初始化 UART,使用 GP0(TX) 和 GP1(RX)# 默认波特率: 115200c4002 = DFRobot_C4002(uart_num=1, baud=115200, tx=0, rx=1)# 初始化 GPIO2 作为雷达输出引脚的输入端radar_output_pin = machine.Pin(2, machine.Pin.IN, machine.Pin.PULL_DOWN)c4002.set_out_pin_mode(c4002.OUT_PIN_MODE1) def setup():    """初始化传感器"""    while c4002.begin() != True:        print("C4002 初始化失败!")        time.sleep_ms(500)    print("C4002 初始化成功!")    time.sleep_ms(50)    # 关闭指示灯    if c4002.set_run_led_state(c4002.LED_OFF):        print("设置运行指示灯成功!")    else:        print("设置运行指示灯失败!")    if c4002.set_out_led_state(c4002.LED_OFF):        print("设置输出指示灯成功!")    else:        print("设置输出指示灯失败!")    # 设置分辨率模式(80cm 分辨率,支持 15 个距离门限)    if c4002.set_resolution_mode(c4002.RESOLUTION_80CM):        print("设置分辨率模式成功!")    else:        print("设置分辨率模式失败!")    # 设置检测范围 0-1100cm    if c4002.set_detect_range(01100):        print("设置检测范围成功!")    else:        print("设置检测范围失败!")    # 设置光照阈值(0 = 无论光照条件如何始终检测)    if c4002.set_light_thresh(0):        print("设置光照阈值成功!")    else:        print("设置光照阈值失败!")    # 启用所有距离门限    gate_state = [        c4002.C4002_ENABLE, c4002.C4002_ENABLE, c4002.C4002_ENABLE,        c4002.C4002_ENABLE, c4002.C4002_ENABLE, c4002.C4002_ENABLE,        c4002.C4002_ENABLE, c4002.C4002_ENABLE, c4002.C4002_ENABLE,        c4002.C4002_ENABLE, c4002.C4002_ENABLE, c4002.C4002_ENABLE,        c4002.C4002_ENABLE, c4002.C4002_ENABLE, c4002.C4002_ENABLE,    ]    if c4002.configure_gate(c4002.MOTION_DISTANCE_GATE, gate_state):        print("启用运动距离门限成功!")    if c4002.configure_gate(c4002.PRESENCE_DISTANCE_GATE, gate_state):        print("启用存在距离门限成功!")    # 设置上报周期(10 * 0.1s = 1s)    if c4002.set_report_period(10):        print("设置上报周期成功!")def get_gpio2_status():    """读取 GPIO2 的状态并返回中文描述"""    pin_value = radar_output_pin.value()    if pin_value == 1:        return "HIGH (检测到目标)"    else:        return "LOW (未检测到目标)"def loop():    """主循环"""    ret_result = c4002.get_note_info()    if ret_result.note_type == c4002.RESULT:        print("------- 获取全部结果 --------")        # 光照强度(lux)        light = c4002.get_light_intensity()        print("光照强度: {:.2f} lux".format(light))        # 目标状态        target_state = c4002.get_target_state()        print("目标状态: ", end="")        if target_state == c4002.NO_TARGET:            print("无目标")        elif target_state == c4002.PRESENCE:            print("静态存在")        elif target_state == c4002.MOTION:            print("运动")        # 存在倒计时        presence_count_down = c4002.get_presence_count_down()        print("存在倒计时: {} s".format(presence_count_down))        # 存在目标信息        presence_target = c4002.get_presence_target_info()        print("存在距离: {:.2f} m".format(presence_target.distance))        print("存在能量: {}".format(presence_target.energy))        # 运动目标信息        motion_target = c4002.get_motion_target_info()        print("运动距离: {:.2f} m".format(motion_target.distance))        print("运动能量: {}".format(motion_target.energy))        print("运动速度: {:.2f} m/s".format(motion_target.speed))        print("运动方向: ", end="")        if motion_target.direction == c4002.AWAY:            print("远离!")        elif motion_target.direction == c4002.APPROACHING:            print("靠近!")        elif motion_target.direction == c4002.NODIRECTION:            print("无方向!")        # GPIO2 状态        print("GPIO2 输出: {}".format(get_gpio2_status()))        print("--------------------------------")def main():    """主函数"""    setup()    while True:        loop()        time.sleep_ms(10)if __name__ == "__main__":    main()

运行后,可以在shell看到:

MPY: soft rebootC4002 初始化成功!设置运行指示灯成功!设置输出指示灯成功!设置分辨率模式成功!设置检测范围成功!设置光照阈值成功!启用运动距离门限成功!启用存在距离门限成功!设置上报周期成功!------- 获取全部结果 --------光照强度: 52.60 lux目标状态: 静态存在存在倒计时: 10 s存在距离: 1.51 m存在能量: 99运动距离: 1.33 m运动能量: 99运动速度: 0.02 m/s运动方向: 无方向!GPIO2 输出: LOW (未检测到目标)
推荐阅读:
ESP32+C4002 毫米波雷达智能家居实测:人体存在感应声光控制

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  1. CONNECT:[ UseTime:0.000514s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000716s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003229s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002974s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000545s ]
  6. SELECT * FROM `set` [ RunTime:0.002099s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000567s ]
  8. SELECT * FROM `article` WHERE `id` = 500599 LIMIT 1 [ RunTime:0.013655s ]
  9. UPDATE `article` SET `lasttime` = 1783016359 WHERE `id` = 500599 [ RunTime:0.024103s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011832s ]
  11. SELECT * FROM `article` WHERE `id` < 500599 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000738s ]
  12. SELECT * FROM `article` WHERE `id` > 500599 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000432s ]
  13. SELECT * FROM `article` WHERE `id` < 500599 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001210s ]
  14. SELECT * FROM `article` WHERE `id` < 500599 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.023306s ]
  15. SELECT * FROM `article` WHERE `id` < 500599 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.017858s ]
0.177769s