基于Micropython的红外线发射

陆续更新

红外发射模块

踩坑：

1、未理解：38K红外原理
学习：38K红外通信原理_vs1838b红外接收头工作原理-优快云博客

2、红外发射模块功率不足：产品设计问题

解决方案：1、放近一点（2-3cm）；2、板件改造（详见b站视频）

红外遥控DIY之三：发射信号_哔哩哔哩_bilibili

import machine
import time

# 定义GPIO引脚
ir_pin = machine.Pin(4, machine.Pin.OUT)

# 定义38kHz的载波频率
carrier_frequency = 38000
# 计算每个周期的时间（单位：秒）
period = 1.0 / carrier_frequency
# 计算高电平和低电平的时间（单位：秒）
half_period = period / 2

# 定义发送红外信号的方法
def send_ir_signal(pulse_times):
    for idx,pulse_time in enumerate(pulse_times):
        #print(pulse_time)
        if idx%2 ==0:
            # 打开红外LED
            end_time = time.ticks_add(time.ticks_us(), pulse_time)
            while time.ticks_diff(end_time, time.ticks_us()) > 0:
                ir_pin.on()
                time.sleep_us(int(half_period * 1e6))
                ir_pin.off()
                time.sleep_us(int(half_period * 1e6))           
           
        else:
            # 信号间隔
            end_time = time.ticks_add(time.ticks_us(), pulse_time)
            while time.ticks_diff(end_time, time.ticks_us()) > 0:  
                time.sleep_us(int(half_period * 1e6))            
                time.sleep_us(int(half_period * 1e6))
        
    time.sleep_us(1000)


pulse_times_list = []

# 示例：发送红外信号（注意，这里pulse_times需要根据你实际的编码方案来设置）
pulse_times_list.append([2406,3324,470,1215,1288,420,1285,398,416,1246,1307,377,1308,373,1282,427,1304,386,1278,398,1258,404,464,1218,441,1245,463,1221,1307,400,1284,399,414,1250,460,6910,2514,3330,464,1219,1307,377,1305,403,441,1218,1301,387,1301,381,1302,380,1303,402,1283,400,1281,403,415,1245,463,1223,465,1218,1311,398,1281,402,444,1221,456,6912,2537,3305,466,1220,1306,400,1280,404,438,1223,1304,402,1277,385,1301,380,1300,385,1298,383,1300,383,459,1225,460,1224,460,1225,1304,379,1302,381,461,1220,461])



for pulse_times in pulse_times_list:
    print("发送红外信号...")
    print(pulse_times)
    send_ir_signal(pulse_times)
    time.sleep(1)

红外接受模块

踩坑：

1、在irq中断回调函数中进行时间长度计算，导致偏差太多。

优化方案：中断回调函数中仅记录，每个1秒进行计算。

# 捕获脉冲模块
def capture_ir_signal_handler(pin):
    global pulse_times
    # 记录时间戳
    current_time = time.ticks_us()
    # 存储时间戳
    pulse_times.append(current_time)


#计算脉冲模块
def calculate_pulse_times():
    global pulse_times
    # 计算每个脉冲的持续时间
    durations = []
    for i in range(1, len(pulse_times)):
        durations.append(time.ticks_diff(pulse_times[i], pulse_times[i-1]))
    
    return durations


# 存储捕获到的脉冲时间
pulse_times = []

led = machine.Pin(2, machine.Pin.OUT)

irRecv = machine.Pin(16, machine.Pin.IN, machine.Pin.PULL_UP)
irRecv.irq(trigger=machine.Pin.IRQ_RISING | machine.Pin.IRQ_FALLING, handler=capture_ir_signal_handler) 



if __name__ == '__main__':
    

    for i in range(10*60):
        print("new task")
        led.on()
        time.sleep(1)
        led.off()
        time.sleep(1)

        durations=calculate_pulse_times()
        if len(durations)>0:
                
            send_msg_text=",".join([str(x) for x in durations])
            print(send_msg_text)
            pulse_times.clear()