RaspberryPi-Sensor-Board使用文档
RaspberryPi-Sensor-Board - emakefun文档中心 (test-doc-zh-cn.readthedocs.io)
特点
- 支持8路ADC检测
- 内置MCU
- 支持树莓派 2B/3B/3B /4/zero
- 5.5x2.1DC头与接线端子供电
- 外部传感器电压3V3与5V自由切换
- 板载DC-DC降压芯片 宽电压输入：6~36V 电压输出：5V 最大电流输出： 3A
MCU规格
- 工作电压：3.3V
- MCU :STM32/STC8G
- IO: 8路ADC检测
- 与树莓派通信： I2C
- I2C地址： 0x04
硬件概述
寄存器
???扩展板MCU I2C地址为0x04，寄存地址说明如下：
-
0x10 ~ 0x17: 读取ADC原始数据
-
0x20 ~ 0x27: 读取输入电压
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0x30 ~ 0x37: 读取输入电压与输出电压之比 输入电压/输出电压
读取ADC模拟值
???众所周知，Raspberry Pi中没有ADC，因此，传感器的模拟值不能直接读取。内置在扩展板上MCU 在帮助下，你可以读10位ADC这意味着模拟传感器可以用于树莓派，共有8个可用接口。
???模拟传感器将模拟电压输入10位模数转换器。模数转换器将模拟数据转换为数字数据I2C在树莓派中输入数字数据。
在终端输入sudo i2cdetect -y 命令可以扫描连接I2C总线上的一切I2C打印设备并打印设备I2C总线地址(这里使用)PCF8591）
import time import RPi.GPIO as GPIO import smbus GPIO.setmode(GPIO.BCM) address=0x48 delta=20 time_list=[0,0,0,0] threshold=[0,0,0,0] basic_value_1=[] basic_value_2=[] basic_value_3=[] basic_value_4=[] bus=smbus.SMBus(1) def loop_print(): flag1=0 flag2=0 flag3=0 flag4=0 while True: bus.write_byte(address,0x40) bus.write_byte(address,0x41) bus.write_byte(address,0x42) bus.write_byte(address,0x43) sound1=bus.read_byte_data(address,0x40) sound2=bus.read_byte_data(address,0x41) sound3=bus.read_byte_data(address,0x42) sound4=bus.read_byte_data(address,0x43) if sound1: print("the NO.1 power of the sound is %lf"%sound1) if len(basic_value_1)<=10: basic_value_1.append(sound1) if len(basic_value_1)==10: value=0 for i in range(10): value =basic_value_1[i] threshold[0]=(value/10) delta if 0 not in threshold: if sound1>threshold[0] and flag1==0: time_list[0]=time.time_ns()/10**9 flag1=1 time.sleep(0.0) if sound2: print("the NO.2 power of the sound is %lf"%sound2) if len(basic_value_2)<=10: basic_value_2.append(sound2) if len(basic_value_2)==10: value=0 for i in range(10): value =basic_value_2[i] threshold[1]=(value/10) delta if 0 not in threshold: if sound2>threshold[1] and flag2==0: time_list[1]=time.time_ns()/10**9 flag2=1 time.sleep(0.0) if sound3: print("the NO.3 power of the sound is %lf"%sound3) if len(basic_value_3)<=10: basic_value_3.append(sound3) if len(basic_value_3)==10: value=0 for i in range(10): value =basic_value_3[i] threshold[2]=(value/10) delta if 0 not in threshold: if sound3>threshold[2] and flag3==0: time_list[2]=time.time_ns()/10**9 flag3=1 time.sleep(0.0) if sound4: print("the NO.4 power of the sound is %lf"%sound4) if len(basic_value_4)<=10: basic_value_4.append(sound4) if len(basic_value_4)==10: value=0 for i in range(10): value =basic_value_4[i] threshold[3]=(value/10) delta if 0 not in threshold: if sound4>threshold[3] and flag4==0: time_list[3]=time.time_ns()/10**9 flag4=1 time.sleep(0.0) if (0 not in time_list) and (0 not in threshold): print(threshold) print(time_list) break loop_print()