我需要帮助才能从带有树莓派的重力式声波计中获取实际值。
我有一个python程序来获取这些详细信息
import sys
sys.path.append('../')
import time
from DFRobot_ADS1115 import ADS1115
ADS1115_REG_CONFIG_PGA_6_144V = 0x00 # 6.144V range = Gain 2/3
ADS1115_REG_CONFIG_PGA_4_096V = 0x02 # 4.096V range = Gain 1
ADS1115_REG_CONFIG_PGA_2_048V = 0x04 # 2.048V range = Gain 2 (default)
ADS1115_REG_CONFIG_PGA_1_024V = 0x06 # 1.024V range = Gain 4
ADS1115_REG_CONFIG_PGA_0_512V = 0x08 # 0.512V range = Gain 8
ADS1115_REG_CONFIG_PGA_0_256V = 0x0A # 0.256V range = Gain 16
ads1115 = ADS1115()
while True :
#Set the IIC address
ads1115.setAddr_ADS1115(0x48)
#Sets the gain and input voltage range.
ads1115.setGain(ADS1115_REG_CONFIG_PGA_6_144V)
#Get the Digital Value of Analog of selected channel
adc0 = ads1115.readVoltage(0)
time.sleep(0.2)
adc1 = ads1115.readVoltage(1)
time.sleep(0.2)
adc2 = ads1115.readVoltage(2)
time.sleep(0.2)
adc3 = ads1115.readVoltage(3)
print "A0:%dmV A1:%dmV A2:%dmV A3:%dmV"%(adc0['r'],adc1['r'],adc2['r'],adc3['r'])
它显示类似
的值A0:0mv A1:1098mV A2:3286mV A3:498mV
但是我不知道如何获得以分贝为单位的实际声音值。
答案 0 :(得分:0)
您可以在这里找到文档: https://wiki.dfrobot.com/Gravity__Analog_Sound_Level_Meter_SKU_SEN0232
回答您的问题:
对于此产品,分贝值与输出呈线性关系 输出电压为0.6V时,分贝值为 30dBA。当输出电压为2.6V时,分贝值应为 130分贝。校准是在出厂之前完成的,因此您 不需要校准。这样我们就可以得到这种关系:分贝 值(dBA)=输出电压(V)×50 </ strong>
因此,您需要检查将声级计连接到哪个连接器(A0,A1,A2或A3)。将该值(似乎以mV为单位)转换为V,然后乘以50。 或简单地将您的价值除以20。