Test and calibrate decibel readings of fully assembled sensors

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难度
4/5
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3-5 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
arduino, cpp

调研方向

使用带有1551SFL外壳的Rev 2或Rev 3 PCB,并在工作室测试中比较装入外壳的传感器和裸露传感器。通过USB使用PuTTY或minicom以115200 baud读取测量值,然后确定该差异是线性偏移还是频率响应变化。完成的标准是已对差异进行表征,并确定了适当的软件或外壳变更。

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描述

help wanted

During development we tested the accuracy of decibel measurements from the bare sensor PCB, which proved the sensor to be accurate within a couple of decibels (dBA). However, the decibel readings appear to shift slightly once the PCB is assembled into the enclosure (which includes a layer of foam to protect the microphone). I'm not sure if this is just a linear shift in amplitude, or if the frequency response of the microphone is changed by the case/foam.

Ideally, we can do some studio testing again to fully validate this. Anyone with a couple of the sensors (one with enclosure and one without) could also do basic testing for this: use a computer with a serial monitor like PuTTY or minicom installed to view the serial output of the sensor over USB; this will show the dBA of every measurement taken. The serial port should be configured for 115200 baud.

If we can identify the discrepancy and make a software fix, that would be ideal. Otherwise, we'll need to look into foam selection and the size and placement of the microphone port to make the sensor as accurate as possible.

Let me know if you need to borrow PCBs to do this testing. Rev 2 or rev 3 PCBs with the 1551SFL enclosure should be used for this.

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C++
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