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by obt123
Sun Jan 27, 2019 10:05 am
Forum: Troubleshooting
Topic: ADC ISSUE: Capturing Analog Signals from Microphones
Replies: 2
Views: 103

Re: ADC ISSUE: Capturing Analog Signals from Microphones

Your ADC is a 10 bit device. Your code is interpreting its output as numbers in the range 0 to 1023. Audio signals are usually AC and it is more intuitive to think of those 10 bits as -512 to +511. Subtract 512 from your numbers and perhaps they will seem more related to the sound. Thanks drgeoff f...
by obt123
Sun Jan 27, 2019 4:47 am
Forum: Troubleshooting
Topic: ADC ISSUE: Capturing Analog Signals from Microphones
Replies: 2
Views: 103

ADC ISSUE: Capturing Analog Signals from Microphones

Hi, The issue is that i'm using a electret mic connected to an amplifier (LM386) and am hearing good sound from the headphone. Now, I connected the output to the MCP3008, and ran an Adafruit test code for the channel but the number don't make a lot of sense! if the room is quiet of noisy, the differ...
by obt123
Thu Nov 01, 2018 7:58 pm
Forum: Automation, sensing and robotics
Topic: High range microphone
Replies: 0
Views: 138

High range microphone

Hi, I am trying to design a microphone circuit that can get sound from a 15ft-20ft distance, and process the data through the PI. I am using small microphone (EM6027LW-42C) 50Hz ~ 10kHz Analog Microphone Electret Condenser 1V ~ 10V Omnidirectional (-42dB ±3dB @ 94dB SPL) Wire Leads I have tried to a...

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