Hi,
I'm trying to build a wearable device that uses a microphone (as opposed to typical optical sensors) to detect my heartbeat. I would appreciate your help in identifying a good microphone for the job. I tried the INMP401 (a MEMS microphone, link), but even pressed directly against my skin over my heart, it was not sensitive enough to pick up my heartbeat. It mostly captured background noise from my TV.
I think the ideal microphone would be small and low power (since it's going into a wearable), directional to limit background noise, and have high enough sensitivity / low enough frequency response to capture the sound of my heartbeat. In actual use, the microphone will not be pressed directly against my skin, but will be positioned against my t-shirt over my heart, so it will probably need to have pretty good sensitivity to hear my heartbeat through my t-shirt.
Thanks in advance.
I'm trying to build a wearable device that uses a microphone (as opposed to typical optical sensors) to detect my heartbeat. I would appreciate your help in identifying a good microphone for the job. I tried the INMP401 (a MEMS microphone, link), but even pressed directly against my skin over my heart, it was not sensitive enough to pick up my heartbeat. It mostly captured background noise from my TV.
I think the ideal microphone would be small and low power (since it's going into a wearable), directional to limit background noise, and have high enough sensitivity / low enough frequency response to capture the sound of my heartbeat. In actual use, the microphone will not be pressed directly against my skin, but will be positioned against my t-shirt over my heart, so it will probably need to have pretty good sensitivity to hear my heartbeat through my t-shirt.
Thanks in advance.