I am in need of a piezo electric sensor.. my aim is to measure heart beat using it.. I tried of obtaining heart beat using the sensor obtained from buzzer, but it does'nt worked satisfactorily......so can anyone please tell me the electronic components or equipments from which I can get piezo electric sensor with medium sensitivity.
piezo is not a good choice here. also size of piezo will be large. But how are you wanting to use this ? you want to make it like a stethoscope for full heart signal monitoring, or only to measure the pulse rate ?
if you want like stethscope then you can get many sizes of piezo benders. But here maybe a simple microphone might be easier and better.
If you only want to do pulse rate monitor, then even a simple LED (red) with either a photodiode or even an LDR can be made to work well if you apply it to even the fingertip.
i only want the pulse rate, then the output is connected to speaker. i try to use electret micrpophone, but it did't work. The circuit is complicated too. i really run out of ideas right now.
piezo is not a good choice here. also size of piezo will be large. But how are you wanting to use this ? you want to make it like a stethoscope for full heart signal monitoring, or only to measure the pulse rate ?
if you want like stethscope then you can get many sizes of piezo benders. But here maybe a simple microphone might be easier and better.
If you only want to do pulse rate monitor, then even a simple LED (red) with either a photodiode or even an LDR can be made to work well if you apply it to even the fingertip.
ok then simple circuit with red led and ldr even can be used, along with one opamp. then simple current gain circuit can be put in to drive speaker also.
ok then simple circuit with red led and ldr even can be used, along with one opamp. then simple current gain circuit can be put in to drive speaker also.
I replace TCRT1000 with L-53P3C 5mm phototransistor and MCP6004 with LM324D, for TX led I use red 5mm high bright 15000mcd, and all works fine.
This code, circuits and PCBs works 100%, and you can see finished device in my photo album. If there is some problem during making this just say. I have lots more pictures maded during assembling process, but I look to avoid upload of that, but if there is needs for that say.
This code, circuits and PCBs works 100%, and you can see finished device in my photo album. If there is some problem during making this just say. I have lots more pictures maded during assembling process, but I look to avoid upload of that, but if there is needs for that say.
You can use Vout for speaker amplifier or simple you can sense pulse led diode with optocoupler or transistor and make audio signal at each heart beat.
You should not mix electronic stetoscope with hearth beat metering. Thise are two different things.
You can use Vout for speaker amplifier or simple you can sense pulse led diode with optocoupler or transistor and make audio signal at each heart beat.
You should not mix electronic stetoscope with hearth beat metering. Thise are two different things.
i only want the pulse rate, then the output is connected to speaker. i try to use electret micrpophone, but it did't work. The circuit is complicated too. i really run out of ideas right now.
I already explain how he can connect speaker/buzzer to circuit.
He can use only sensing circuit without led counting part, if he wants only to hear heart beep rate on some speaker or buzzer. I provide PCB for both parts counting and sensing, PCBs are double sided. He can use only one PCB if he need only that. I dont see here problem?