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  • Natdguyen commented on ohoilett's instructable DIY Arduino Pulse Sensor1 year ago
    DIY Arduino Pulse Sensor

    Hey I did revise my circuit a bit, but it seems like it will not work like this.Im using the MCP6002 now with the same resistors and capacitors like you.It still shows me values like 190 in the graph. Can you look over it another time? That would be great

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  • Natdguyen commented on ohoilett's instructable DIY Arduino Pulse Sensor1 year ago
    DIY Arduino Pulse Sensor

    Hi, I do have some difficulties in finding a circuit to produce a negative voltage for the Arduino. So will it be the better choice to buy a op amp like the MCP6002?

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  • Natdguyen commented on ohoilett's instructable DIY Arduino Pulse Sensor1 year ago
    DIY Arduino Pulse Sensor

    Hi. Im a german student who wants to build your Pulse Sensor but there are some difficulties that I'm not able to solve. I hope you can help me with it.My Pulse Sensor does not work and I really dont know why. In the Plotter it only shows 0 as a pulse or 190 all the time.Could you look over it and maybe tell me if I do something wrong?It's my first time working with Fritzing so I'm sorry for the mess.

    Hi thanks for the reply:).(1) I'm using the TL072CP op amp(2) Values are the same as yours but splitting the 560 nF to 470 nF and 100 nF(3)Hard question actually. I would assume it's okayish, but my knowledge about circuit diagrams are not the best.To the solutions. I actually didn't know that I need to power the TL072CP op amp with a positive and negative voltage.(5) That's actually just a dumb mistake because of my mess I did there so in reality that one is not there.(6) I will.So my problem now is how to put up a negative voltage. Since I thought the TL072CP is the same as the MCP6002, but the MCP6002 probably doesnt need negative voltage, does it? And this question may be a bit stupid, but what does non inverting/inverting pin actually mean? Is it the meaning of IN- and IN+. To be h...

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    Hi thanks for the reply:).(1) I'm using the TL072CP op amp(2) Values are the same as yours but splitting the 560 nF to 470 nF and 100 nF(3)Hard question actually. I would assume it's okayish, but my knowledge about circuit diagrams are not the best.To the solutions. I actually didn't know that I need to power the TL072CP op amp with a positive and negative voltage.(5) That's actually just a dumb mistake because of my mess I did there so in reality that one is not there.(6) I will.So my problem now is how to put up a negative voltage. Since I thought the TL072CP is the same as the MCP6002, but the MCP6002 probably doesnt need negative voltage, does it? And this question may be a bit stupid, but what does non inverting/inverting pin actually mean? Is it the meaning of IN- and IN+. To be honest I thought that this would mean negative input and positive input..And to google Hangout. I'd like to write with you private, but maybe tomorrow, because it's already really late in Germany. And my english talking skill are not the polished so I dont prefer talk.

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  • Natdguyen commented on ohoilett's instructable DIY Arduino Pulse Sensor1 year ago
    DIY Arduino Pulse Sensor

    can i use the op amp TL072CP?

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