From biology to technology

@hisham343 I have an older model, but that sounds right, I will be upgrading next year. My point was simply to check what other alternate devices are using as that may bring the price down.

The question now for the sake of connectivity and versatility will uno be enough or should I shift to other solutions?

@hisham343 I don't think UNO has BT or WiFi, you will be better with an ESP32 or maybe an ESP8266 or a few other multi board solutions but esp32 offers a lot of bang for the buck.

Hi @hisham343,

   Microcontrollers like Arduino or ESP 32 typically have Analogue to digital converters designed for measuring voltages in the range 1 to 5 Volts, from relatively low impedance sources.

I think you will be looking to measure much smaller voltages from relatively high impedance sources ... so you will need appropriate amplifiers to produce signal levels suitable for the microcontrollers. Sampling and amplifying the signals you wish to analyse is probably more critical than the subsequent digital processing.

I guess it possible to devise circuits using general purpose operational amplifiers, but as there is a big market for this kind of electronics, you may find convenient devices that are specialised for the purpose.

Good luck with your project.

@hisham343 Hi Hisham, "very economical solution" doesn't describe what you want to do. You have to start with a specific goal like, "I want to attach a sensor to a person's chest and then read the data from the sensor with an Arduino and then save the data to a file." or "I want to read a thermometer and then turn on a warning light if the temperature is too high."

Part 2: Please describe what you have already done with an Arduino. Have you used one to blink a LED on and off? Have you used one to read the value from any sensing device?

These answers will get you started on the path to success.

Have you seen this article on Microcontrollers Lab?

https://microcontrollerslab.com/max30102-pulse-oximeter-heart-rate-sensor-arduino/

They also have a write up on it using an ESP32 and ESP8266.

Since I have recently been diagnosed with a heart problem, I’m interested in putting this project together to see how it works and if it provides useful information. I have the 30102 chip on order.

Cheaper than an Apple Watch! 😊 

Regards,

Lee

Posted by: @davee

Hi @hisham343,

   Microcontrollers like Arduino or ESP 32 typically have Analogue to digital converters designed for measuring voltages in the range 1 to 5 Volts, from relatively low impedance sources.

I think you will be looking to measure much smaller voltages from relatively high impedance sources ... so you will need appropriate amplifiers to produce signal levels suitable for the microcontrollers. Sampling and amplifying the signals you wish to analyse is probably more critical than the subsequent digital processing.

I guess it possible to devise circuits using general purpose operational amplifiers, but as there is a big market for this kind of electronics, you may find convenient devices that are specialised for the purpose.

Good luck with your project.

Hi davee 

Thank you for the clarification. I am already aware of that and testing several op amp circuits and experimenting with physical active and passive low pass filters + software filters using frequency domain analysis. If you have any recommendations? 👍

@eliza your totally right I must have a written structure for my vision I will write it dowm .post it and wait for your valuable input 🤗

@lee-g Hi lee 

Sorry to know you have a heart problem.  But I hope everything is under control. We may experiment togather and I will update you with the results. I ordered an ESP32S and I started playing with emulators until it arrives.take care and have a nice day. 

Hi @hisham343,

RE: I am already aware of that and testing several op amp circuits and experimenting with physical active and passive low pass filters + software filters using frequency domain analysis. If you have any recommendations?

  It sounds like you are already on track ... I hope you didn't feel I was patronising you.

  Sorry, I don't know much about the medical field, but I was aware companies like Analog Devices had some specialised devices, like the ADAS1000. Such devices are more expensive than 'everyday' operational amplifiers, but still low cost compared to a mid-range smartphone, and I guess they are producing useful devices that meet a real need and address some of the difficult issues.

Note, I only mention Analog Devices because it was the first supplier I thought of ... I would presume a more detailed search would reveal others.

If I undertook a project along the lines you have outlined, I think I might start it by trying to understand and evaluate the offerings of such suppliers. 

Best wishes, and good luck.