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Circuit Python

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may i know what is the code you used for heart rate sensor using raspberry pi? may i get explanation on how can we use raspberry to run and show output of heart rate signal? i’m just entering pi, your advise and explanation would be much helpful. I have tried uploading code from arduino ide to raspberry pi, it prompted to enter passsword. but the root password i entered did’t work. can anyone help?

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Question

  1. How to use Rpi to read AD8232 heart rate signal?
  2. How to use Arduino IDE to upload Arduino code to Rpi?

Answer

  1. AD8232 ECG module outputs analog signal. Rpi does not have any analog to digital pin to entertain analog signals (I feel jealous that Arduino has many built in ADC pins!). So you need to use an ADC chip/module such as MCP3008/MCP3208/ADS115/HX711/ADS1256 (8 bit to 24 bit resolution) etc to do the conversion for Rpi to handle.
  2. You cannot use Arduino to upload code to Rpi. Rpi has its own IDE which is called Raspbian. You might like to google newbie tutorials to start learning Rpi. You may also like to read MagPi, a free magazine for Rpi newbies and ninjas alike. As said earlier, Arduino might use its built in ADC pins to talk to AD8232. So it is very unlikely that the Arduino code can be directly used by Rpi. Of course you can study the Arduino code and try to translate it to Rpi python.

ad8232 setup

You may like to read the references to get a very rough idea of how Rpi controls the AD8232 ECG chip.

Warning to Rpi and electronics newbies learning the AD8232 ECG module

ECG signal is analog and often has big noise problems as mentioned in the referenced post below. Newbies for sure find things difficult. You may need a small team of basic Rpi hardware and software beginners to do a long term, say at least three months to one year (depending on your background) to complete a college level group project. You also need a US$300 digital storage oscilloscope to help displaying signals (especially the nose signals).

Recommending CircuitPython for Rpi to newbies

The learning curve of Rpi Raspbian for newbies is very deep. I did find it discouraging and depressing learning linux terminal commands when I first tried Rpi a couple of years ago. At that time I already had 5 hobbyist years experience on Arduino but still find Rpi linux very newbie unfriendly. Yes, Rpi GUI Desktop is much newbie friendly now. But for those electronics newbies, trying things beyond blinking a led to reading ECG signals is still a long and winding journey.

To shorten the long journey, I would recommend CircuitPython for Rpi. You may like to read Lady Ada’s tutorials to know more.

CircuitPython overview – Lady Ada

CircuitPython for Rpi – Lady Ada

Installing CircuitPython for Rpi – Lada Ada

circuitpython

Tip to poor hobbyists who cannot afford AdaFruit and SparkFun stuff

I am a huge fan of both AdaFruit and SparkFun, and I am very grateful that I have been learning so many DIY stuff from them.

But I have never bought any of their products because I cannot afford.

Fortunately almost all their stuff are open source, and as SparkFun happily says, their good things got copycated in some 6 weeks after announcement.

In other words, I need only to wait for 2 months or so, to get copycat, legal, but a bit lower quality versions from TaoBao (sort of AliExpress). And I have never bought anything from eBay or Amazon, because TaoBao is often many times cheaper. For those who are jealous that I can buy cheap things, I must point out that the minimum hourly wage (US$5) in my place is also many times lower, and what is worse, property price and rent is ridiculously many times higher. In other words I don’t have much money left to buy high class SparkFun and AdaFruit stuff 😦

References

Raspberry Pi 3B+ interface with Heart Monitor AD8232 using MCP3008 and SPI pins

CircuitPython – Wikipedia

CircuitPython is an open source derivative of the MicroPython programming language targeted towards the student and beginner. Development of CircuitPython is supported by Adafruit Industries. It is a software implementation of the Python 3 programming language, written in C. It has been ported to run on several modern microcontrollers.

CircuitPython is a full Python compiler and runtime that runs on the microcontroller hardware. The user is presented with an interactive prompt (the REPL) to execute supported commands immediately. Included are a selection of core Python libraries. CircuitPython includes modules which give the programmer access to the low-level hardware of Adafruit compatible products as well as higher level libraries for beginners.

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