How do I control a PWM fan with my heart rate?

[s355]

It should work like this. The fan is off at 50% heart rate or less. When heart rate is 50% or higher, each 1% my HR increases or decreases, the fan's speed will increase/decrease by 2%. It should be at full speed when my HR is 100%. How do I do the PWM, and how do I turn off the fan with pin 4 when my heart rate is less than 50%? Is this possible with the Alta HR as control input?

 

[kanewolf]

It should work like this. The fan is off at 50% heart rate or less. When heart rate is 50% or higher, each 1% my HR increases or decreases, the fan's speed will increase/decrease by 2%. It should be at full speed when my HR is 100%. How do I do the PWM, and how do I turn off the fan with pin 4 when my heart rate is less than 50%? Is this possible with the Alta HR as control input?

How do you define percentages of heart rate?
The Alta HR undoubtedly has bluetooth. You would need to write the software to implement what you want.

 

[s355]

How do you define percentages of heart rate?
The Alta HR undoubtedly has bluetooth. You would need to write the software to implement what you want.

It is % of max heart rate, which is 220-age. I can get my Fitbit data from the web API.

 

[kanewolf]

It is % of max heart rate, which is 220-age. I can get my Fitbit data from the web API.

What do you want to connect this fan to?
Does it have to be a PWM fan? Why not a straight DC fan? Definitely a lot simpler.

 

[s355]

@kanewolf Anything that can receive the BT HR monitor's signals and control the fan. I only have PWM fans, no 3 wire fans.

 

[kanewolf]

@kanewolf Anything that can receive the BT HR monitor's signals and control the fan. I only have PWM fans, no 3 wire fans.

A raspberry PI would be the obvious choice. Using the GPIO pins. But they are 5V and most fans are 12V. -- https://www.raspberrypi.org/forums/viewtopic.php?t=236017

 

[punkncat]

Lol, riding a stationary bike?

 

[s355]

A raspberry PI would be the obvious choice. Using the GPIO pins. But they are 5V and most fans are 12V. -- https://www.raspberrypi.org/forums/viewtopic.php?t=236017

How do I establish a connection between the Pi and the Alta HR and read the live HR from it?

 

[kanewolf]

How do I establish a connection between the Pi and the Alta HR and read the live HR from it?

Do you not know how to google ANYTHING??? First hit on "raspberry pi fitbit" -- https://community.fitbit.com/t5/Web...g-python-fitbit-on-a-Raspberry-Pi/td-p/707702
Second hit -- https://navaem.github.io/2020/connecting-a-fitbit-to-a-raspberrypi/
https://www.hackster.io/dave34/raspberry-pi-health-dashboard-works-w-fitbit-apple-health-e4af30

 

[USAFRet]

What will this fan be blowing on? What is it cooling?

 

[s355]

Do you not know how to google ANYTHING??? First hit on "raspberry pi fitbit" -- https://community.fitbit.com/t5/Web...g-python-fitbit-on-a-Raspberry-Pi/td-p/707702
Second hit -- https://navaem.github.io/2020/connecting-a-fitbit-to-a-raspberrypi/
https://www.hackster.io/dave34/raspberry-pi-health-dashboard-works-w-fitbit-apple-health-e4af30

API won't work. It's a direct BT connection. That way, when the internet goes offline, the Pi will still receive signals.
Second one is the wrong Fitbit,
3rd one doesn't collect live data.

 

[kanewolf]

API won't work. It's a direct BT connection. That way, when the internet goes offline, the Pi will still receive signals.
Second one is the wrong Fitbit,
3rd one doesn't collect live data.

Sorry. I don't have a fitbit.
I guess I don't understand why the API with a bluetooth connection doesn't work. It seems to meet the requirements you identified.

 

[Ralston18]

@s355

Interesting.

First write the code/script necessary to change the fan speed based on a manually entered heart rate.

Get the fans to respond as per your requirements.

Then work on the necessary code to capture the heart rate via the fitbit and pass the fitbit heart rate to the "fan speed" code.

= = = =

That said, unless there is some definitive correlation between your heart rate, the game you are playing, and the cooling needs of your system, things may not end well.

Cooling requirements are based on what the CPU and GPU are doing. Not how fast your heart is going during game play.

Just my thoughts on the matter.