using pulse sensor with ATtiny85 chip

[diontan524]

Hi there, I am planning to use the Pulse sensor on attiny85 chip. But looks like the code uploaded online have to be modified due to the fact that attiny85 does not have timer2 and serial communication. With added serialsoftware, I am able to serialprint words to the serial monitor with the Attiny85 chip, so im quite sure my code there has no problem. But for the timer2 to be modified as timer1, I am not sure the codes that I found online is correct or not. I tried to serial print the BPM but not luck. Can anyone help Please ?

[diontan524]

timer1 pulse rate.txt

[joelSensor]

Hi diontan524,

That looks great! I will give your code mod a test run on the ATtiny85 that I have, and add notes to our master branch (and credit you) when I get it working. Do you have your version posted on a repo somewhere?

[diontan524]

Nope i have not post this anywhere else. Thank you guys and hope to hear from u soon.

…

On Feb 22, 2017 12:52 AM, "Joel Murphy" ***@***.***> wrote: Hi diontan524, That looks great! I will give your code mod a test run on the ATtiny85 that I have, and add notes to our master branch (and credit you) when I get it working. Do you have your version posted on a repo somewhere? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#41 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AX1YfkkTCpbKs34-attEWi4EeZh-Hn2Fks5rexZogaJpZM4MFgpO> .

[diontan524]

anyone has any solution yet ?

[biomurph]

Hi,

I have an ATtiny, but it is on a Digitspark, and in order to use it on my mac I need an external USB hub thing. Please give me some time to get it all together.

In the meantime, you can use the example that is at the bottom of the Timer Interrupt Notes tab. That shows how to set up a software timer to sample the pulse sensor data.

[diontan524]

I think it can use arduino to program it. That's the way I do it, by setting the arduino as ISP

[biomurph]

Yes, I think that would work. My only ATtiny is attached to this digispark USB board. It already has the bootloader on it, etc.

[diontan524]

I see... Is it doable? I found many websites already unfortunately non of them solve this :'(

…

On Mar 1, 2017 11:54 PM, "Joel Murphy" ***@***.***> wrote: Yes, I think that would work. My only ATtiny is attached to this digispark USB board. It already has the bootloader on it, etc. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#41 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AX1YfrE9VrxmjaeLMM4ivAWqngKfarduks5rhZSzgaJpZM4MFgpO> .

[biomurph]

Is it possible for you to use the software timer?
I do know of someone who is using it. Have not been in touch with them in a while...

[diontan524]

Is it a library ? I heard the previous pulse sensor code is run by using timer 1 before it was changed to timer 2. Is it true ?

…

On Mar 2, 2017 12:14 AM, "Joel Murphy" ***@***.***> wrote: Is it possible for you to use the software timer? I do know of someone who is using it. Have not been in touch with them in a while... — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#41 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AX1YflKBRY2Y7Kcqkq774A-gqdeOcezSks5rhZlhgaJpZM4MFgpO> .

[biomurph]

Please check the Timer Interrupt Notes tab in this repo. At the end, it describes how to modify the code to use a software timer. It is not a library.

[joelSensor]

I have updated the Timer Interrupt Notes page here
https://github.com/WorldFamousElectronics/PulseSensor_Amped_Arduino/tree/master/PulseSensorAmped_Arduino_1.5.0
There are Interrupt setup notes for ATtiny 85 running at 8MHz and also at 16MHz. They reference the Adafruit GEMMA and TRINKET. They are tested and they work.

What speed master clock are you using?

I have an original Digispark, Kickstarter Edition board. It runs at 16.5MHz, which makes the timer interrupt kind of messy.

[diontan524]

ATtiny by default is 1Mhz, but I set and run it at 8Mhz

…

On Mar 4, 2017 2:35 AM, "Joel Murphy" ***@***.***> wrote: I have updated the Timer Interrupt Notes page here https://github.com/WorldFamousElectronics/PulseSensor_Amped_Arduino/ tree/master/PulseSensorAmped_Arduino_1.5.0 There are Interrupt setup notes for ATtiny 85 running at 8MHz and also at 16MHz. They reference the Adafruit GEMMA and TRINKET. They are tested and they work. What speed master clock are you using? I have an original Digispark, Kickstarter Edition board. It runs at 16.5MHz, which makes the timer interrupt kind of messy. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#41 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AX1YfsI-OhP5cEQH8TenHlWwkocfK8Sbks5riF1ngaJpZM4MFgpO> .