Hello I am trying to interface my raspberry pi 4 with the olimex-ekg-emg shield following a guide on the internet. I did this through MCP3008. However I came across the Notch Filter and the Butterworth filter. I am a beginner so I don’t know what they are but I need help making them on a breadboard if possible.

 

First thing to do is get the right circuit, not the one you have!
http://sim.okawa-denshi.jp/en/TwinTCRkeisan.htm

 

I don’t know what they are but I need help making them on a breadboard

First you have to determine what frequencies you are trying to filter, before you can decide on what filter you need.

 

First you have to determine what frequencies you are trying to filter, before you can decide on what filter you need.

( http://mwl.diet.uniroma1.it/people/pisa/ARTICOLI/Memea_Raspberry_2018_TOMASSI.pdf ) I am actually trying to follow the steps here and it says 50hz notch filter and a 6th order butterworth filter to smooth out the ecg readings. Is it possible to make, say, just the notch filter on a breadboard possible?

 

( http://mwl.diet.uniroma1.it/people/pisa/ARTICOLI/Memea_Raspberry_2018_TOMASSI.pdf ) I am actually trying to follow the steps here and it says 50hz notch filter and a 6th order butterworth filter to smooth out the ecg readings. Is it possible to make, say, just the notch filter on a breadboard possible?

Yes, they can be.

A 6th order active Butterworth filter can be done with 3 op amps.
Design programs to help with that can be found on the web, such as these.

A 50Hz notch filter is for equipment operating from that line frequency, otherwise you would need a 60Hz notch.
And you can get a sharper and deeper notch if you use an op amp active notch filter (with feedback) rather than the passive one you show.

Below is the sim of a notch filter that uses a quad op amp with a very deep notch and adjustable notch frequency between 50 to 60Hz:
That also allows tweaking to adjust for component tolerances.
A discussion for that circuit is found here.

 

50Hz or 60Hz electrical pickup frequently have distortion harmonics that a single notch filter will not remove.
An ECG circuit usually feeds the common-mode interference signal inverted into the patient's right leg to cancel the interference.