Hi, I'm a complete novice in field of electrical circuits and have zero knowledge in this domain. Yet, I wanted to work on IOT but instead of using raspberry pi and similar, I wanted some data out of few devices. For example, I have a very old traditional treadmill which reflects the speed at which it is rotating. So where actually is data stored in circuit board of this treadmill which I can transmit. So, just as a beginner, can someone help me how to start in this kind of knowledge hunt? Thanks in advance.