The first sensor that I come across every day are the sensors in my Fitbit. There are multiple sensors in my Fitbit to monitor my heart rate, steps, sleep and other biometrics. The green LED light under my Fitbit monitors these biometrics and sends them back to to my phone. I can change the information that is sent back through my movement throughout the day. You can tell that the sensor is working so long as the green light is on and flashing on the bottom of the watch. Also there are ways to program your watch so it vibrates and sends you a notification that lets you know if you are low on steps for the day. This sensor is very sensitive since it has to be accurate in the information that it sends back.
There are also sensors in my phone and airpods. The sensor in my phone is through my camera that detects my face and reads it to make sure it's actually me when I open my phone. The camera uses facial recognition techniques to map and store what your face looks like so it can offer more security if other people want to get into your phone. It's easy to know that the sensor is working because your phone will unlock or stay locked when it reads your face.
The next sensor that I interact with frequently is the one in my apartment building to be able to get into my building. It's a simple ID scanner that scans my NYU id and then allows the turn style to move so whoever lives in the building has the ability to get in. It's a small black box in front of the turn style that shows a red light when you can't enter and a green light after you touch the ID card to the sensor. Scanning the ID is only way to interact with the device as it's not programmed to read anything else and the scanner is only looking for whether or not that person lives in the building.
I also interact with a sensor to take the subway. With the OMNY system, I can tap my phone and the sensor reads the credit card on my phone and automatically takes out the payment. So long as there is a tap credit card with you or on your phone, the sensors interact with Apple pay, Samsung pay, google pay and any tap credit cards and they are on every subway turn style and bus in New York City. This is the only stage of interaction since after you tap the card/phone the normally blue border lights turn green and it makes a small sound that lets you know you can go through the turn style.
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