You wrote a very beautiful post on IoT. Yes, doorbell seems to be one of the very first common use of IoT and another example of IoT in household is through lightning the bulbs remotely without having to make physical contact.

What Blockchain is doing in Pharmacy industry is to ensure that stakeholders will be responsible to update the blockchain network with the right information in real-time so the tracking of thousands of medicines is easy and possible.

Supply chain is another application of IoT, I have read that the sensors are used for tracking of supplies. And as far as I know, settlement of transactions are made immediately the contracts signed by both parties reaches the destination.