What makes a city smart – digital infrastructure and technology. Procuring the correct parts for your smart city application is extremely important. When I was looking at it, I found some products that would work great for the intelligence portion of the smart city product. 
Learn how to assemble a "virtual pen" with Arduino 33 BLE Sense that determines which digit the user is writing based on the motion they make holding the pen without using a camera. 
This article serves as an introduction to ultrasonic sensors and explains how you can get them up and running in no time using an ESP8266 development board. 
Capacitive proximity and touch sensors represent great for adding engaging and intuitive input options to DIY projects. 
An overview and comparison of some of the most common types of batteries and what you should look out for when working with specific batteries chemistries. 
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