This document discusses using Tinker CAD software to simulate sensors and circuits with and without Arduino. It provides an agenda that includes an introduction to Tinker CAD, hands-on use of the software, circuit simulations without and with Arduino, and developing systems for specific applications like a non-contact doorbell, intruder detection, and smoke detection. It describes learning outcomes of being able to use Tinker CAD to design and simulate circuits and develop embedded systems. It then shows several circuit simulations using components like LDRs, temperature sensors, push buttons, and buzzer. Finally, it demonstrates simulations with Arduino, including a buzzer with push button, PIR sensor, ultrasound sensor, and smoke detector circuits.