So, you’re a crime fighting ninja and want to know how much force your wicked ninja blows deliver. Learn the process of designing and building a vest that uses force sensors to determine how much force is delivered by the impact of a strike. The vest is to have two main components: the transmitter side and the receiver side. The transmitter side is implanted with piezoelectric sensors, an MCU implementing a hit detection scheme, and wireless transmission circuitry that sends a specific byte of data when a hit is detected. The receiver side consists of wireless receiver circuitry, an MCU that waits until the specific byte is received, and a TV to keep track of score and penalties.