16-button Inductive Keypad Using a16-Bit Ultra-Low-Power Microcontroller

Most systems of keypad are prone to breaking due to the moving parts and dependence on electrical contact. This system uses a 16-button inductive keypad using a 16-bit MCU. The Inductive sensing is capable of handling rugged and wet environment. It is also has low cost maintenance compared to other system in rugged and wet environment, and scalable keyboard. The system consist of a keypad assembly, MCU, two 4:1 analog multiplexers, and an inductive to digital converter. The system is supplied by a 5V USB power. A low dropout linear regulator is used to step down the 5V USB power to the 3.3V required by the LDC1314 inductive to digital converter and MSP430 MCU.