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Transmitter (Tx):
Receiver (Rx):
Proximity switches are the most common solution for non-contact detection. The inductive type is the widely used proximity switch, which uses electromagnetic waves to detect the metal object near the sensor detection surface. In application, this is a very simple technology to detect 1”~2” metal objects.
The logic level converter is a small device that safely steps down 5V signals to 3.3V AND steps up 3.3V to 5V at the same time. A Logic Level Converter is very easy to connect and use since it doesn’t need any programming, all you have to do is connect the 5V wire on one side and the 3.3V on the other.
This module allows you to detect when sound has exceeded a set point you select. Sound is detected via a microphone and fed into an LM393 op amp. The sound level set point is adjusted via an on board potentiometer. When the sound level exceeds the set point, an LED on the module is illuminated and the output is sent low. It has working voltage of 3.3-5V.
This motor driver expansion board is based on the L293D chip which is designed to drive up to 4 bidirectional DC motors with individual 8-bit speed selection. It can also drive 2 stepper motors (unipolar or bipolar), single coil or double coil, interleaved or micro-stepping. It contains 4 H-bridges which provide up to 0.6 A per bridge (1.2A peak) at voltages from 4.5 V to 36 V. This shield has pull down resistors to keep the motors disabled during power up. It also features a 2-pin terminal block to ensure separate logic and motor external power supplies. This expansion board is compatible with Arduinos Mega, Diecimila, and Duemilanove. This motor driver shield is capable of driving:Four DC motors and two servos, Two DC motors, stepper motor, and two-way servo, Two stepper motors and servos.
ON Semiconductor L14G3 
KY-021 Mini Magnetic Reed Module for Arduino 
MPU9250 IMU 9DOF MPU-9250 
