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The module is designed for two contacts: when pressed, they are closed and open when released. There are also 3 outputs on the board: I, S, + 5V. Contact I is connected to the common wire of the circuit, S is the output of the module and + 5V is connected to the power supply.

Arduino Passive Piezoelectric Buzzer Module Keyes KY006 KY 006  KY-006 can produce a range of sound tones depending on the input frequency.

This module consists of a common cathode 5mm Red/Green LED and a 0Ω resistor, Since the operating voltage is 2.0v ~2.5v you’ll need to use limiting resistors to prevent burnout when connecting to the Arduino.

Active Buzzer Module KY012 KY 012 KY-012 Arduino module produces a single-tone sound when the signal is high. To produce different tones use the KY-006 Passive Buzzer module.

This module consists of a 5mm RGB LED and three 150Ω limiting resistors to prevent burnout. Adjusting the PWM signal on each color pin will result in different colors.

Arduino KY018 KY 018  KY-018 Photoresistor module, used to measure light intensity. It can determine the presence or absence of light.

Arduino IR receiver module KY022 KY 022 KY-022 reacts to 38kHz infrared light. Infrared IR Sensor Receiver Module for Arduino adopts an 1838 infrared receiving head. Light resistance, strong electromagnetic interference, built-in infrared dedicated IC, can work under 500 lux light intensity.

KY023 KY 023 KY-023 Arduino joystick module, uses a biaxial potentiometer to control the X and Y-axis. When pushed down, it activates a switch. Based on the PS2 controller’s joystick, it’s used to control a wide range of projects from RC vehicles to color LEDs.

Arduino KY-027 Magic Light Cup Module is a set of two boards, each one has a led and a mercury tilt switch. Using PWM to drive the LEDs on each module you can achieve the effect of light being “magically” transferred from one module to the other when tilting them.

Digital Temperature Sensor KY-028 for Arduino, measures temperature changes based on the thermistor resistance. This module has both digital and analog outputs, there’s a potentiometer to adjusts the detection threshold on the digital interface.