Arduino Uno R3 Nano V3.0 Mega 2560 Mega 328 Kit     Features 1-channel relay module: controlled by the microcontroller via a 5 V digital output. With display of the current and the action of the relay. Used as home appliance control PIR motion sensor: the passive infrared sensor is an electronic sensor that detects infrared radiation radiated by objects in its field of vision. These sensors are widely used as motion detectors SG90 9G servo motor: used for remote controlled helicopters, micro robots, boats and other types of arduino toys or experiments DHT11: The digital temperature and humidity sensor is a digital signal output with a combined sensor of temperature and humidity calibrated Soil moisture sensor: In general, soil moisture is the most sensitive to moisture ambient JoyStick module: 2-axis rocker module with joystick potentiometer with 2-axis analog output (X, Y), digital output 1-button (Z). Red LED diode: Common anode Digital display: 4 digits; 4 bit 7 segment Ultrasonic distance sensor: use I / O trigger for a high level signal of at least 10us, when activated it sends a series of ultrasonic pulses at 40 kHz and receives the echo from an object   Kit parts list 1 0.96 inch OLED screen  1 x 1602 liquid crystal display module 1 1-channel relay module 1 x DHT11 temperature and humidity sensor 1 x ultrasonic sensor HC-SR04 1 matrix display 8x8 stitches 1 x JoyStick module 1 4-digit digital screen 1 x TTP223B touch sensor 1 x infrared sensor HC- SR501 1 x soil moisture sensor 1 x obstacle avoidance sensor 1 SG90 9G servo motor 2 x breadboard 20 x diodes (red)  30 x resistor (220 1K 10K) 20 x DuPont cables (male to female)