SainSmart MQ135 DC 5V 10-1000ppm Ammonia Gas Sensor Module Detector for Arduino

SainSmart MQ136 Semiconductor Sensor for Hydrogen Sulfide

HiLetgo ADS1115 16 Bit 16 Byte 4 Channel I2C IIC Analog-to-Digital ADC PGA Converter with Programmable Gain Amplifier High precision ADC Converter Development Board for Arduino Raspberry Pi

ELEGOO for Arduino Nano V3.0, Nano Board CH340/ATmega328P Without USB Cable, Compatible with Arduino Nano V3.0 (Nano x 3 Without Cable)

Elegoo EL-CB-001 UNO R3 Board ATmega328P ATMEGA16U2 with USB Cable for Arduino

Waveshare Dust Sensor Detector Module with Sharp GP2Y1010AU0F Onboard for Measuring PM2.5 Air Purifier Air Conditioner Monitor Supports Arduino

Elegoo EL-CP-004 120pcs Multicolored Dupont Wire 40pin Male to Female, 40pin Male to Male, 40pin Female to Female Breadboard Jumper Wires Ribbon Cables Kit for arduino

eBoot 6 Pack LM2596 DC to DC Buck Converter 3.0-40V to 1.5-35V Power Supply Step Down Module

eBoot Mini MP1584EN DC-DC Buck Converter Adjustable Power Step Down Module 24V to 12V 9V 5V 3V, 6 Pack

Adafruit MCP3008 8-Channel 10-Bit ADC With SPI Interface for Raspberry Pi

Diymore DS3231 AT24C32 IIC High Precision RTC Module Clock Timer Memory Board Beats DS1307 for Arduino