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20W Adjustable DC-DC Buck Converter with Digital Display

This is a 20W adjustable DC-DC buck converter module with digital display. It is based on LM2596 3A step-down voltage regulator and supports an input of 0~40V DC with an accuracy of ± 0.05V.
From $9.99

8x MAINS Relays board for Home Automation Wifi Compatible - ESP8266

MPRSx8 is a WIFI Compatible 8x MAINS Relays board fully compatible with Arduino, ARM, ESP8266, ESP32, PIC, RaspberryPI, ESPEasy and DOMOTICZ!!etc
From $37.99

Gravity: Analog CO2 Carbon Dioxide Gas Sensor For Arduino

"Greenhouse Effect" is melting the Earth ice core every minute and creating dangerous icebergs. By knowing the exact concentration of CO2(Carbon Dioxide), we can do something to reduce the CO2 and to protect our Earth. Here is the CO2 sensor designed by DFRobot lovely engineer.
From $46.99

Gravity: Analog Sound Decibel Noice Level Meter

This is an Arduino compatible sound level meter(also known as decibel meter, noise meter). It uses instrument circuit and low noise microphone, which enable it to accurately measure the sound level of the surrounding environment. It can be applied to environmental noise testing, such as highway noise monitoring station, bedroom noise monitoring, etc.
From $36.99

PWM 15A Single DC Motor LM2575 Driver with UVLO

This is an ultra small size DC motor driver for room limited projects, while the impressive IC - LM2575 could provide a powerful way to drive 36V@15A motors.
From $16.99

Romeo - an Arduino Robot Control Board with Motor Driver

Romeo family is an All-in-One Robot control board especially designed for robotics applications from DFRobot.
From $27.99