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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.

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

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.

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.

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

This Ultrasonic scanner kit provides a cost effective way to have such feature for your robot application.