Relay Shield for Arduino - Multi-Channel Stackable multiplexer it can be simple to

it can be simple to confuse it with RFID technology

This is a multipurpose boost converter

Product Temperature Sensor DS18B20 Module for Arduino Interface Digital Temperature detection range -55 ° C ~ +125 ° C (-67 ° F ~ +257 ° F) Temperature range -55 °C ~ +125 °C Supply Voltage 3

There's two LEDs for monitoring the charge rate

Relay Shield for Arduino - Multi-Channel Stackable multiplexer it can be simple toSimple Load Switching for Arduino, ESP32, and Automation Builds The Relay Shield for Arduino is a practical relay module from Circuitrocks for students, makers, and repair friendly builds. It fits well in projects that need switching external loads, while keeping setup straightforward for testing and prototype work. Compared with generic parts, this product stands out through details such as relay module. That makes it a solid choice for Arduino,