The MAX30100 is a complete solution of Pulse Oximetry System and Heart Rate Sensor. The MAX30100 provides a very small solution without sacrificing optical or electrical performance.

Color is a Light to Digital Color Converter with IR Filter. The TCS3472 Device provides a digital red, green, blue (RGB) return and sharp light detection values. An infrared blocking filter, integrated in the chip and located in the color-sensing photodiodes, minimizes the infrared spectral component of the received light and allows color measurements to be made accurately.

This unit communicates with the M5Core through the Grove (I2C) port. The address is 0x29.

The Earth Unit is a Sensor for measuring Humidity in Soil or Similar Materials. The Soil Moisture Sensor is quite simple to use. The two large stake-type sensors act as probes for the sensor, acting together as a variable resistance. The higher the moisture in the soil, the better the conductivity between the two, so that the sensor results in less resistance and higher GIS output.

You can read the moisture in the soil through ADC. Within this unit, there is an extra potentiometer to change the measurement range.

This module has two buttons of different colors. They share exactly the same mechanism, the status of the button can be detected by the status of the input pin, just capture the high / low electrical level.

This unit communicates with the M5Core through the Grove B port.

IR is an Infrared Photoelectric Sensor. The infrared remote control is widely used in consumer electronics; it can be used to operate devices such as televisions, DVD players or other household appliances within a short distance. Since this unit comes with a transmitter and receiver, you can practice not only IR encoding, but also IR decoding.

The Joystick is very similar to the 'analog' joystick on PS2 controllers (PlayStation 2). The X and Y axes are two 10k potentiometers that control 2D movement, generating analog signals. The joystick also has a button that can be used for special applications, so the entire unit can emit X-Y movement signals in both directions and in the Z direction.

This unit communicates with the MSCore via the GROVE A interface. The I2C address is 0x52, Reading the data transferred from the Joystick, you can obtain the movement information from the Joystick.

Angle is a 10K potentiometer that can be used for continuous control, such as volume, brightness or engine speed. A potentiometer is a manually adjustable variable resistance with three terminals. Two terminals are connected to a resistive element, the third terminal is connected to an adjustable cleaner. The position of the wiper determines the output voltage. The output voltage is captured and converted by AD in ESP32 on portB.

The MFRC522 operates in the frequency range of 13.56 MHz and uses the principle of modulation and demodulation to interact with the RF proximity card. This unit can perform the function of the card reading and writing device, to identify and record various information on the card, to encode and authorize an RF card.

This module is designed with an N20 Engine and includes small propellers. This N20 motor has a supply voltage of 5V. And it has a rotation speed of 8800RPM.