【ART-Pi】IoT expansion board based on ART-Pi-974688A

As an expansion board for the Internet of Things, this system mainly implements hardware resources such as Bluetooth, WIFI, Ethernet, and NB-IOT and leads to all IO pins. It also leads to additional communication interfaces such as SPI, IIC, and serial ports.

The following is an introduction to the functions used:

1. Bluetooth and WIFI

Bluetooth and WIFI use the resources that come with the ART-Pi core board. Using WIFI and Bluetooth on the core board saves resources and maximizes the use of the device's resources.

2. NB-IOT communication chip

(1) NB-IOT stands for Narrowband Internet of Things. This technology is a 3GPP protocol standard LPWA (Low Power Wide Area Network) solution based on LTE network architecture. It provides better performance through its uplink and downlink retransmission, power spectral density improvement and other solutions. LTE has a gain of up to 20dB, and through the PSM mode in the protocol, the module can reach uA-level sleep state power consumption, making it widely used in various low-speed applications, not sensitive to delay, and not requiring strong mobility. scenario, which is more applicable to the scenario of the Internet of Things.

(2) This expansion board uses Ebyte NB-IoT module IoT wireless communication module EA01-S. This module has low power consumption, small size, full Netcom support, and supports various cloud platforms. The chip is easy to use, friendly to novices and suitable for learning. Using the NB-IOT and RT-Thread systems, you can learn more systematic and in-depth knowledge of the Internet of Things.

3. Ethernet module

Ethernet is a common network communication method in life. Ethernet modules can be used to easily learn network knowledge such as TCP and UDP. Through the onboard Ethernet module, more functions of the development board can be realized, which is very useful. Network knowledge is very important for IoT learners, and the onboard Ethernet module can provide a better hardware learning environment.

This module uses the LAN8742A-CZ chip. LAN8742 is an upgraded version of the LAN8720 Ethernet controller and is pin-compatible. These two Ethernet control chips are used more often and have more information. They are more friendly to learners, making it easier to find information and more convenient for learning.

4. Introduction to expansion board peripherals

(1) Screen: Use the common 0.96-inch OLED display as the display device. This screen is small in size, uses SPI communication, and has good compatibility to meet daily learning use.

In addition, the core board has its own RGB888 screen interface. When the 0.96-inch display is not enough, you can use the core onboard interface to be more friendly.

(2) Sensor: The sensor has common temperature, humidity, light, and an additional MQ2 smoke sensor interface. It is very convenient to use common environmental parameter sensors to generate data and obtain better data during the learning process.

(3) Buttons, relays, buzzers, RGB lights. These are all very common parts of the learning process.

(4) With the additional power supply of the expansion board and access to CH340, the development board can be programmed and output debugging information through the serial port.

(5) Interfaces for common communication protocols such as serial port, SPI, and IIC are reserved, which is more helpful for learning.