ZigBee 3 in 1 Shield for Arduino

Hardware and software

For debug whether a new wifi module normally work, we need the following hardware and software, as shown in Table 2-1.

Number	Name	Quality	Function
1	WiFi module	1	Wireless communication
2	Arduino shield	1	WiFi connection
3	USB to RS232	1	Transformation and connection
4	5V1A voltage adapter	1	Provide voltage
5	Antenna	1	Transmit WiFi signal
6	PC tools	1	3:7
7	Mobile tools	1	3:8

The required materials are shown in Figure 2-1.

Wifi module From Figure 2-1, wifi module has two rows of pins. If seen it in detail, there are labels for the two rows pins in wifi module, i.e., p1 and p2, which is denoted by the first row pins and the second ones. Each row of pins has 14 pins. Certainly, different type of wifi module is corresponding to the different labels. For example, wifi module is shown in Figure 2-2 has a mental shell, which facilitates heat dissipation, and its pins are labeled from 1 to 28. Similarly, all of the pins are arranged into two rows, each of which has 14 pins. Its schematic diagram could be seen in Figrue 2-3. When the 28 pins are inserted into the Arduino shield board, wifi signal is changed into serial signal, and/or vice versa. In general, there are two MAC addresses in the wifi module, which are used to look for the Application Point (Ap). The relevant context can be referred to the association in the first lesson part.

Number	Function	Direction	Description
1	VCC	Power in	5V power input
2	GND	GND	Power grand
3	WLAN_LED	O	WIFI start instruction
4	VDD	Power out	3.3V power output
5	LINK_2	O	Net gape 2 connection instruction
6	USB_P	I/O	USB signal +
7	USB_M	I/O	USB signal -
8	STA/GPIO_0	I/O	Status instruction/GPIO_0
9	GPIO_1	I/O	GPIO_1
10	ES/RST	I	Exit the passthrough/recovery factory value
11	TXOP2	A	Net gape 2 TX-P
12	TXON2	A	Net gape 2 TX-N
13	RXIP1	A	Net gape 1 RX-P
14	RXIN1	A	Net gape 1 RX-N
15	RXIN2	A	Net gape 2 RX-P
16	RXIP2	A	Net gape 2 RX-P
17	TXON1	A	Net gape 1 TX-N
18	TXOP1	A	Net gape 1 TX-P
18	RTS_N/GPIO_2	I/O	Net gape 2 RTS
20	UART_RX	I	Serial 1 RX
21	UART_TX	O	Serial 1 TX
22	RXD/GPIO_3	I/O	Serial 2 RX
23	LINK1	I/O	Net gape 1 connection instruction
24	CTS_N/GPIO_4	O	Serial 1 CTS
25	WPS/RST	I	WPS button/recovery factory value
26	TXD/GPIO_5	O	Serial 2 TX
27	VDD_1_8	Power out	Net gape 1.8V output
28	VCC	Power in	5V input

Arduino shield board

From Figure 2-1, the Arduino shield board has two power provision ways; one is RS232 interface. As show in Figure 2-1, by using the cable USB to RS232, wifi signal can be changed into USB signal to computer by RS232 interface. So, when the wifi module are inserted into the Arduino shield, the power is provided by USB cable. But, since the Arduino and the shield board are powered by USB from computer, it may be not enough for the power source. Therefore, the best way to provide voltage is the use of power adapter. This can promise the enough power. In addition, by utilizing such Arduino shield, the communication ways can be wifi and Bluetooth (ble) for the short wireless communication.