Pin Assignments of Extremely Simple! Standard App

Functions of pins used by the Extremely Simple! Standard App

Functions and arrangements of pins used by the Extremely Simple! Standard App (App_Twelite)

Pin Assignments

Pin Name	Function
`VCC` `GND`	Power Input
`DIx` `AIx`	Digital/Analog Input
`DOx` `PWMx`	Digital/Analog Output
`TX` `RX`	UART
`SCL` `SDA`	I2C
`Mx` `BPS`	Configuration Input
`RST`	Reset Input

x represents any digit. For example, M1 M2 M3 are collectively represented as Mx.

Power Input

Connect a 3.3V (2.3-3.6V) power supply to VCC/GND.

Digital and Analog Input/Output

DIx/DOx, AIx/PWMx pins transmit signals synchronously with matching pin numbers.

Digital	Analog
Input on `DIx` → Output on `DOx`	Input on `AIx` → Output on `PWMx`

Digital inputs are internally pulled up.

In the Extremely Simple! Standard App, the voltage range for analog input is set to 0-2V.

If a voltage above 2V is input, such as by connecting to VCC, it will be treated as unused.

Serial Communication

UART

TX/RX are used for UART transmission and reception. Specifically, they are used in the following cases:

Wireless signal transmission
- UART signal transmission
- I2C signal transmission (on the parent device side)
Wired communication with external devices
- Output of data received wirelessly
- Input of data to be sent wirelessly
Firmware management
- Firmware setting changes (Interactive Mode)
- Firmware rewriting

I2C

SCL/SDA pins are used to connect I2C target devices.

Configuration Input

By leaving the Mx pins unconnected or connecting them to GND, you can switch operation modes such as parent, child, and repeater (Operation Modes).

By leaving the BPS pin unconnected or connecting it to GND, you can change the UART baud rate from 115200bps to other values (Alternative Baudrate).

Reset Input

By connecting a push button between the reset input pin RST and GND, you can implement a reset button. RST is internally pulled up.