T3-S3 MVSR Board get it now

Overview

The T3-S3 MVSR Board is an expansion baseboard for the T3-S3 V1.2 main board, adding vibration motor, microphone (I2S/PDM), speaker (MAX98357A I2S), and RTC (PCF85063ATL) functions. Its primary use case is LoRa voice transmission: the SX1262 version uses FSK modulation; the SX1280 version uses LoRa modulation. It can also be used for AI voice interaction, MP3 playback, and other audio applications. Features extremely low static current (2.77 µA deep sleep).

Quick Start

Example Support

Example	PlatformIO/Arduino	ESP-IDF	Description
T3-S3-MVSRBoard	✓		Audio, LoRa voice, RTC, vibration, SD examples

Available examples

Example	Description
DMIC_ReadData	Digital microphone read
DMIC_SD	Microphone → SD card recording
Original_Test	Factory test
PCF85063	RTC read/write
SD_Music	Play MP3 from SD card
Sleep_Wake_Up	Deep sleep & wake
SX126x_Walkie_Talkie	LoRa voice intercom
Voice_Speaker	Voice → speaker
Vibration_Motor	Vibration motor control

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code
3. Open the T3-S3-MVSRBoard project folder
4. Open platformio.ini, under [platformio] → default_envs uncomment the example to flash
5. Click ✓ to compile, connect via USB-C, click → to upload

Arduino

1. Install Arduino IDE
2. In Tools → Board Manager, search for esp32 and install esp32 by Espressif Systems
3. Copy library folders from the project libraries directory to your Arduino Sketchbook libraries folder
4. Open the example .ino file from the examples directory
5. In Tools → Board, configure:

Arduino IDE Setting	Value
Board	ESP32S3 Dev Module
Upload Speed	921600
USB Mode	Hardware CDC and JTAG
USB CDC On Boot	Enabled
USB Firmware MSC On Boot	Disabled
USB DFU On Boot	Disabled
CPU Frequency	240 MHz (WiFi)
Flash Mode	QIO 80 MHz
Flash Size	16MB (128Mb)
Core Debug Level	None
Partition Scheme	16M Flash (3MB APP/9.9MB FATFS)
PSRAM	OPI PSRAM
Arduino Runs On	Core 1
Events Run On	Core 1

6. Select the correct port and click Upload

If upload fails: hold BOOT, press RST, release RST, then click Upload.

Development Platforms

1. MicroPython
2. Arduino IDE
3. PlatformIO
4. Visual Studio Code

Video

Key Features

• ESP32-S3FH4R2 dual-core LX7 @ 240 MHz, Wi-Fi + Bluetooth 5.0
• SX1262 (868/915 MHz, FSK) or SX1280 (2.4 GHz, LoRa) — matches T3-S3 main board
• MAX98357A I2S speaker amplifier (9 dB gain default)
• Microphone: MSM261S4030H0R I2S (V1.0) / MP34DT05-A PDM (V1.1)
• PCF85063ATL Real-time Clock (I2C)
• Haptic vibration motor
• TF card slot for storage expansion
• Deep sleep current: 2.77 µA

Product Parameters

Feature	Specification
MCU	ESP32-S3FH4R2 @ Dual-core LX7, 240 MHz
Flash	4 MB
PSRAM	2 MB (OPI PSRAM)
Wi-Fi	2.4 GHz 802.11 b/g/n
Bluetooth	Bluetooth 5.0
LoRa	SX1262 (868/915 MHz) or SX1280 (2.4 GHz)
Speaker	MAX98357A (I2S)
Microphone V1.0	MSM261S4030H0R (I2S)
Microphone V1.1	MP34DT05-A (PDM)
RTC	PCF85063ATL (I2C)
Vibration	Haptic motor
Storage	TF card slot
USB	1 × Type-C
Power Input	5 V / 500 mA
Mounting Holes	2 × M2
Dimensions	66 × 27 × 15 mm

Pin Diagram

Speaker (MAX98357A)

Signal	GPIO
BCLK	40
LRCLK	41
DATA	39
SD_MODE	38

Microphone — V1.0 (MSM261S4030H0R, I2S)

Signal	GPIO
BCLK	47
WS	15
DATA	48
EN	35

Microphone — V1.1 (MP34DT05-A, PDM)

Signal	GPIO
LRCLK	15
DATA	48
EN	35

Vibration Motor

Signal	GPIO
DATA	46

RTC (PCF85063ATL)

Signal	GPIO
SDA	42
SCL	45
INT	16

SX126x (SX1262)

Signal	GPIO
CS	7
RST	8
SCLK	5
MOSI	6
MISO	3
DIO1	33
BUSY	34

SX127x

Signal	GPIO
CS	7
RST	8
SCLK	5
MOSI	6
MISO	3
DIO0	9
DIO1	33
DIO2	34
DIO3	21
DIO4	10
DIO5	36

SX128x (SX1280)

Signal	GPIO
CS	7
RST	8
SCLK	5
MOSI	6
MISO	3
DIO1	9
BUSY	36
TX	10
RX	21

Dimension Diagram

Schematic

• T3-S3-MVSRBoard V1.0 Schematic

Datasheet

• MAX98357A Datasheet
• MP34DT05-A Datasheet
• MSM261S4030H0R Datasheet
• PCF85063ATL Datasheet
• ESP32-S3 Datasheet

Software Development

• T3-S3-MVSRBoard GitHub Repository

Dependent Libraries

• Arduino_DriveBus
• RadioLib
• ESP8266Audio

FAQ

• Q. How to adjust the external antenna resistor? A. Refer to the image below for resistor direction adjustment:

• Q. What's the difference between SX1262 and SX1280 versions? A. SX1262 supports 868/915 MHz using FSK modulation; SX1280 supports 2.4 GHz using LoRa modulation.

• Q. Which audio formats are supported? A. Supports WAV, MP3, and other common audio formats (with software decoding libraries).

• Q. What is the LoRa voice communication range? A. Under ideal conditions, voice communication range can reach several kilometers, depending on environment and antenna.

• Q. Does it support real-time voice transmission? A. Yes — supports real-time voice acquisition, compression, and LoRa transmission for walkie-talkie functionality.

Version History

Version	Release Date	Update Description
T3-S3-MVSRBoard_V1.0	2024-11-06	Initial version
T3-S3-MVSRBoard_V1.1	2025-03-18	Changed microphone to MP34DT05-A (PDM)

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Related Tests

Power Consumption

Mode	Minimum Current
Deep Sleep	2.77 µA

Audio Performance

Parameter	Specification
Sample Rate	8–48 kHz
Bit Depth	16-bit
Signal-to-Noise Ratio	>90 dB