Vajravolt AI IoT 4G LTE Industrial Gateway Board (VVM701)
AI-enabled industrial IoT gateway with ESP32-S3, 4G LTE, GPS, isolated RS485/RS232, analog/digital inputs, relays, SD/SIM support, and optional Ethernet, LCD, c
WIZnet - W5500
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All-in-one industrial IoT platform: Vajravegha Mobility's VVM701 integrates ESP32-S3, 4G LTE, GNSS, industrial I/O, and optional W5500 Ethernet—designed for automation, data acquisition, and edge AI applications.
📦 Product Information
| Item | Details |
|---|---|
| Model | VVM701 v1.1 |
| Manufacturer | Vajravegha Mobility Pvt Ltd (Mumbai, India) |
| PCB Size | 130 × 105 mm |
| Power | 9–30V DC |
🔧 Core Features
Main Components
| Component | Specification |
|---|---|
| MCU | ESP32-S3 WROOM-1 (240MHz, 16MB Flash, 8MB PSRAM) |
| Cellular | Quectel EC200U-CN 4G LTE Cat 1 (10Mbps) |
| GNSS | Built-in GPS positioning |
| Wireless | Wi-Fi + Bluetooth 5 |
| RTC | DS3231 (I2C) |
Industrial I/O
| Feature | Specification |
|---|---|
| Analog Inputs | 5 ch, 12-bit (4–20mA / 0–5V) |
| Digital Inputs | 4 ch isolated (up to 24V) |
| Relay Outputs | 2 ch (30V DC / 2A) |
| Serial | Isolated RS485/RS232 (jumper selectable) |
| Storage | Micro SD card + Nano SIM slot |
| USB | Type-B (programming/monitoring) |
Protocols
MQTT(s), HTTP(s), DHCP, FTP, Modbus RTU/TCP, SPI, I2C, FOTA
🔌 Optional Expansions (Not Mounted)
| Module | Purpose | Interface |
|---|---|---|
| W5500 Ethernet | Wired network / Modbus TCP | SPI (CS: GPIO21) |
| 2.4" TFT LCD | 240×320 touchscreen HMI | SPI |
| Camera | OV2640/OV7670 for AI vision | SCCB |
| INMP441 Mic | I2S audio/voice activation | I2S |
| RFM95W LoRa | Long-range wireless | SPI |
| I2C Sensors | MPU6050, EEPROM, etc. | I2C |
| CAN | TJA1050/TJA1051 transceiver | UART1 |
📊 Key GPIO Mapping
| Peripheral | Pins | Notes |
|---|---|---|
| 4G Module | TX:41, RX:40, PWRKEY:42 | |
| Standard SPI | MOSI:11, MISO:13, CLK:12 | Shared: W5500/LCD/LoRa |
| SD Card | MISO:38, MOSI:47, CLK:39, CS:48 | HSPI |
| RS485/RS232/CAN | TX:1, RX:2 | Jumper selectable |
| I2C (RTC/Sensors) | SCL:4, SDA:5 | |
| W5500 | CS:21 | + standard SPI |
| Status LED | GPIO:18 |
Caution: Strapping pins (0, 3, 45, 46) and PSRAM pins (35, 36, 37)—use carefully.
🚀 Quick Setup
- Connect: 4G antenna, SIM card, optional SD card
- Power: 9–30V DC supply
- Wi-Fi: Create hotspot
iotgateway/ passwordiot@1234 - Access: Browse to
iotgateway.local - Program: USB connection, Arduino IDE (ESP32S3 Dev, enable "USB CDC on Boot")
LED Status:
- Slow flicker: Searching network
- Quick flicker: Connected (idle)
- Rapid flicker: Data transfer
🎯 Why W5500 Matters
Industrial Connectivity
W5500 adds:
- Hardware TCP/IP (zero MCU overhead)
- Wired Ethernet reliability
- Modbus TCP/IP gateway capability
Multi-Path Architecture:
4G LTE ──┐
Wi-Fi ──┼──> VVM701 ──> Industrial Systems
Ethernet──┘ (W5500)Key Applications
- Modbus Gateway: RS485 RTU ↔ Ethernet TCP
- Factory Automation: PLC monitoring + cloud streaming
- Edge AI: Camera vision + network results delivery
- Remote Monitoring: Multi-sensor data logging
📚 Resources
- GitHub: github.com/vajravegha/vajravolt
- Support: info@vv-mobility.com / +91 88506 27350
- Website: vv-mobility.com
⚠️ Important Notes
- Programming: Understand EC200U AT commands before reprogramming
- No voice calls: Board lacks speaker/microphone
- Arduino IDE: Always enable "USB CDC on Boot"
- I2C conflict: MPU6050 (0x68) conflicts with RTC—change to 0x69
- Serial select: Only one of RS485/RS232/CAN active at a time
Conclusion
VVM701 consolidates ESP32-S3, 4G LTE, industrial I/O, and optional W5500 Ethernet into a single board—ideal for:
✅ Industrial automation and Modbus gateways
✅ Edge AI with camera/microphone
✅ Multi-connectivity (cellular/Wi-Fi/Ethernet)
✅ Data acquisition and remote monitoring
W5500 integration provides hardware TCP/IP offloading and wired reliability—transforming VVM701 into a professional-grade industrial IoT platform. Made in India by Vajravegha Mobility.