Easymeal ™ IoT MDB Router
SP32 based vending machine controller board with Ethernet, Wi-Fi, and 4G LTE connectivity
2
Components
Hardware components
WIZnet - W5500
x 1
Espressif - ESP32-WROOM-32E
x 1
Project description
- Designed for Easymeal ™
- Designed by PCBCrew ™
SP32 based vending machine controller board with Ethernet, Wi-Fi, and 4G LTE connectivity
| 3D Preview | PCBA |
|---|---|
 |  |
- ESP32-S3
- Wiznet W5500 Ethernet Controller
- Mini-PCIe connector for a Quectel/Simcom 4G LTE module
- RS232 UART port via push-pull connector
- Dual MDB connectors for vending macine interfacing
- On-board backup 18650 battery holder and charger
- DS1337 RTC and CR2032 battery holder
- DIP8 connector for 24Cxx EEPROM
- A few buttons and LEDs
- USB 2.0 Type-C connector for debugging
Pin Assignments
On-board peripherals
| Device | Net name | ESP32-S3 |
|---|---|---|
| Action LED | LED_ACT | GPIO_9 |
| Battery charger | BAT_CHARG | GPIO_8 |
| Pushbutton 1 | BTN1 | GPIO_37 |
| Pushbutton 2 | BTN2 | GPIO_36 |
| I2C SCL | SCL | GPIO_5 |
| I2C SDA | SDA | GPIO_4 |
MDB interface
| Device | Net name | ESP32-S3 |
|---|---|---|
| MDB 1 Tx | M1_TX | GPIO_16 |
| MDB 1 Rx | M1_RX | GPIO_15 |
| MDB 2 Tx | M2_TX | GPIO_18 |
| MDB 2 Rx | M2_RX | GPIO_17 |
W5500 Ethernet controller
| W5500 | Net name | ESP32-S3 |
|---|---|---|
| SCLK | SPI2_SCK | GPIO_12 |
| MOSI | SPI2_MOSI | GPIO_11 |
| MISO | SPI2_MISO | GPIO_13 |
| SCSn | SPI2_CS0 | GPIO_10 |
| RSTn | SPI2_RESET | GPIO_47 |
| INTn | SPI2_INT | GPIO_48 |
Quectel EC25
| Modem | PCIe | ESP32-S3 |
|---|---|---|
| MODEM_RST | PCIE_22 | GPIO_35 |
| MODEM_UART_TX | PCIE_13 | GPIO_44 |
| MODEM_UART_RX | PCIE_11 | GPIO_43 |
| MODEM_RTS | PCIE_25 | GPIO_39 |
| MODEM_CTS | PCIE_23 | GPIO_40 |
Simcom SIM7600
| Modem | PCIe | ESP32-S3 |
|---|---|---|
| MODEM_RST | PCIE_22 | GPIO_35 |
| MODEM_CTS | PCIE_11 | GPIO_43 |
| MODEM_RTS | PCIE_13 | GPIO_44 |
| MODEM_UART_TX | PCIE_19 | GPIO_41 |
| MODEM_UART_RX | PCIE_17 | GPIO_42 |
Project Ownership
This repository is hosted on PCBCrew Org for backup. The copyright of this hardware design is owned by Easymeal ™.
Sponsors:
