Complete pin assignments and GPIO configuration for Multiflexmeter 3.7.0.
Complete pin assignments and GPIO configuration for Multiflexmeter 3.7.0.
The Multiflexmeter supports two board variants with different pin assignments:
| Function | Pin | Description |
|---|
PIN_PERIF_PWR | 2 | Peripheral power control |
PIN_JSN_RX | 3 | JSN-SR04T ultrasonic sensor RX |
PIN_JSN_TX | 4 | JSN-SR04T ultrasonic sensor TX |
PIN_ONE_WIRE | 5 | OneWire bus (temperature sensors) |
PIN_DIO_2 | 6 | LoRa radio DIO2 interrupt |
PIN_DIO_1 | 7 | LoRa radio DIO1 interrupt |
PIN_DIO_0 | 8 | LoRa radio DIO0 interrupt |
PIN_RST | 9 | LoRa radio reset |
PIN_NSS | 10 | LoRa radio SPI chip select |
PIN_BUZZER | 17 | Buzzer output (Analog pin 3) |
| Function | Pin | Description |
|---|
PIN_DIO_4 | 1 | LoRa radio DIO4 interrupt |
PIN_DIO_0 | 2 | LoRa radio DIO0 interrupt |
PIN_DIO_1 | 3 | LoRa radio DIO1 interrupt |
PIN_DIO_2 | 4 | LoRa radio DIO2 interrupt |
PIN_JSN_TX | 10 | JSN-SR04T ultrasonic sensor TX |
PIN_JSN_RX | 11 | JSN-SR04T ultrasonic sensor RX |
PIN_ONE_WIRE | 12 | OneWire bus (temperature sensors) |
PIN_BUZZER | 17 | Buzzer output (Analog pin 3) |
PIN_PERIF_PWR | 20 | Peripheral power control |
PIN_NSS | 24 | LoRa radio SPI chip select |
PIN_RST | 25 | LoRa radio reset |
PIN_DIO_5 | 26 | LoRa radio DIO5 interrupt |
PIN_DIO_3 | 0 | LoRa radio DIO3 interrupt |
The LoRa radio module uses SPI communication with the following pin assignments:
| Function | mfm_v3 | mfm_v3_m1284p | Description |
|---|
| NSS (CS) | 10 | 24 | SPI Chip Select |
| MOSI | 11 | 11 | SPI Master Out Slave In |
| MISO | 12 | 12 | SPI Master In Slave Out |
| SCK | 13 | 13 | SPI Serial Clock |
| RST | 9 | 25 | Radio Reset (active low) |
| DIO0 | 8 | 2 | RX/TX Done interrupt |
| DIO1 | 7 | 3 | RX Timeout / FHSS interrupt |
| DIO2 | 6 | 4 | FHSS Change Channel |
| DIO3 | - | 0 | CAD Detection / PLL Lock |
| DIO4 | - | 1 | PLL Lock / Temperature |
| DIO5 | - | 26 | Mode Ready / CLK Output |
Standard I²C pins for sensor communication:
| ATmega Pin | Function | Notes |
|---|
| SDA | I²C Data | 4.7kΩ pull-up resistor |
| SCL | I²C Clock | 4.7kΩ pull-up resistor |
Default sensor address: 0x36
| Function | mfm_v3 | mfm_v3_m1284p | Description |
|---|
| TX | 4 | 10 | Trigger signal to sensor |
| RX | 3 | 11 | Echo signal from sensor |
| Function | mfm_v3 | mfm_v3_m1284p | Description |
|---|
| OneWire Bus | 5 | 12 | Dallas DS18B20 temperature sensors |
| Pin | Signal | Description |
|---|
| 1 | MISO | Master In Slave Out |
| 2 | VCC | +5V/3.3V |
| 3 | SCK | Serial Clock |
| 4 | MOSI | Master Out Slave In |
| 5 | RESET | Reset (active low) |
| 6 | GND | Ground |
| Pin | Signal | Description |
|---|
| 1 | GND | Ground |
| 2 | CTS | Clear To Send (not used) |
| 3 | VCC | Power output |
| 4 | TXD | UART transmit |
| 5 | RXD | UART receive |
| 6 | RTS | Request To Send (not used) |
The peripheral power control pin allows enabling/disabling external sensors:
| Function | mfm_v3 | mfm_v3_m1284p | Description |
|---|
| PERIF_PWR | 2 | 20 | Controls power to external sensors |