mmWave-C4001 24Ghz Human Presence Detection Sensor

mmWave-C4001 24Ghz Human Presence Detection Sensor Documentation

Overview

The mmWave-C4001 is a 24 GHz human presence detection sensor that uses mmWave technology to detect and track the presence of humans in a specific area. It is a highly accurate and reliable sensor suitable for various IoT applications, including smart homes, security systems, and industrial automation.

Technical Specifications

Frequency: 24 GHz
 Range: Up to 10 meters
 Accuracy: 1 cm
 Power supply: 3.3 V - 5 V
 Communication interface: UART, I2C, or SPI
 Operating temperature: -20C to 70C

Pinout

The mmWave-C4001 has a 12-pin interface with the following pinout:

| Pin | Function |
| --- | --- |
| 1 | VCC (3.3 V - 5 V) |
| 2 | GND |
| 3 | TX (UART) |
| 4 | RX (UART) |
| 5 | SCL (I2C) |
| 6 | SDA (I2C) |
| 7 | SCK (SPI) |
| 8 | MOSI (SPI) |
| 9 | MISO (SPI) |
| 10 | CS (SPI) |
| 11 | Interrupt |
| 12 | Reset |

Code Examples

### Example 1: Using the mmWave-C4001 with an Arduino Board (UART Interface)

In this example, we will use an Arduino Uno board to communicate with the mmWave-C4001 sensor using the UART interface.
```c++
#include <SoftwareSerial.h>

#define RX_PIN 2  // RX pin of the mmWave-C4001
#define TX_PIN 3  // TX pin of the mmWave-C4001

SoftwareSerial mmWaveSerial(RX_PIN, TX_PIN);

void setup() {
  Serial.begin(9600);
  mmWaveSerial.begin(115200);
}

void loop() {
  mmWaveSerial.write("AT+ GetData");
  delay(100);
  String data = mmWaveSerial.readStringUntil('
');
  int distance = data.substring(12, 15).toInt();
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(500);
}
```
### Example 2: Using the mmWave-C4001 with a Raspberry Pi (I2C Interface)

In this example, we will use a Raspberry Pi to communicate with the mmWave-C4001 sensor using the I2C interface.
```python
import smbus

bus = smbus.SMBus(1)  // I2C bus number

mmWaveAddress = 0x1A  // I2C address of the mmWave-C4001

def get-distance():
  data = bus.read_i2c_block_data(mmWaveAddress, 0x00, 6)
  distance = (data[3] << 8) + data[4]
  return distance

while True:
  distance = get_distance()
  print("Distance: ", distance, "cm")
  time.sleep(0.5)
```
### Example 3: Using the mmWave-C4001 with an ESP32 Board (SPI Interface)

In this example, we will use an ESP32 board to communicate with the mmWave-C4001 sensor using the SPI interface.
```c++
#include <SPI.h>

#define SPI_CS 5  // CS pin of the mmWave-C4001
#define SPI_CLK 18  // CLK pin of the mmWave-C4001
#define SPI_MOSI 23  // MOSI pin of the mmWave-C4001
#define SPI_MISO 19  // MISO pin of the mmWave-C4001

SPI spi;

void setup() {
  spi.begin(SPI_CS, SPI_CLK, SPI_MOSI, SPI_MISO);
  Serial.begin(115200);
}

void loop() {
  spi.transfer("AT+ GetData");
  delay(100);
  uint8_t data[6];
  spi.transfer(data, 6);
  int distance = (data[3] << 8) + data[4];
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(500);
}
```
Note: In all examples, make sure to connect the mmWave-C4001 to the corresponding pins on the development board, and ensure that the power supply voltage and communication interface match the sensor's specifications.