In depth comparison of the 3 mostly used mmwave sensors for Home Assistant. The SEN0395 from DFROBOT, the LD1115H from Hi-link and the LD2410B as well from Hi-link.
All 3 sensors are 24GHz millimetre-wave radar sensor. All 3 uses a GPIO pin as a sensor as well as UART to interact with the board.
The SEN0395 and the LD2410B support distance detection as well as sensibility, the LD2410B has also Bluetooth so that can be also adjusted and controlled via a mobile app.
The LD1115H on the other hand only support changing the sensibility.
The SEN0395 from DFROBOT, this sensor senses the human presence, stationery, and moving people within the detection range of maximum 9m. This 24GHz millimetre-wave radar sensor that has separate transmitter and receiver antennas.
It has a transmit power range between 13 to 15 decibel-milliwatts, its 28 cm by 24 cm, operating temperature range for this sensor is -40 degrees Celsius up to 85 degrees Celsius, the default UART baud rate is 9600 and it has 6 pins.
To connect this, you can simply use the V, G and IO2, but if you also want to interact with the sensor and change the values also for debugging purposes, you will also need to connect the TX and TX pins.
The LD1115H it’s a high sensitivity 24GHz mmwave sensor that can detect movement to up to 4 m and up to 16 m movement, This sensor its about 2.5mm x 2.5mm in size, the default UART baud_rate is 115200, data_bits: 8, stop_bits: 1, parity: NONE and has 5 pins
When the radar detects a large motion, it will output mov,a small number that represents the spectral line and the another number that represents the signal strength. If the value changes from mov to occ, then it detects a static object, the rest of the values are the same as the movement.
The LD2410B is a high-sensitivity 24GHz human presence radar with a distance detection of up to 6 meters when the detection resolution is 0.75 or uo do 1.6 meters when the detection resolution is 0.2. Its 7mmx35mm the pin hole diameter is 0.6mm, and the pin spacing is 1.27mm so smaller than the normal, so I recommend buying the version without the header. It has 5 pins as well VCC 5V, Ground, RX, TX and OUT. The out pin is low when there is no presence detected and hight when there is presence.
The power supply voltage of the module is 5V, and the power supply capacity of the power supply is required to be greater than 200mA.
