beweging sensor Radar Zigbee 230V Tuya Smart Life Home 5.8G

New price 23 euro per piece (i have 2 pieces)
his model is labelled as MTG075-ZB-RL by the manufacturer and identified as _TZE204_dtzziy1e within the Tuya ecosystem, available with both 5.8GHz and 24Ghz radar sensors inside. I’m testing the 24GHz radar variant,

Technical Specification

Model: MTG075-ZB-RL
Manufacturer ID: _TZE204_dtzziy1e
Connectivity: ZigBee
Input: 85-240VAC.
Sensitivity: 1-9(default 7)
5.8G Beam Angle: 120X120°
24G Beam Angle: 110X110°
5.8G Sensing Distance: 0-11m(default 6m)
24G Sensing Distance: 2.5-10m(default 7m)
5.8G Sensing Radius: 2.5-3m(Presence), 4～5.5m(motion).
24G Sensing Radius: 2-3m(Presence), 4～4.5m(motion).
Illuminance Sensor: 0～500 Lux
Departure Delay: 0.5s～25 min
Transmitting Power: 3～5 dBm(5.8G), 10dBm(24G).
Working Temperature: -10°C~+50°C
Working Humidity: 5～90% RH(No Condensation).
Protection Level: IP20.
Relay Load: Resistive load≤3000W LED≤300W.
Size: ⌀105mm*28mm/⌀4.13inch*1.1inch

Difference between 5.8GHz vs 24GHz versions

This presence sensor is sold in both 5.8GHz and 24GHz radar variants. Even though 5.8GHz is technically microwave and not millimeter wave, it operates the same way 24GHz does.

It emits electromagnetic waves with the help of a transmitter which are reflected back to the sensor, a parameter known as the echo time. The receiver in the sensor then analyses the waves that are bounced back and the sensor is triggered/cleared. In summary:

24GHz has higher sensitivity
24GHz has more accurate departure delay (presence clearance) time. For example:
If you set the departure delay to 30sec on a 24GHz radar, the occupancy will be cleared after 30sec + 1-2 seconds.
If you set the departure delay to 30sec on a 5.8GHz radar, the occupancy will be cleared after 30sec + 5-8 seconds.
24GHz has higher recognition accuracy (less false triggers)
24GHz has shorter detection distance than 5.8GHz
5.8GHz is limited when used in metal containers (eg. elevators)

For the purpose of monitoring presence in a room, both versions will do a good job. However, I would go for the 24GHz sensor as it’s more powerful and can be fine-tuned better in terms of sensitivity and delay.
Teardown

The Tuya MTG075-ZB-RL came in a package with a user manual, a set of screws and a sticker for installation. The box was banged up as usual, but the device intact. No cables are included, as this is meant to go on your ceiling and mains powered (85-240VAC).
Tuya Zigbee 24G Presence Sensor MTG075-ZB-RL by manufacturer _TZE204_dtzziy1e Package Contents

The device has a very convenient shape for ceiling installation, it’s flat and thin which makes it look good once mounted in place. It does not require drilling a hole like the ZY-M100 did.

On the backside, some information about the device is printed between the two holes used for ceiling installation. The bigger hole on the bottom is where the cables go, so they are hidden from sight.
Tuya Zigbee 24G Presence Sensor MTG075-ZB-RL by manufacturer _TZE204_dtzziy1e Top Case
Tuya Zigbee 24G Presence Sensor MTG075-ZB-RL by manufacturer _TZE204_dtzziy1e Bottom Case

Opening up the device reveals all the components of the main PCB. Starting with the actual mmWave presence sensor in the middle, the communication module on one side and relay and terminals on the other.

The terminals are plastic push-in clips which grip the wire once released. Some people prefer these because they are fast to use and don’t have screws. I much prefer screw terminals, because once I install a wire I can be confident it won’t get loose.
Tuya Zigbee 24G Presence Sensor MTG075-ZB-RL by manufacturer _TZE204_dtzziy1e Open

The 16A relay used to control the lights (or anything that’s attached to it) is model HF32FV-16 [Datasheet] manufactured by Hongfa Technology in China. I’ve encountered a 10A version of this relay in the Aqara S1E Magic Switch.
Tuya Zigbee 24G Presence Sensor MTG075-ZB-RL by manufacturer _TZE204_dtzziy1e Relay Model

The actual mmWave radar sensor is labelled as model S3KM111L [Datasheet] manufacturer by ICLegend Micro, a company from Shenzhen in China, specializing in RF sensors.

According to the datasheet, this is a 24GHz capable sensor with 1GHz bandwidth modulation, specifically designed for the smart home industry with a secondary application in robotics and vital signs monitoring.
Tuya Zigbee 24G Presence Sensor MTG075-ZB-RL by manufacturer _TZE204_dtzziy1e mmWave Sensor

Communication is handled by a Tuya ZS3L Module [Datasheet], a chip I’ve encoutered many times when testing smart devices. More recently, I found it powers the Tuya ZS06 IR Blaster and Tuya PJ-MGW1203 Single Clamp Energy Meter.

This module is based on the latest gen EFR32MG21 [Datasheet] SoC by Silicon Labs, so I expect no communication issues and timely responses, which are crucial in a presence sensor.
Tuya Zigbee 24G Presence Sensor MTG075-ZB-RL by manufacturer _TZE204_dtzziy1e Tuya Module Zigbee
Installation and Wiring

This presence sensor is very simple to wire and install, the terminals are the same like in any smart switch. There are a total of 4 terminals, two for input (IN L+N) and two output (OUT L+N). Remove the top cap by twisting it sideways: