### 433MHz RF transcievers

Posted:

**Tue Nov 21, 2017 8:06 am**I received these modules yesterday and as simple as they are, they do work. Kind of! Well, not exactly as I expected them to.

https://www.aliexpress.com/store/produc ... 51712.html

Receiver module parameters

1.Product Model: MX-05V

2.Operating voltage: DC5V

3.Quiescent Current: 4mA

4.Receiving frequency: 433.92MHZ

5.Receiver sensitivity:-105DB

6.Size: 30 * 14 * 7mm

7.External antenna: 32CM single core wire, wound into a spiral

Technical parameters of the transmitter head

1.Product Model: MX-FS-03V

2.Launch distance :20-200 meters (different voltage, different results)

3.Operating voltage :3.5-12V

4.Dimensions: 19 * 19mm

5.Operating mode: AM

6.Transfer rate: 4KB / S

7.Transmitting power: 10mW

8.Transmitting frequency: 433M

9.An external antenna: 25cm ordinary multi-core or single-core line

10.Pinout from left → right: (DATA; VCC; GND)

The problem is, the maximum "ON" state of the DATA is 100ms. I was hoping this would not be limited, and I could transmit a continuous "1".

Now I don't really know how to implement a simple presence detection.

https://www.aliexpress.com/store/produc ... 51712.html

Specs:

Receiver module parameters

1.Product Model: MX-05V

2.Operating voltage: DC5V

3.Quiescent Current: 4mA

4.Receiving frequency: 433.92MHZ

5.Receiver sensitivity:-105DB

6.Size: 30 * 14 * 7mm

7.External antenna: 32CM single core wire, wound into a spiral

Technical parameters of the transmitter head

1.Product Model: MX-FS-03V

2.Launch distance :20-200 meters (different voltage, different results)

3.Operating voltage :3.5-12V

4.Dimensions: 19 * 19mm

5.Operating mode: AM

6.Transfer rate: 4KB / S

7.Transmitting power: 10mW

8.Transmitting frequency: 433M

9.An external antenna: 25cm ordinary multi-core or single-core line

10.Pinout from left → right: (DATA; VCC; GND)

The problem is, the maximum "ON" state of the DATA is 100ms. I was hoping this would not be limited, and I could transmit a continuous "1".

Now I don't really know how to implement a simple presence detection.