I want to know about wireless receiving groups and channels, about 433

一百年后的自己

I want to know about wireless receiving groups and channels, about 433 [Copy link]

 

How to use the content in the picture to receive signals wirelessly, six channels, 16 channels.

I have never been exposed to wireless reception, so I don't understand this knowledge point and can't write a program.

一百年后的自己

topwon

This should be the simplest ASK modulated 433MHz RF transmitter module.

maychang

Is this the communication protocol between the wireless receiving module and the host? Your program should have nothing to do with wireless receiving. The program only controls the wireless receiving module.

一百年后的自己

topwon posted on 2019-10-24 11:11 This should be the simplest ASK modulated 433MHz RF transmitter module.

I don't know the details, so I don't understand.

maychang

Myself 100 Years Later published on 2019-10-24 10:43

The only relationship between the part with red line frame and the module marked "433M" is that the part with red line frame provides power for the module, and whether the power is supplied is controlled by the signal marked RF-VC-CTR.

一百年后的自己

maychang posted on 2019-10-24 11:14 Is this the communication protocol between the wireless receiving module and the host? Your program should have nothing to do with wireless receiving. The program only controls the wireless receiving module.

It is a simple receiving module, using a channel to obtain a channel. I am not sure about the details. The teacher needs us to do this

一百年后的自己

maychang posted on 2019-10-24 11:17 The red-lined part has only a connection with the module marked "433M". The red-lined part is the power supply for the module. Whether it is powered...

It roughly means a remote control and the numbers displayed on the LCD of a single-chip microcomputer.

It is possible to use the remote control to control the LCD numbers.

一百年后的自己

maychang posted on 2019-10-24 11:17 The red-lined part has only a connection with the module marked "433M". The red-lined part is the power supply for the module. Whether it is powered...

maychang

Myself a hundred years later published on 2019-10-24 11:18 It is a simple receiving module, using a channel to obtain a channel. I am not sure about the details. The teacher needs us to do this

"I don't know the details. The teacher wants us to do this."

If you don't quite understand, then I have absolutely no idea.

maychang

Myself a hundred years later published on 2019-10-24 11:20 It roughly means a remote control, a number displayed on the LCD on a single-chip microcomputer. It means that the number of LCDs can be controlled by the remote control...

"It roughly means a remote control and a number displayed on the LCD of a single-chip computer. It means that the number on the LCD can be controlled by the remote control."

The signal sent by the remote control must be an encoded digital signal. In order for the microcontroller to display the signal sent by the remote control on the LCD, you must know how the remote control is encoded, and then you can use the microcontroller to decode it and send it to the LCD for display.

一百年后的自己

maychang posted on 2019-10-24 14:54 "It roughly means a remote control and the numbers displayed on the LCD on a single-chip microcomputer. It means that the numbers on the LCD can be controlled by the remote control & ...

Yes, that's what I mean. Use the remote control to control the numbers, and then synchronize them on the LCD.

I don't know how to write it. I have no idea.

maychang

Myself in a Hundred Years Posted on 2019-10-24 16:00 Yes, that's what I mean. I use the remote control to control the numbers, and then synchronize them on the LCD. I don't know how to program it, and I don't have any idea...

The first thing is to figure out how the signal received by your receiving module is encoded, as well as the output level of the receiving module and other parameters. Without knowing this, nothing else can be discussed.

Of course, you can also try them one by one, but I guess you don't have the time and energy for that.

一百年后的自己

maychang posted on 2019-10-24 16:37 The first thing is to figure out how the signal received by your receiving module is encoded, as well as the output level and other parameters of the receiving module. I don't know this...

I just don't understand how to write the receiving function and how to judge the high and low levels to achieve reception.

maychang

Myself a hundred years later posted on 2019-10-25 16:57 I just don’t understand how to write the receiving function and how to judge the high and low levels to achieve reception

Receiving wireless signals should not be the job of your program, but the job of the receiving module.

The receiving module receives the wireless signal and at least converts it into data that your microcontroller can recognize. The communication protocol mentioned in the first post stipulates the waveforms of the start code, data 0, and data 1, where the minimum time of high level or low level is 600us. As long as your microcontroller can recognize the length of high level and low level time, it can distinguish the start code, data 0, and data 1.

一百年后的自己

maychang posted on 2019-10-25 17:10 Receiving wireless signals should not be the work of your program, but the work of the receiving module. The receiving module receives wireless signals, at least...

I understand this, but I don't know how to write the program.

一百年后的自己

maychang posted on 2019-10-25 17:10 Receiving wireless signals should not be the work of your program, but the work of the receiving module. The receiving module receives wireless signals, at least...

Do you have such a case?

maychang

Myself in a Hundred Years Published on 2019-10-26 09:36 I understand this, but I don’t know how to write a program

“I understand this, too.”

That's easy.

You need to use a timer to generate an interrupt every 100us. You also need a four-byte (32-bit) buffer to store the received data, a 22-byte buffer to store the timer interrupt count, and a flag to indicate whether the current receiving state is waiting or has received the start code.

No matter the start code or the data code, it starts with the falling edge, so it is best to use an external interrupt pin for reception.

maychang

When an external interrupt occurs, first check the flag to determine whether the start code has been received. If the start code has been received, switch to the data receiving program. If the start code has not been received, it is the start code receiving program.

一百年后的自己

maychang posted on 2019-10-26 10:00 Myself a hundred years later posted on 2019-10-26 09:36 I understand this, but I don’t know how to write a program “I understand this too...

Now that you've said that, I'm still ashamed that I don't know how to write it. Do you have any similar code examples?