Shenzhen Xushida Technology RF2820 Wireless 433M Remote Control Instructions
- June 5, 2024
- Shenzhen Xushida Technology
Table of Contents
Wireless 433M Remote Control Instructions
RF2820 Wireless 433M Remote Control
- The code has 24 bits in total, BYTE0+BYTE1+BYTE2+end bit BYTE0, BYTE1 is the address code, the address code can be set to fixed address code FFFF, or other address values, or can be set to roll code, each remote control address code different. The rolling code can realize the one-to-one function, that is, one remote control only controls one receiving device. BYTE2 is the key code value, the code value of each key is fixed.
The following figure shows the key value of K1 = 01, and the address code is 20, 03
24-key 433 RF remote control code description
First row 01 02 03 04
Second row 05 06 07 08
Third row 09 0A 0B 0C
Fourth row 0D 0E 0F 10
Fifth row 11 12 13 14
Sixth row 15 16 17 18
Seventh row 19 1A 1B 1C
- There is a key combination, press the 14 and 18 keys at the same time to send CC, you can learn Learn key codes.
- The code value is hexadecimal, and the address code is different for each remote control, which can realize one The remote control controls a device without interfering with each other.
- If you don’t need a remote control to a receiving function, the receiving program can do It does not compare the address code, only the key code.
Receive and decode programming instructions
When the remote control does not send 433 signal, the wireless receiver chip
signal pin (DATA)
It’s irregular clutter, which is normal. When the remote control starts to
send 433 signal,
There will be a regular waveform on the receiving signal pin. Generally, the
receiving program detects the interval between each frame code.
The signal with an interval of 12MS, the decoding program enters and starts
decoding
When writing a decoding program, pay attention that the actual high-level time
is longer than the theoretical value.
It is shorter, and the high level time of each remote control will be
different, so I The high level time range we set should be as large as
possible.
0: 0.4MS+1.2MS is 0 when programming, the pulse width range of 0.4 should be
enlarged as much as possible, 0.4 The range is between 0.2-0.6
1: 1.2MS+0.4MS is 1 when programming, the pulse width range of 1.2 should be
enlarged as much as possible, 1.2 The range is between 0.8-1.4
Receive and decode to receive the 12MS interval time as the start signal, and
the 12MS signal interval time is regular.
FCC Caution
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Any changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates uses and
can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
The device has been evaluated to meet general RF exposure requirements. The device can be used in portable exposure conditions without restriction.
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