Category:Wireless

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Guide

Frequency

  • Very high frequency (VHF) - 30 MHz to 300 MHz
  • Ultra high frequency (UHF) - 300 MHz and 3 GHz
  • FSK - Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.
  • ASK - is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave
Main Header text Header text
315MHZ 310-320MHZ Radio ISM
433MHZ 425-440MHZ Radio ISM
- 470-862 MHZ DVB-T
800MHZ 824-896MHZ GSM 2G
900MHZ 896-960MHZ GSM 2G
1.2G 1150-1250MHZ
1.5G 1450-1550MHZ
1800MHZ 1710-1880MHZ GSM 2G
1900MHZ 1880-1990MHZ GSM 2G
3G 2010-2170MHZ
2.4G 2371-2500MHZ, 2400-2500 Wifi
4G 2575-2635MHZ

Compare Guide

IC Brand and Name Frequency Distance Modulation Feature
SX1276-78 semtech RFM95 Sub-1 GHz 10KM FSK, (GFSK, GMSK, MSK), and OOK Lora
SX1231 semtech RFM69/RFM22/RFM23 Sub-1 GHz 20dbm 800m FSK, GFSK, MSK, GMSK and OOK
SI4432 / Si4438 / Si4463 Silicon Labs Sub-1 GHz 1KM FSK, GFSK, and OOK
CC1101 TI Sub-1 GHz 2-FSK, 4-FSK, GFSK, and MSK supported as well as OOK and flexible ASK shaping
CC2530 / CC2500 TI Zigbee 2.4G 250M, 1.5KM
NRF905 nordicsemi Sub-1 GHz
NRF24L01 nordicsemi 2.4G 20-30M, 1KM
BK2461/BK2451 BEKEN 2.4G
A7105 AMICCOM 2.4G FSK/GFSK

RF Link Guide

  • MICRF213 - 3.3V, QwikRadio® 315MHz Receiver
Type Frequency Distance Modulation
RF433/315 - 2SC3356 SOT23 "R25"/2sc3357 - SOT89 "RF" 433/315 10m ASK/OOK
SYN480 + SYN115 ASK/OOK
LR670/680 + CS110/113 ASK/OOK
  • BH4126FV ?

RF Link (Encoder and Decoder)

  • ASK

Compare Guide

- Fixed-Code (Also called soldering code) Learning Code
Encode ICs PT2262 EV1527
Decoder PT2272 MCU, SK212, TCT6227/6228/6234, RH2762
Address Code tri-state (0, 1, NA) on 8 address pins (6561 unique addresses). 0 and 1 states on 20 bits (1048576 unique addresses)
Encoding hardware software
Address code type editable on hardware fixed during production
When lost encoder need to change hardware physically for decoding only need to re-learning the new address code

Coparision.png

  • Compare PT2262 and EV1527
  • PT2262 use A0-A11 for address code, and EV1527 use interal address code
  • Each IC EV1527 has gauranteed unique 1 million code possibility preprogrammed one time into it during manfacturing. The IC EV1527 gives much better result as compared to HT12E/PT2262 which are fixed code and does not need end user address configuration.
  • The IC EV1527 is called learning type since the receiver has to store its code before i can detect future packets. It gives better security.

Fixed Code

Use PT2262 Fixed Code

  • Customer must obtain the address code information from your device.
  • Set the jumper for A0 - A11, this is the address code that should match the decoder.

Learning Code

Use EV1527 Learning Code

  • Connect the battery for the sensors and power on (switch on).
  • Setting digital code for wireless sensors D0 - D3
  • Make sure your decoder is in programming status
  • Send the signal from encoder
  • The decoder will show successful status

Notice for Self-learning code

  • make sure the encoder and decoder in the same frequency, for example, 433Mhz or 315Mhz
  • make sure the oscillator resistor value must match both in encode and decoder, you can find the OSC resistor value on your PCB, and reference information on EV1527 datasheet.

Learning Code Decoder

  • SK212 has better performace
Rcswitch.png

Learning process
The code method: Press the learning key for 2 seconds, and the learning indicator light is on. At this time, it indicates that it is in the learning state. Release the learning key and press any key on the remote control for four times to indicate learning success and exit the learning mode.
Clear code method: Press and hold the custom key, the indicator light will always light, press and hold about 8 seconds after the indicator light goes off, that code has been cleared successfully.
Pin Output Mode

  • Point Mode - Pin output signal when singal received, and no output when no signal received.
  • Lock Mode - signal reverse when valid signal reverse
  • Inter-Lock Mode - singal out on relevant pin, the rest on signal pin keep off/low, also VT pin keep active/high when signal received.

Rolling Code

  • HCS300/301 Encoder
  • AN663 Decoder

RF Switch Receiver

  • Pin Definition: GND, VDD, D3, D2, D1, D0, (data pins),VT (wireless signal indicator), SW (external learning button), LED (external LED), GND, ANT (antenna)
  • learning process and locking mode please see "learning code" section above



Antenna

Type

Antenna Type: PCB, plastic rod/bar prismatical, metal spring, haptor

Type Gain Installation
433MHz Spring-Coil 1.5dBi External
GSM Rod Antenna 5CM 2dB External
GSM Rod Antenna 8CM 2.5-3dBi External
GSM PCB antenna 2dBi internal

Connections

Generally SMA, IPX, Pin spring connector

  • BNC
  • IPX, U.FL
  • SMA (outer thread, inner thread + female or male inside)
RPSMA = outer thread + male pin
SMA - KE = outer thread + female hole
SMA - KE = outer thread + male pin
  • TNC
RP-TNC = inner thread + female hole

Cable

  • RG179, RG316, RG174

Design

  • PCB antenna

Schematic


Reference

Datasheet

Documents

SYN470, SYN115

EV1527


Arduino Wireless Library

Pages in category "Wireless"

The following 13 pages are in this category, out of 13 total.