- 1 Guide
- 2 Protocols
- 3 RF Link (Encoder and Decoder)
- 4 Antenna
- 5 Schematic
- 6 Reference
- 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|
|915mhz - 902-928MHz||North America, UK, JP, KR||SX1286|
|868mhz - 863-868MHz||EU||SX1286|
|433Mhz or 470Mhz - 470~510Mhz||CN||SX1278|
In accordance with the transmission distance to divide the wireless technology, our common Internet of things technology can be divided into long-distance communication and close communication networking technology. Internet business needs huge, with a very obvious vertical industry characteristics is one of the current market concept of the popular. Internet of things based on business scenarios can be broken down into three cases.
- Fixed or slow wireless data access (local networking)
- Mobile wireless data access (mobile Internet)
- Pan-wireless data access (low-power wide-area networking)
If the transmission distance in accordance with the distance to divide wireless technology, our common Internet of things technology can be divided into long-distance communication and close communication networking technology, generally classified as follows:
Lora and similar
- China LoRa Application Alliance (CLAA) recommended 470 ~ 510MHz. The main frequency ranges in other areas are as follows:
- Europe 863 to 870
- North America 902 to 928
- the world's mainstream band is 800MHz and 900MHz. China Telecom will use 800MHz as the preferred band for deploying NB-IoT.
- China Unicom will choose 900MHz to deploy NB-IoT
- China Mobile may re-build the existing 900MHz band.
- The main frequency of NB-IoT on a global scale is shown in the following table:
- Europe, Middle East: 868MHz (ETSI 300220) 863 to 870
- North America: 902MHz (FCC part 15) 902 to 928
- South America / Australia / New Zealand: 920MHz (ANATEL 506, AS / NZS 4268).
- as an open standard LPWAN wireless technology, it works throughout the entire license-free Sub-GHz ISM / SRD band, which can be deployed globally: 169/433/470/780/868/915/923MHz.
Wi-Fi and Bluetooth Bluetooth, common deployment in the 2.4GHz ISM common frequency band, WIFI other standard and frequency can refer to the following table:
NFC (RFID) it is learned that the Ministry of Industry will be issued based on 13.56MHz near-field communication technology standards. Other areas of NFC and RFID bands refer to the following table:
- 125 kHz to 134 kHz
- 6.7 MHz
- 13.56 MHz (NFC)
- 27 MHz
- 433 MHz
- 865 MHz to 868 MHz (Europe)
- 902 MHz to 928 MHz (North America)
- 5.8 GHz
- 2.45 GHz
- 24.125 GHz
- operating frequency in China is 868.40 MHz, complying with ETSI / EN 300 220 standard.
ZigBee / Thread / 6LoWPAN (IEEE 802.15.4)/ ISA100.11a and other specifications
- Based on IEEE 802.15.4 to be extended, the general IEEE 802.15.4 device used by the frequency of 868/915 / 2400MHz. Specific frequency reference is as follows:
- 169.4 to 169.475 MHz
- 250 to 750 MHz
- 779 to 787 MHz
- 863 to 879 MHz
- 896 to 960 MHz
- 1427 to 1518 MHz
- 2360 to 2483.5 MHz
- 3244 to 4742 MHz
- 5944 to 10234 MHz
- ZigBee 3.0, Thread, 6LoWPAN
- 2360 to 2483.5 MHz
- To use 5V, connect 1K resistor to IO
|IC||Brand and Name||Frequency||TX||RX||Reference Distance||Modulation|
|RFM95 (SX1276, SX1278)||semtech||Sub 1GHz||-148dbm, -132dbm/0.81Kbps, 9.9mA||+20DBM 100mW||3KM||Lora|
|Si4463||Silicon Labs||Sub 1GHz||-126dbm, -120dbm/1Kbps, 13mA||+20DBM 100mW||2KM||GFSK|
|AX5043||ON||Sub 1GHz||-132dbm/0.6Kbps, 9.3mA||+17DBM||-|
|RFM69/RFM22/RFM23, RFM69HW (SX1231)||semtech||Sub 1GHz||+20DBM||1-2KM||GFSK ...|
|SI4432 / Si4438||Silicon Labs||Sub 1GHz||-124, -120dbm/1Kbps||+20DBM 100mW||1-2KM||GFSK ...|
|CC1101||TI||Sub 1GHz||GFSK ...|
|CC1125||TI||Sub 1GHz||-129dbm/300bps||+16DBM||GFSK ...|
|CC2530 / CC2500||TI Zigbee||2.4G||250M, 1.5KM|
|NRF24L01, NRF24L01+PA/LNA, NRF24L01-TW||-||2.4G||+7DBM, 40mA||0.1-1KM|
- CC1350 - World's First Dual-Band (Sub-1 GHz and 2.4 GHz)
RF Link Guide
- MICRF213 - 3.3V, QwikRadio® 315MHz Receiver
|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)
|-||Fixed-Code (Also called soldering code)||Learning Code|
|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)|
|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|
- 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.
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.
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
- Use normal RF433 Receiver can receive and decode learning code data, find RF433 item here.
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.
- 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: PCB, plastic rod/bar prismatical, metal spring, haptor
|GSM Rod Antenna 5CM||2dB||External|
|GSM Rod Antenna 8CM||2.5-3dBi||External|
|GSM PCB antenna||2dBi||internal|
Generally SMA, IPX, Pin spring connector
- 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
RP-TNC = inner thread + female hole
- RG179, RG316, RG174
- PCB antenna
- Use arduino to receive the code info of fixed code and learning code.