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      Frequently Asked Questions
How to do ESD Protection for RF Module Products in Hardware Design?

ESD protection design mainly refer to shell design, hardware design, PCB layout, component selection, software debugging, etc. In hardware design, an important method is to add ESD protection devices at key circuit nodes. For a wireless module with external antenna, the antenna interfaces need to be added

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What are Radio Frequency Bands and their Applications?

RF is the lowest portion in the electromagnetic spectrum familiar as a medium of analogue and modern digital wireless communication system. It spreads in the range between 3 KHz and 300 GHz, which include ELF, VLF, LF, MF, HF, VHF, UHF, SHF, EHF. It is a broad spectrum and many characteristic has not been experimented yet.

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What's the Difference Between SX1278/SX1276 Based Wireless Modules?

The wireless modules designed based on SX1278 and SX1276 chips has the advantages of long transmission distance and strong anti-jamming ability, which are widely used in various IoT fields. The performance of the two wireless modules are almost the same, the main difference is the frequency and the region targeted.

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Is the Higher Antenna Gain Always the Better?

We often get customer's inquiry and ask if we can provide a high gain antenna, someone even says the higher gain the better. But is that true? Is really higher gain antenna result a better effect? In fact, this view is incorrect. Simply to increase the gain, although the coverage distance is greater, the coverage will become narrower.

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Application of LoRa Module in Smart Meter Reading

Nowadays, the application of remote wireless transmission is increasing year by year, such as small amount of data between devices like water meters, smoke detectors, and the use of long-distance transmission. Let's take Smart Water Meter reading system as an example, to explain how LoRa module works in the AMR.

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Application of Radio Frequency in the Internet of Things

Just as the literal meaning of "IoT = Things + Internet", data transmission is required to connect to the Internet. The non-contact data transmission is the application scenario of radio frequency. Almost all IoT products will have RF transmission. The RF transmission with low transmit power has a short distance...

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What is the Receiving Sensitivity and How does it affect the Transmission Distance?

The receiving sensitivity is the minimum signal receiving power that the RF receiver can take out the useful signal correctly. The receiving sensitivity of wireless transmission is similar to people's hearing when they are communicating

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How Window/Door Sensor Works?

Door Sensor is composed of a wireless transmitter module and a magnetic block. There is a "reed switch" inside the wireless transmitter module. When the distance between the magnet and the reed switch is within 1.5cm, the reed switch is disconnected. Once the distance exceeds 1.5cm, it will alarm

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What are PIR Sensors and How they Work?

PIR Detector is a sensor that detects the movement of the heat source object. With the help of an optical system, it can detect the change of thermal radiation in a certain defense space. The PIR Detector converts the received change of IR heat radiation energy between the active human body and the background object into a corresponding electrical signal, and then alarms.

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What is the Most Real-Time IoT Applications Nowadays?

What is the most Real-Time IoT Applications? Smart medical, Smart Homes, Smart City, Intelligent Agriculture, Smart Industrial, Smart Supply Chain, Retail Purpose Applications, Smart Transportation, Smart Grid, Smart Wearables...

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How to choose the corresponding 433m wireless module

When it comes to the Internet of Things, we should all be familiar with the development of the Internet of Things today, and it is also gradually entering the field of the market. Slowly with the artificial intelligence, production machinery, no matter whether it is in our lives ...

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What is Switching Value RF Module?

Switching value signals is a digital signal. Compared with analog signal, it has strong anti-interference ability. The change of the switching value signal is not continuous, so it is so called pulse signal. If an RF module uses switching value signals to communicate, we call it Switching Value RF module.

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How to Choose a Suitable 2.4Ghz Wireless Module?

​The 2.4G wireless module works in the worldwide application-free ISM band. This band has relatively little interference, high frequency but weak penetration ability. These 2.4G RF Modules have a transmission distance of several dozen meters in an open air, which are widely used in smart home, consumer electronics, etc.

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How Bluetooth Module Works? M-B14001 BLE Module Introduction

How Bluetooth Module Works? Generally speaking, BLE module has four working modes: Master mode, Slave mode, Broadcast mode, and Mesh networking mode. Taking the Bluetooth module M-B14001 as an example. This module is a master-slave integrated Bluetooth Module, with UART interface for data transmission.

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Why Shall We Choose LoRa Module Even It Is More Expensive?

Why shall we choose LoRa Module even it is more expensive? According to its performance of transmission distance, power consumption, sensitivity, and anti-jamming ability, LoRa module is a good choice, epecially for small data transmission, even it is more expensive than the ordinary wireless modules!

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F.A.Q. for Wireless Bluetooth Modules

What is the difference between low power Bluetooth and normal Bluetooth? What is the transmission rate of BLE Bluetooth Module? What is the transmission rate of the BLE module? How much data can be transferred? Does the BLE module support 2.4G non-Bluetooth protocol mode?

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Which FSK Transceiver Module is better, Si4438 RF module or Si4463 RF module?

Both Si4438 and Si4463 are RF chips launched by Silicon Labs. The RF modules developed from these two chips have their own advantages and strengths. The performance of Si4463 RF module is far better than the Si4438 RF module. If cost is not a problem, the Si4463 RF module is definitely the best choice.

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What is the difference between SPI and UART communication?

Both SPI and UART are chip units that process and transmit data. However, SPI (Serial Peripheral Interface) is usually a 3 - 4 wire interface, which can send and receive independently and can be synchronized, while UART (Universal Asynchronous Receiver Transmitter) has only one input port and one output port, which completes two-way communication at the standard baud rate.

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How to Choose a Proper Wireless Module?

How to choose a proper wireless module? There are 5 steps to be taken when we selecting a wireless module from the Wireless Module Supplier! The specific steps include the following five aspects, which are specifically introduced by DreamLNK for your analysis.

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What is "Narrow Band Internet of Things" (NB-IoT)?

NB-IoT is an emerging technology in the field of IoT that supports cellular data connection of low-power devices over a wide area network (WAN), also known as a Low-power Wide Area Network (LPWAN). NB-IoT supports efficient connections to devices with long standby times and high network connectivity requirements.

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What is Standing Wave Ratio (SWR) in Radio Communication?

The Standing Wave Ratio (SWR), also known as VSWR, which is short for Voltage Standing Wave Ratio. The SWR (VSWR) is a numeric value used to indicate whether the antenna and the RF transmitter matches well. The SWR is the basis for checking the efficiency of feeder transmission.

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Communication Principle of LoRa FHSS (Frequency-Hopping Spread Spectrum)

LoRa FHSS (Frequency-Hopping SpreadSpectrum) technology is used when a single packet time may exceed the maximum channel dwell time allowed by relevant regulations. Turn on hopping mode in LoRa by operating RegHopPeriod and FreqHoppingPeriod registers with non-zero values.

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System on a chip (SoC) module

An RF transceiver module incorporates both a transmitter and receiver. The circuit is typically designed for half-duplex operation, although full-duplex modules are available, typically at a higher cost due to the added complexity.

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Transceiver modules

An RF transceiver module incorporates both a transmitter and receiver. The circuit is typically designed for half-duplex operation, although full-duplex modules are available, typically at a higher cost due to the added complexity.

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Types of RF modules

The term RF module can be applied to many different types, shapes and sizes of small electronic sub assembly circuit board. It can also be applied to modules across a huge variation of functionality and capability. RF modules typically incorporate a printed circuit board, transmit or receive circuit

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Receiver modules

An RF receiver module receives the modulated RF signal, and demodulates it. There are two types of RF receiver modules: superheterodyne receivers and superregenerative receivers. Superregenerative modules are usually low cost and low power designs using a series of amplifiers to extract modulated da

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What is the Difference Between SMA Interface and SMB Interface?

We always see different coaxial connectors on the electronic devices, especially on its RF antenna or connecting cable, but do you know the difference between SMA interface and SMB interface? Both SMA and SMB are small coaxial connectors, but the SMA interface is threaded and the SMB interface is push in ...

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What is UUID Customization Function in Bluetooth Communication?

In BLE applications, UUID (Universal Unique Identifier) is always used to identify Bluetooth services and communication access attributes. Different Bluetooth services and attributes use different access methods, just like people's language communication, only the same language can communicate normally...

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Fixed Code and Learning Code in Wireless Remote Control

Difference between fixed code and learning code: the fixed code remote controller mainly adopts the coding chip of 2260 / 2262 / 2264, while the learning code remote control mainly uses the learning code chip 1527 / 2240 / 101; fixed code has higher repetition rate, and its encryption is also relatively poor...

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How should I recognize SMA Male and SMA Female heads?

How should I recognize SMA Male and SMA Female heads? There are many kinds of SMA connectors, one is called SMA, the other is RP-SMA. The difference between them is: the standard SMA is "inner thread + needle", "outer thread + hole"; while RP-SMA is "inner thread + hole", "outer thread + needle"

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What is SMA (SMA Connector)?

What is SMA (SMA Connector)? The full name of SMA is Small A Type, also known as SMA connector or SMA interface. It is a radio frequency and microwave connector that is widely used in telecommunication, networking, wireless communication, detection and measurement instruments.

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Why there is Communication Failure between Wireless Modules?

Why there is communication failure between wireless modules?With the development of the IoT, more and more devices will be connected to the network. A large number of them are wirelessly connected. The purpose of this article is to summarize the failure of wireless communication and the corresponding solutions

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What is Switching Value RF Transmitter/Receiver Module?

What is Switching Value RF Transmitter/Receiver Module? The switching value is the on-off signal, it is also called PLC switch value, which can be understood as pulse value. Switching Value RF Transmitter/Receiver Module is a device that can collect input/control output of switch signals (I/O signals)...

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What is LoRa? Where LORA Technology Can be Used?

What is LoRa? The full name of LoRa is ‘Long Range’, which has reflected the characteristics of this wireless technology from its full name – “wide coverage” (link budget of 168dB). It is a wireless technology that offers long range, low power and secure data transmission for M2M and IoT applications

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What is SPI and the Advantages of SPI Bus?

SPI is the abbreviation of “Serial Peripheral Interface”, which is a standard four-wire (SCLK, MISO, MOSI, SS) synchronous two-way serial bus. SPI interface was first defined by Motorola, and is mainly used between EEPROM, FLASH, real-time clock, AD converter, digital signal processor and digital signal decoder

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What is the Relationship Between the RF module and the MCU?

What is the relationship between the wireless RF module and the MCU, why some RF modules with MCU, and some modules without? Which role is the MCU plays in the RF module? Let’s learn this together!

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What is Tranparent Transmission and Tranparent Transmission Module?

Transparent transmission means the data forwarding device or wireless module is unconscious and no need to care, it just retransmit the signal/data. The Tranparent Transmission Module is a module that transmits data using the pass-through mode.

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What is dBm? What does it have to do with the power unit mW?

What is dBm? What does it have to do with the power unit mW? dBm means decibel milliwatt, full name in English is "decibel relative to one milliwatt", which refers to the absolute value of power. While db is a pure counting unit, representing a relative value, it must be the result of comparison...

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What is LoRaWAN? What is the Key Features of LoRaWan?

LoRaWAN is a Low Power, Wide Area networking protocol developed by the LoRa Alliance, it defines the end-to-end standard specifications for using LoRa technology, including Internet of Things market security, energy efficiency, roaming, and configuration on-boarding. It was originally called LoRaMAC...

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What is the RSSI Function of the Wireless RF Module?

What is the RSSI Function of the Wireless RF Module? Full name of RSSI is "Received Signal Strength Indication", it is an optional part of the wireless transmission layer, used to judge the link quality, and whether to increase the broadcast transmission strength.

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Three Different Ways of Communication (SPI, I2C, USART) Adopted on RF Modules

Generally, there are three different communication modes adopted on the RF modules, namely SPI (Serial Peripheral Interface), USART (Universal Synchronous/Asynchronous Receiver/Transmitter), I2C (Inter-Integrated Circuit)...

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Will 2.4G wireless module and BLE/Bluetooth module interfere with each other?

Will 2.4G wireless module and BLE module interfere with each other? The answer is "Yes". If we find that Bluetooth module and 2.4G wireless module interfere with each other, the best way is to stagger the frequency. In short, switch to an undisturbed frequency.

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Application Range of Common Used Radio Frequency (RF) Bands

Application Range of Common Used Radio Frequency (RF) Bands: NFC, FM, Antenna, Remote control, DVB, LoRa, RFID, NB-IOT, 2G, 3G, 4G, 5G, Bluetooth, WiFi...

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Difference Between Inching, Interlock and Self-Locking in RF Decoding

In order to meet the needs of different applications, the output modes of hardware decoding and receiving circuit are usually divided into Inching (M), Interlocking (L), and Self-locking (T). But what is the difference between Inching, Interlock and Self-Locking?

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What are the Regular Frequency Bands of Wireless Modules in Major Countries?

With the continuous progress of the Internet of Things (IoT)industry, wireless communication technology is also booming. What are the regular frequency bands of wireless modules in major countries? 2.4Ghz is worldwide frequency band; North America / UK / Japan / Korea is 915Mhz; EU is 863-868mhz, 433MHz is widely used in Asia and Middle East.

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What is RF Module (Radio-Frequency Module)?

An RF module (short for radio-frequency module) is (usually) a small electronic device used to transmit and/or receive radio signals between two devices. In an embedded system it is often desirable to communicate with another device wirelessly, include RF Receiving module & RF Transmitter module...

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Host microcontroller interface

RF modules typically communicate with an embedded system, such as a microcontroller or a microprocessor. The communication protocols include UART, used in Digi International's X-Bee modules, Serial Peripheral Interface Bus used in Anaren's AIR modules and Universal Serial Bus used in Roving Networks

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Which kind of wireless protocols are currently used on the RF modules

RF modules, especially SoC modules, are frequently used to communicate according to a pre-defined wireless standard, including: Zigbee, Bluetooth Low Energy (BLE), Wi-Fi, IEEE 802.15.4, Z-Wave, Wirepas,etc.However, RF modules also frequently communicate using proprietary protocols, and Wi-Fi, Blueto

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How IOT (Internet-of-Things) Works?

How IOT (Internet-of-Things) Works?The entire IOT process starts with the devices themselves like smartphones, smartwatches, electronic appliances like TV, Washing Machine which helps you to communicate with the IOT platform.Here, are four fundamental components of an IoT system:1) Sensors/Devices:

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Where are RF Modules been used?

RF modules are most often used in medium and low volume products for consumer applications such as garage door openers, wireless alarm or monitoring systems, industrial remote controls, smart sensor applications, and wireless home automation systems. They are sometimes used to replace older infrared

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