With the continuous warming of the Internet of Things concept, create a comfortable smart home environment, but more than just stay in the concept, more market responses are more constant with various novel smart home products. As an electronic loveman, I have also played a lot of interesting smart homes, such as smart sockets, smart light bulbs, smart remote controls, etc. If they experience alone, they feel still, but if they are put together, then they will feel too Trouble. Because this product is affiliated with different manufacturers, you need to install a specific app for each product. Over time, it will inevitably feel that the operation is cumbersome, and it has not experienced the pleasure of smart home, so these respective smart home products The experience gives a human experience is usually just "three minutes" heat, and the final result is to start with curiosity to end.
Don't you have a complete set of smart home product solutions, can you let users control the control of various smart products? The answer is of course negative! Recently, I loved the board, I got a Wulian smart home suit product, which included multiple products (but not limited to the these fews we got): a gateway, an infrared repeater, a temperature and humidity detector, a tape measure Sockets, only one app, you can implement the control of these products. As shown below:
In most users' cognks, the current single smart home product usually uses WiFi or BLE as the core communication technology, with the APP application of the smartphone, and the operation is also very simple, but in the overall solution, particularly involve multiple products Control, the network of nodes (like this Wulian Smart Home Set), the shortcomings of these two communication methods are exposed, the WiFi connection time, the BLE support node is small, the transmission distance is short, and ZigBee technology is low power consumption , Low cost, support nodes, etc. It is just that the role is played.
Experience
Although this article is mainly dismantled to this suit, the author is really impossible to have a temptation, and it has actually experienced it. It will also let the majority of netizens open their eyes.
To be honest, the use of Wulian Smart Home Set is very simple, its principle is bound to the gateway through the ZigBee Communication Protocol, and then remotely control each product remotely via the mobile client. In order to facilitate everyone to watch, it is temporarily presented in a place. In actual use, users can place each product in the location you want to place according to their own needs.
The most important step in use is to configure the binding of each product and gateway. This step can be used when the gateway enters the configuration ZigBee state, can be used by the configuration button of each product under the combo 4, and the specific operation can refer to the use of the product. It will not be detailed here.
The APP of the mobile phone can be downloaded by scanning the QR code on the box. When you open the app, you need to simply register, the most surprised the app home, the Wulian and Atmel reached an intelligent home strategic cooperation agreement.
The words retired, the author tried the functions of these products (infrared forwarders, temperature and humidity detectors, metering sockets), and the effect is very nice. You can view the binding devices in the app of the app. After entering, you can Control. Interested friends can consider buying a set of fun, here is not explained, we focus on dismantling. (Next)
Dismantle
Because this Wulian smart home package is more, we will dismantle according to the order of the gateway, the infrared repeater, the temperature and humidity detector, the metering socket.
WL gateway 02 type
WL gateway looks very similar to the current network TV box, the shape is also in the rules, which is square, and the two sides of the box are the LED indicator and the layout of the interface and button function, as shown below.
For such product disassembly, the author is still some experience, remove the panel on the LED indicator side, you can see the screw hidden below, then remove it, open the cover. Take a closer look, the layout of the PCB board is still very empty, and it looks like, the device of the board is almost distributed on the front.
Sure enough, take out the PCB board of the WL gateway, basically see some passive blocking electronic components on the back of the board.
Throughout the WL gateway card, the two main circuits of the board are:
Single-chip routing scheme based on RALINK RT5350F
ZigBee solution based on Ti CC2530 + RFAXIS RFX2401C
Ralink RT5350F (as shown below) is an early routing single-chip SOC solution, supporting IEEE802.11n, single-issuing single, internal integration, LNA, I really want to say, this and our previously evaluated a smart The router AR9331 SOC function is similar, but the amount of heat of RT5350F will be relatively high, but the price will be cheaper, but for products that have no interrupt work a day, I stand at the perspective of consumers, I'm not recommended. This program is. (Next)
But for this Wulian smart home suit, let the author interested or its ZigBee technology solution, we have focused on it.
It can be seen that Wulian smart home uses the solution of Ti CC2530 Zigbee Soc + RFAXIS RFX2401c.
TI CC2530 is a familiar ZigBee single-chip SOC solution, which uses a lot of manufacturers, using QFN40 small package, only 6mm * 6mm size, internal integration of RF transceivers and an enhanced 8051 kernel, support IEEE802 . 15.4, as shown in the figure above, the external circuit can make a complete circuit, and the system block diagram of the CC2530 is as follows:
In addition to having a rich peripheral resource, the CC2530 has very low power consumption, and the specific parameters are as follows:
Active mode RX (CPU idle): 24 ma
Active mode TX in 1DBM (CPU idle): 29mA
Power Mode1 (4 μs wakeup): 0.2 ma
Power Mode2 (sleep timer running): 1 μA
Power Mode3 (external interrupt): 0.4 μA
Wide supply voltage range (2 V-3.6 V)
If only a single-chip solution of a CC2530, that's the same, the author will definitely not describe the pen. However, the designer is obviously still very useful, from the actual application perspective of WL gateway products, take into account better communication quality between the nodes, to make greater space as much as possible in communication distance, for this Considering that if an analog front end (amplifying circuit) is added to the CC2530 circuit, it will be better, but this is difficult, and the cost will also increase accordingly. How to choose a suitable analog front-end chip?
RFAXIS RFX2401C
If you want to install a large circuit in the CC2530, I believe that many people will learn the combination of Ti's full set of solutions CC2530 + CC2591, but believe that people who have used this program have an impression, and there are too many peripheral components of CC2591, and the parameters are very Difficulties, if there is no experience, the final effect may be poor, even there is no separate CC2530. Let's go back to the PCB board of the WL gateway. You will find that the front-end circuit is so simple, and the hero is this RFAXIS RFX2401C! Look at the design ideas below, in addition to matching circuit, only a few bypass capacitors are required, the circuit design is very simple, convenient, and for entrepreneurial companies that do not have expensive RF instruments, RFAXIS RFX2401C is definitely an ideal front-end chip for the ZigBee circuit.
From the specification of RFAXIS RFX2401C, this is an ultra-high integration RF front-end chip, which uses ultra-small QFN-16 packages, only 3mm * 3mm size, integrated including LNA, PA, Transceiver switch circuit. , Matching network, harmonic filter, etc., externally only a small amount of electronic components can form a complete system, some specific parameter characteristics of RFAXIS RFX2401C can refer to the official Datasheet.
WL single-headed infrared repeater
Let's take a look at the dismantling of several other products. The dismantling of the infrared repeater is more simple. Look at this structure design, it can be said to be the "most primitive", which is probably the function is functional and the appearance needs concept. (Next)
The dismantling is completely free to blow the ash, screw the two triangular screws on the back.
Relatively, the circuit of the infrared repeater is relatively simple, and the ZigBee module of the CC2530 is also used, but the RFAXIS RFX2401CRF front-end chip is not included.
The other side of the board is an infrared transmitter and a receiver.
Temperature and humidity monitor
The temperature and humidity sensor and the infrared repeater are similar, and the circuit is also very simple. After reading the construction of the infrared repeater, I believe that everyone can imagine what the temperature can be imagined inside the temperature and humidity monitor.
Also, the ZigBee module of Ti CC2530.
The back is a temperature and humidity sensor, and the circuit is very simple, there is nothing more. (Next)
Wireless mobile socket (meter)
Let's take a look at the last product in the Wulian Smart Set. Wireless mobile socket. Compared with the two infrared repeater and temperature and humidity monitor products, the quality of the wireless mobile socket is more reliable, it seems that the products of the power supply class, each manufacturer still pays great attention to quality.
The wireless mobile outlet itself has a power on-off switch, very user-friendly design. For example, if you want to turn off the power next to your socket, you don't have to turn it off again. If you don't have to turn it on, do it, you can press it.
The unplugging the socket first can see the protection device on the plug hole, prevent children from being mistaken, consider very week.
The ZigBee communication scheme of the socket is still a CC2530 of Ti, and the conduction of the socket is achieved through Omron's 5V relay.
It is worth mentioning that the wireless mobile socket has a power metering chip that uses the micro-core MCP3905A electrical energy measurement chip, which is a product that can be used as a low-cost meter solution. After reading the dismantling, we can probably get the hardware system of the entire smart home set, as shown in the following figure.
From simple use to disassembly, the Wulian smart suit gives us more than just technology to change the convenience of life, but also a context of wireless communication technology. Today, WiFi, BLE is considered two major super vectors to support wireless communication transmission of intelligent hardware, and ZigBee seems to be in "Japan Xishan", slowly walking down the slope, however, this Wulian smart suit Experience, dismantling let us see the potential of Zigbee, in the entire home system control, ZigBee has played a good low cost, networking advantage, and the solution of CC2530 + RFAXIS RFX2401C has effectively added Zigbee Communication distance, perfect release of ZigBee technology, RFAXIS's RFX2401C RF front chip is very simple to make circuit design through the functions of PA, LNA, transceiver switch circuit, matching network, harmonic filter, etc., only a small amount The external electronic components can be easily competent, and the engineers in this area may wish to pay more attention.
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