Undegent, the Raspberry School's Upgrade Version Raspberry Part 3B + is still as if it is approximately, although there is no use of the Raspberry Famous 4, there is no upgrade of the quality, there is no integrated AI element, but it is still worth a deep understanding. DIY platform. As the world's most popular open source hardware / single-board computer platform, it has been two years, and the Raspberry Pivot 3b + brings which upgrades, you know this article.
The author's hand is the e-belonging version of the Raspberry School 3B +, the packaging style is not big compared to the size and the Raspberry School 3b, so that the author will get the version of the Raspberry 3b in other regions of the Raspberry. . It is not clear that there is any other version of the Raspberry School 3B +, and RS should also be launched in accordance with past experience.
It is worth mentioning that the back of the box highlights the Raspberry 3B + two important upgrade features: stronger CPU performance and stronger wireless (WiFi / BT, WiF to support 5G band, and support BT 4.2 & ble) connection function However, is there only two upgrades? Continue to look down.
The internal accessories are as simple as ever, this time I don't know why, even a static electric bag is not.
The Raspberry School 3B + Lushan is true, and the past Raspberry Party can be seen from the past, unfamiliar with the Raspberry School 3B and Raspberry Pass, not familiar, it is almost silly. clear.
Look at the hardware of the Raspberry 3B + overall:
Boyong BCM2837B0 SOC, Integrated Quad-core ARM Cortex-A53 (ARMV8) 64-bit @ 1.4GHz CPU, Integrated Bo Tong VideoCore-IV GPU
Memory: 1GB LPDDR2 SDRAM
Wired network: Gigabit Ethernet (through USB2.0 channel, maximum throughput 300Mbps)
Wireless network: 2.4GHz and 5GHz dual-frequency Wi-Fi support 802.11b / g / n / ac
Bluetooth: Bluetooth 4.2 & low-power Bluetooth (BLE)
Storage: Micro-SD
Other interfaces: HDMI, 3.5mm analog audio video jack, 4X USB 2.0, Ethernet, camera serial interface (CSI), display serial interface (DSI), microSD card, 40PIN extension double pin pin
Size: 82mmx 56mmx 19.5mm, 50 grams
Core SOC upgrade
From the exterior, the Raspberry Pieces 3B + is basically unchanged, and the outer expansion module of the compatible barberry 3B can be used on the Raspberry Pieces 3b +, which is also a raspberry ecotropic circle is getting wider and wider. An important reason, how it is upgraded, and the interface that keeps a compatible with the previous generation is necessary. From the details, the change in Raspberry 3B is quite a lot. First of all, of course, the core unit of the onboard is BCM2837B0 SOC.
At a glance, you can see the change in the package, which uses a packaging of metal housing commonly used on Intel processors, which can effectively improve heat dissipation. From this feature, it is not difficult to speculate that the CPU performance of this SOC this SOC is definitely improved, and the fact is the fact that the 1.2GHz frequency of the original Raspberry 3b is upgraded to 1.4GHz. Of course, integration is still Cortex-A53, if it is changed to Cortex-A72 or Cortex-A73, it will be more popular.
Wi-Fi upgrade
The upgrade of the wireless network can be said to be in the reason, and it is very unexpected. In the author's view, this upgrade is much greater than the improvement of Boyong SoC.
Raspberry 3B + Upgrade Wi-Fi to 2.4GHz and 5GHz dual-band Wi-Fi, support 802.11b / g / n / ac. It is to know that there are currently the products of the Internet, especially smart home, because the price of the program is only used by the WiFi scheme of the 2.4GHz band, but the router that is now supported by the 5G band has been popular, and ordinary users are used to connect 5GHz WiFi In this way, many smart products have also need to switch to the frequency band of 2.4GHz, which is very troublesome. Smart home products like foreign countries Amazon Echo, Google Home, Apple HomePod support 5GHz WiFi band, so the author thinks that the Raspberry School 3B + support 5GHz frequency band WiFi is still very good, at least international product, need There is this kind of pursuit of the ultimate practice.
In addition, the Raspberry Part 3B + also supports Bluetooth to Bluetooth 4.2, although it is not like Apple's metamorphosis directly to support Bluetooth 5.0, but from many Bluetooth program products in China, Bluetooth 4.2 is currently a mainstream program.
If a careful classmate will find the change of the antenna of the wireless network, it has disappeared with the ceramic antenna of the user's vomiting antenna in the Raspberry Pass 3B, and the antenna of the Raspberry Zero W is replaced. Program.
It can be seen that a hollow treatment is made in the copper foil at the antenna location of the Raspberry Passenis, and there is a trapezoidal "hole-like", which looks a bit like a hairdryer's nozzle shape. The shaped portion, surrounded by via and several tiny capacitors, which constitutes a 2.4 GHz resonant cavity, driven through a capacitor, and the entire design consists of the antenna of the Raspberry 3B +, most importantly, In the previous love board, the evaluation of the Raspberry Pivot W Zero also confirmed that the performance of this antenna is indeed better than the ceramic antenna on the original Rober 3B, which is also a big surprise.
Ethernet upgrade
It is said that the Ethernet upgrade is a little general, in fact, it contains two parts of the upgrade, the first is the USB Ethernet controller upgrade on the board, before the use of USB extension 100M Ethernet, now the Raspberry 3b + is extended through the LAN7515 The Ethernet of Mago, the rate is greatly improved theoretical maximum throughput of 300MB / s.
The other part is the Ethernet supports the PoE (Ethernet power supply) interface (below), which can be directly powered for the Raspberry Paving 3B +. Of course, this requires this to support Ethernet HAT expansion modules, which can be purchased on the E support.
Power management upgrade
As we all know, it is possible to obtain some factors such as cost savings, and it is achieved by discrete devices, especially in the Raspberry Segment, and the USB interface is inverted. On the Raspberry Part 3B +, the model of MaxLinear is used for the MXL7704 power management IC. It can provide 5 output, providing 3.3V, 1.8V, 1.2V, VDD_CORE, etc., not only improves the reliability of the circuit. Sex, also simplifies the design of the circuit.
As for the raspberry 3b + other interface part, it is basically consistent with the inner Raspberry Pass 3, there is nothing more, look at the picture.
McIROUSB Power Supply Interface / HDMI Interface / CSI Interface / A / V Interface
Ethernet interface /usb2.0 interface
40pin extension double row pin
Power-on test
In addition to the function, I believe that everyone is the most concerned of the Raspberry Pivot 3B +, and the performance of the property is improved. This article will first test the Test situation of the Raspberry 3B + in sysbench under the basement performance, compared the in-the-generation Raspberry How much improvement in 3B is 3B.
The steps on how to burn the Raspbian system are no longer elaborated in this article, and the official and love board network have detailed tutorial guidance.
After burnt the official Raspbian system, you can see that the Raspberry 3B + maximum frequency does support 1.4GHz.
The performance of the Raspberry Pienuclear and 4-core is tested via sysbench.
Single nuclear test results:
4 nuclear test results:
Compared with the test comparison form of the Raspberry School 3B: (less time, the stronger performance)
However, it should be noted that the systems used by the two are officially provided Raspbian systems. This system has a disadvantage that is currently 32-bit, and it is impossible to play all the performance of Cortex-A53, but as contrast, under the same conditions. The result is still a reference.
summary
This book is just a simple experience of the Raspberry 3B +, and then the author will test according to the increased function point of the Raspberry 3B +, and even see the use of the Intel Movidius neural calculations. This article is written in the end, but I have to sigh, although the upgrade version of the Raspberry Pie is finally arrived as scheduled, but there is no some dead time for two years of expectation, there is still more regrets, such as the processing of ARM Cortex-A53. The memory is still only 1GB, and it is not possible to support USB3.0. There is no integration of hot AI elements. Now there is this feeling, the raspberry sect apple, all the upgrades with "+" belong to "add flowers on the brown", if already There is a partner of the Raspberry School, maybe we can wait, may only have the upgrade of the number code is the quality change, really want to look forward to the Raspberry Paving 4!
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