The Raspberry Pi Foundation is a small charity organization in the UK. Its purpose is to promote technology rather than sell technology for profit.

The foundation has never actually released a product in the past, so it chose two global channels, element14 and RS Components, to handle its first Raspberry Pi orders.

Facing amateurs and enthusiastic DIY technology fans, Raspberry Pi sales are very good.

Raspberry Pi is a mini computer aimed at computer hobbyists, teachers, primary school students, and small businesses. It is pre-installed with Linux system. It is only the size of a credit card. It is equipped with an ARM architecture processor and has computing performance similar to that of a smartphone.

In terms of interfaces, Raspberry Pi provides a USB interface for keyboard and mouse, in addition to a Fast Ethernet interface, an SD card expansion interface, and an HDMI high-definition video output interface that can be connected to a monitor or TV.

Basic introduction Chinese name: Raspberry Pi Foreign name: Raspberry Pi Full name: The Raspberry Pi Foundation Purpose: Promote technology Order: Raspberry Pi Historical development, version configuration, accessories modules, related books, latest information, sales, domestic channels, society

Evaluation, historical development When I checked the pin definitions of raspberry pi version B, I found that r-pi has gone through 4 generations in just one year. Now I will share with you the pictures of several versions I collected and briefly talk about each one.

Version differences.

When the model diagram was first created, the test version of raspberry pi was born at King's College London, UK, referred to as KCL. The school has a complete electronic development environment, including its own printed circuit board, so the original version of raspberry pi has the Raspberry Pi Logo.

The circuit board number KCL-8-94V-0 is on the left side. The parts used in the board are all miscellaneous non-production materials. The first version of the physical photos only appeared in some internal user posts on the official forum and has not been circulated in the market.

The first version officially released for mass production is very similar to it. There is no difference in the use of basic parts specifications, except that the connectors and patch components all use factory mass-produced specifications. The materials are good, and the board has shed the greenness of the beta version.

, become mature and sexy.

After the official first version was launched, major media began to report wildly, and the Raspberry Pi team became stronger and stronger. The Raspberry Pi could not withstand the fiddling of global Geeks, and the overclocking core appeared very early, until 2012-8-16

At the beginning, the official also provided overclocking cores and opened config.txt for custom overclocking. However, this was only officially opened after the second version was released.

The reason is that from feedback on the official forum, it was found that the temperature increased significantly after overclocking, especially the two green resistors in the upper right corner, which greatly reduced their lifespan. Therefore, the official replaced the high-performance resistor numbered "0000" in the second version (

Thanks to the netizen for correcting me. It should be that the resistor originally used for current limiting heats up too much, which also causes the output current of u*** to be too small. The new version uses a 0 ohm resistor to solve this problem), which solves this problem.

But this is not over yet. From the feedback on the official forum, it is pointed out that the official has added voltage detection to the Broadcom BCM2835 chip. When overclocking, the warranty will be lost. It is true that the temperature is higher after overclocking, but cat /proc

The Revision parameter in /cpuinfo may change from 2, 3 to 1, and feedback from the forum also confirmed this.

In fact, after the success of the first version, the official has started to develop a fully revised version of REV 2.0 to solve some problems that were not considered at the beginning of the design and provide better support for convenient installation and expansion. The cost is that a large number of

Old pin interface accessories need to be recoded according to the new pin definitions.

This revision is officially 2.0, which is a real upgraded version.

①Two screw holes ②Changed the definition of some GPIO pins... ③Corrected one silk screen: the old version of "10M" should actually be "100M" ④Added two RESET pins to connect a reset button.

The quote is from the summary of a friend on the forum. Many people think this is just a bug-free version, but I think this version laid the foundation for subsequent versions. Because of the success of the first version, the official decided to move production to the UK. It is conceivable*

** It is also supported. With the efforts of both enthusiasts and officials, the raspberry pi project will definitely last for a long time. Maybe another palm company will be born.

So for this REV 2.0 revision, the official will definitely consider more things in the future. Maybe the new high-performance version is already in alpha, but it will definitely be based on this REV 2.0 to achieve a smooth upgrade.