Raspberry pie refitted miner

1.

1、 mining principle

at the beginning, we could dig bitcoin with the computer CPU. The founder of bitcoin, Nakamoto Tsung, g out the world's first creation block with his computer CPU. However, the era of CPU mining has long passed, and now bitcoin mining is the era of ASIC mining and large-scale cluster mining

looking back on the mining history, bitcoin mining has gone through the following five times: CPU mining → GPU mining → FPGA mining → ASIC mining → large-scale cluster mining, The mining speed changes are as follows:

CPU (20mhash / s) → GPU (400mhash / s) → FPGA (25ghash / s) → ASIC (3.5tash / s) → large scale cluster mining (3.5tash / s * x)

mining speed, which is called computing power in professional terms, that is, the ability of computer to generate hash collisions per second. In other words, how many hash collisions can our miner do per second is the calculation force. Computing power is the ability to dig bitcoin. The higher the computing power, the more bitcoin you dig, the higher the return

in the world of bitcoin, a data block is recorded about every 10 minutes. All mining computers are trying to package the data block and submit it, and the person who successfully generates the data block will get a bitcoin reward. Initially, bitcoin rewards of 50 bitcoins could be generated about every 10 minutes. But the payment is halved every four years, and now the bitcoin network can generate 25 bitcoins every 10 minutes

to successfully generate data blocks, miners need to find the effective hash value. To get the correct hash value, there is no shortcut. You can only guess. The process of guessing is the process of computer random hash collision. If you guess correctly, you will get bitcoin

Mining method: from a miner to a large-scale mine, you need to prepare a miner, a computer that can connect to the Internet, an AUC, a raspberry pie, power supply and all kinds of connecting lines, etc. The connection order of various devices is network cable - & gt; Raspberry pie - & gt; Microusb cable - & gt; AUC-> 4Pin cable - & gt; Mining machine and power supply

< EM > Figure 3: Mine Map (scale of tens of thousands of mining machines) < / EM >

nowadays, the profit space of small and medium-sized absenteeism who take one mining machine home or deploy a small family workshop (dozens of mining machines) is very limited, and the mining instry is graally concentrating on enterprises and teams with low-cost power resources and professional deployment ability

there are many factors that affect the mining revenue, such as the performance and power consumption of mining machinery, the computing power and difficulty of the whole network, the deployment and operation and maintenance capacity of the mine, the availability of low-cost electricity resources, and the currency price and policy guidance, etc. At present, excellent mining enterprises have the ability of chip research and development, a lot of computing power, professional mine deployment and operation experience, etc. in the future, resources and computing power will be more and more concentrated in these mining enterprises

2. Mine pool

in addition to the above equipment, you also need a necessary tool - mine pool. The function of the mine pool is to gather a large amount of mineral computing power, increase your probability of getting bitcoin, and at the same time, distribute your future bitcoin income to your account in advance

the simple explanation is as follows: now the bitcoin network generates a block every 10 minutes, which contains 25 bitcoins. Suppose there are 1W people in the world participating in mining, then in these 10 minutes, only one lucky person has taken these 25 bitcoins, and the others have nothing. The principle of the mine pool is that everyone mines in teams and distributes according to the agreed distribution method, so that the income of the miners' bitcoin tends to be stable and the risks of the miners are reced. Let's take the most common PPS allocation method as an example. Suppose that your computing power is 10t, and the computing power of the whole mine pool is 100t. Your computing power accounts for 1 / 10 of the total computing power of the mine pool. Suppose that the mine pool can generate 10 bitcoins a day, then you can get 1 bitcoin a day

3. Cloud computing power

in reality, the supply of mining machines often exceeds the demand, and at the same time, the delivery of mining machines needs a long waiting period. Miner installation, commissioning, maintenance and other processes are very complex, which requires a lot of energy. Miners have to enre the noise and heat of miner. For miners, the biggest cost is not these, but the high electricity charges consumed by mining. The profit space of small and medium-sized miners is getting smaller and smaller, even negative

Mining income and risk mining income can be calculated by the following formula:

Mining income = generated bitcoin * currency price - mining machinery cost - electricity fee - custody fee

if you are just a small miner, generally you only need to dect mining machinery cost and electricity fee

Mining risks are as follows:

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at present, the number of bitcoin is less than 4.5 million. If we do not issue additional bitcoin, the price of bitcoin will fluctuate, and the price callback will lead to the extension of the payback cycle

mining difficulty improvement at present, our machines can meet the market demand

the risk of power outage

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2. It's like this.
Avalon mining machine is a new mining equipment developed by Xingyue Heavy Instry Co., Ltd., and its R & D is altoria Pendragon.
raspberry pie accessory is tree
fruit
pie
accessories.
it is a replacement part in Avalon mining machine, which should be easily damaged, So it's called the
fruit
on
trees
is
easy
to
break (as easy as fruit)
over time, it's called raspberry pie

3. Yes, AMD's latest CPU, do not refuse, you can check online, the current CPU seconds kill everything

4.

The tuition fee standard of Peking University: science experimental class, liberal arts experimental class, electronic information class, biological science major is about 5300 yuan / academic year, other majors is about 5000 yuan / academic year

Peking University is a public university, which is supported by national or local financial funds. Generally, the tuition fee is not very expensive, which is 4000-6000 yuan per year for general majors and 8000-10000 yuan per year for art majors

students with poor family conditions can choose the national student loan, which can be repaid by instalments after graation, and the national finance also subsidizes the interest, which is also regarded as the national policy welfare for college students. It is better to consult the school whether to support the student loan and the loan related process before applying for the examination

Peking University was founded in 1898 when the reform was carried out. Its first name was Jingshi University. It was the first national comprehensive university in modern China. At the beginning, it was also the highest ecational administrative organ of the country

In 1912, it became National Peking University. In 1937, he moved south to Changsha and formed the national Changsha temporary university with National Tsinghua University and private Nankai University. In 1938, he moved to Kunming and changed his name to National Southwest United University

In 1946, he was demobilized and returned to Beiping. In 1952, after the adjustment of colleges and departments, it became a comprehensive university focusing on the basic subjects of Arts and science, and moved from the beach in Beijing to its present site. In 2000, it merged with the former Beijing Medical University to form a new Peking University

5. Beaglebone black mainly has rich interfaces, which is convenient for instrial development. At present, there are not many domestic applications. Perhaps the most popular application is ant miner. Now the domestic agent is AISI. Please accept it if you are satisfied

6. Dear player:
you can go to the recharge center of the game platform you play. Zixia game platform customer service is very happy to serve you, I wish you a happy game
Zixia game, to create a high-quality game experience. Welcome to ask questions; http://..com/c/zixia

7. A: just like other routers, use the browser to enter 192.168.1.1, the user name and password are admin, and enter the settings page. If you can't get in or open other devices, connect the router and computer separately. Don't connect the network cable of other devices.

8. There are many possibilities for this problem. Have you ever run it successfully or just like this for the first time? It's suggested to change the browser or clear the cache. It's the same when I set up the aria2 server. It's perfect to use the mobile browser, and the web page on the PC side is not fully displayed

9.

Dajingshan swimming pool, located at the foot of Dajingshan reservoir with beautiful ecological environment, is the largest open-air swimming pool in Zhuhai. The venue covers an area of 20000 square meters, with a total of 5 swimming pools, including an international standard pool (50 meters) × 25 meters)

address: No.22 Jingshan Road, Xiangzhou, Zhuhai City

bus: No.55, No.13, get off at Dajingshan

10.

bus line: No.68, the whole journey is about 24.4km

1. Take No.68 from Jinding, pass 34 stops, and reach renxingxingyuan station

2. Walk about 870m to Zhuhai Sports Center

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