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Raspberry Pi is a credit-card sized computer that seals into a computer monitor or TV and uses a mouse and standard keyboard; it costs low. It is a little capable device that enables people of all ages to explore computing and learn how to program in languages like Python and Scratch. There are 7 different types of raspberry pi board models. They are
Raspberry Pi 1 Model B also has a 10/100 Ethernet port so that you can suit web pages from right there on the Pi. The system volume lives on an SD card, so it’s easy to debug, run and prepare several additional operating systems on the same hardware.
Most Linux distributions for the Pi will cheerfully live on a 2GB SD card, but larger cards are supported.
The Model B’s two built-in USB ports provide enough connectivity for a keyboard and mouse, and you can use a USB hub by adding more. However, it is recommended that you use a powered hub to overtax the on board voltage regulator.
Powering the Raspberry Pi is easy; plug any USB power supply into the micro-USB port. Unfortunately, there’s no power button, so the Pi will begin to boot as soon as power is applied; remove power, it will turn off.
Low-level peripherals on the Pi make it excellent for hardware hacking, and the 0.1″ spaced GPIO header on the Pi gives you access to UART, 8 GPIO, SPI, I2C, as well as 5 and 3.3V sources.
The Raspberry Pi Model A+ is a low-cost version of the Raspberry Pi and is smaller. It is established on the BCM2835 system-on-chip (SoC), including an ARM11 processor and a powerful GPU. The Raspberry Pi Model A+ is recommended for embedded and low-power projects that do not require Ethernet or multiple USB ports.
Raspberry pi model B is replaced us raspberry pi model B+. Model B+ Raspberry pi is compared with model B it has.
More USB: Model B+ has 4 USB 2.0 ports, two on the Model B and overcurrent behaviour with a better hotplug.
Micro SD: The push-push micro SD version is replaced with the
old friction-fit SD card socket.
More GPIO: Model A and B have the same pinout for the first 26 pins retained, with the GPIO model B+ having 40 pins.
Better Audio: The audio circuit has a reliable, low-noise power supply.
Lower Power Consumption: Here, the linear regulators are returned by switching one, and it will decrease the power consumption by between 1W and 0.5W.
Neater Form Factor: The USB connections are arranged with broad edges. There are four squarely-placed maintaining holes, and the video is moved composite with the 3.5mm jack.
Raspberry pi Zero model is half the size of the model A+ with twice a utility. Any project has the same specification like Micro-USB OTG port, 1GHz, 512MB RAM, Mini-HDMI port Micro-USB power, Single-core CPU, Composite video, HAT-compatible 40-pin header and resets headers and CSI camera connector.
The raspberry pi 2 has an ARM cortex-A7 quad-core processor with 900MHz, and the SDRAM is about 1GB. It is completely consistent with the raspberry pi 1.