NanoPi NEO Plus2

The NanoPi NEO Plus2 is another Allwinner based ARM board developed by FriendlyElec. It uses Allwinner's 64-bit quad-core A53 SoC with hexa-core Mali450 GPU and features 1GB of DDR3 RAM and 8GB eMMC.
With a small size of only 40 x 52mm the NanoPi NEO Plus2 has rich on-board resources: AP6212A WiFi & Bluetooth module, Gbps Ethernet and two USB hosts. It supports system-boot from a MicroSD card.
The NanoPi NEO Plus2 has a carefully designed power system and 6-layer PCB layout. These features enhance the board's heat dissipation.
The NanoPi NEO Plus2 meets popular IOT applications requirements for small size, high-speed and large throughput data transmission and high performance computing.
Link to purchase:NanoPi NEO Plus2

Based on this crucial observation, our solution to reducing the channel ac- cess overhead is a novel PHY/MAC design,WiFi-Nano, with slots as small as 800 ns. 37 In WiFi-Nano (Section 3), all transmittersspeculatively trans- mit their preamblesin the slot where their backoff counters expire. The 32 inch 4k IPS 144hz's. Any others I should be keeping an eye out for? (Update: Likely Delays till 2nd Half of 2021). Signals and slots are a way of decoupling a sender (the signal) and zero or more receivers (the slots). Let's say you a system which has events that you want to make available to any other part of the system interested in those events.

SoC: Allwinner H5，Quad-core 64-bit high-performance Cortex A53
DDR3 RAM:1GB
Storage: 8GB eMMC
Network: 10/100/1000M Ethernet based on RTL8211E-VB-CG
WiFi: 802.11b/g/n
Bluetooth: 4.0 dual mode
MicroSD Slot: 1 x Slot. It supports system booting or is used to hold a storage card
Audio Input/Output: 5-Pin, 2.0mm pitch pin-header
MicroUSB: power input
Debug Serial: 4Pin, 2.54mm pitch pin-header
GPIO1:24Pin, 2.51mm pitch double-row pin-header containing UART, SPI, I2C and IO
GPIO2:12Pin, 2.54mm pitch pin-header containing USB, IR receiver,I2S and IO
Power Supply: DC 5V/2A
PCB Dimension: 40 x 52mm
PCB Layer: 6-Layer

Nano Signal Slot Booster

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Software Features(UbuntuCore)

mainline kernel: Linux-4.x.y
64-bit OS
npi-config: system configuration utility for setting passwords, language, timezone, hostname, SSH and auto-login.
auto-login with user account 'pi' with access to npi-config
supports Gbps Ethernet
supports WiFi and Bluetooth
supports FriendlyElec's FA-CAM202 USB camera
supports audio recording and playing

Diagram, Layout and Dimension

GPIO Pin Spec

Pin#	Name	Linux gpio	Pin#	Name	Linux gpio
1	SYS_3.3V	2	VDD_5V
3	I2C0_SDA / GPIOA12	12	4	VDD_5V
5	I2C0_SCL / GPIOA11	11	6	GND
7	GPIOG11	203	8	UART1_TX / GPIOG6	198
9	GND	10	UART1_RX / GPIOG7	199
11	UART2_TX / GPIOA0	0	12	GPIOA6	6
13	UART2_RTS / GPIOA2	2	14	GND
15	UART2_CTS / GPIOA3	3	16	UART1_RTS / GPIOG8	200
17	SYS_3.3V	18	UART1_CTS / GPIOG9	201
19	SPI0_MOSI / GPIOC0	64	20	GND
21	SPI0_MISO / GPIOC1	65	22	UART2_RX / GPIOA1	1
23	SPI0_CLK / GPIOC2	66	24	SPI0_CS / GPIOC3	67

USB/Audio/IR Pin Description

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NanoPi NEO Plus2
Pin#	Name	Description
1	VDD_5V	5V Power Out
2	USB-DP1	USB1 DP Signal
3	USB-DM1	USB1 DM Signal
4	USB-DP2	USB2 DP Signal
5	USB-DM2	USB2 DM Signal
6	GPIOL11 / IR-RX	GPIOL11 or IR Receive
7	SPDIF-OUT / GPIOA17	GPIOA17 or SPDIF-OUT
8	PCM0_SYNC / I2S0_LRC	I2S / PCM Sample Rate Clock/Sync
9	PCM0_CLK / I2S0_BCK	I2S / PCM Sample Rate Clock
10	PCM0_DOUT / I2S0_SDOUT	I2S / PCM Serial Data Output
11	PCM0_DIN / I2S0_SDIN	I2S / PCM Serial Data Input
12	GND	0V

Audio

Pin#	Name	Description
1	MICIN1P	Microphone Positive Input
2	MICIN1N	Microphone Negative Input
3	LINEOUTR	LINE-OUT Right Channel Output
4	GND	0V
5	LINEOUTL	LINE-OUT Left Channel Output

Debug Port（UART0）

Pin#	Name
1	GND
2	VDD_5V
3	UART_TXD0 / GPIOA4
4	UART_RXD0 / GPIOA5 / PWM0

Note:

SYS_3.3V: 3.3V power output
VVDD_5V: 5V power input/output. The input range is 4.7V ~ 5.6V
All pins are 3.3V, output current is 5mA
For more details refer to the document: NanoPi-NEO-Plus2-1704-Schematic.pdf

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Signals and slots is a language construct introduced also in Qt^[1] for communication between objects which makes it easy to implement the observer pattern while avoiding boilerplate code. The concept is that GUI widgets can send signals containing event information which can be received by other widgets / controls using special functions known as slots. This is similar to C/C++ function pointers, but signal/slot system ensures the type-correctness of callback arguments.^{[citation needed]}

The signal/slot system fits well with the way graphical user interfaces are designed.^{[citation needed]} Similarly, the signal/slot system can be used for other non-GUI usages, for example asynchronous I/O (including sockets, pipes, serial devices, etc.) event notification or to associate timeout events with appropriate object instances and methods or functions. It is easy to use and no registration/deregistration/invocation code need to be written, because Qt's metaobject compiler (MOC) automatically generates the needed infrastructure.

A commonly used metaphor^{[according to whom?]} is a spreadsheet. A spreadsheet has cells that observe the source cell(s). When the source cell is changed, the dependent cells are updated from the event.

Alternative implementations[edit]

There are some implementations of signal/slot systems based on C++ templates, which don't require the extra metaobject compiler, as used by Qt, such as l