3. 主動散熱，可將熱氣從 USB 和 Ethernet 空隙中帶走。
Raspberry Pi 4 Case Fan 採用下吹式的主動散熱方式，配合紅白外殼的機構，可有效的將熱氣從 USB 和 Ethernet 處抽走，達到絕佳的冷卻效果。
圖片來源：Designing the Raspberry Pi Case Fan
* Integrated PLL; Transmitter; Receiver; Baseband; and A2D * 76- to 81-GHz Coverage With 4-GHz Continuous Bandwidth * Four Receive Channels * Two Transmit Channels * Ultra-Accurate Chirp (Timing) Engine Based on Fractional-N PLL * TX Power: 12.5 dBm * RX Noise Figure: 14 dB (76 to 77 GHz)/15 dB (77 to 81 GHz)
Built-in Calibration and Self-Test (Monitoring)
* ARM® Cortex® -R4F-Based Radio Control System * Built-in Firmware (ROM) * Self-calibrating System Across Frequency and Temperature
DSP
C674x DSP for FMCW Signal Processing
MCU
* ARM Cortex-R4F Microcontroller for Application Control * I/O; SPI / CAN x 1 * Up to 2 UARTs I2C x 1 * GPIO: 0 ~ 2
Pre-Programmed Firmware "Flavor"
* Vital Signs Detection (VSD) Firmware; for 30cm ~ 90cm wireless & contactless detection of Heartbeat & Respiration Rate * High Accuracy Measurement (HAM) Firmware; for 30cm ~ 300cm distance measurement with millimeter resolution * People Movement Behavior (PMB) Firmware; for detecting People Movement in 4m x 4m or 16 meter-square region for setting geo-fence(s) trigger action * Note: ONLY one of VSD; HAM; or PMB Firmware is pre-programmed within a single mmWave Module
Operating Temperature
0° to 40° degree Celsius
Operating Humidity
10 ~ 85% Non-Condensing
Dimensions & Weight
54.1mm x 45.7mm; 13.7 grams net
《出貨清單》
* mmWave 雷達 x1
* Raspberry Pi BLE HAT 擴充板 x1
* 塑膠螺絲柱 x8
Texas Instruments PCM5122 DAC
– 192kHz Sampling Rate / 24bit Resolution Burr-Brown DAC for best sound quality
– Hardware volume control for best quality using “alsamixer”
Texas Instruments TPS7A4700 Ultra Low Noise Voltage Regulator
Switchable Power Option
– Power from a single microUSB port or independently
Raspberry Pi Power switch
– Turn on and Gracefully shut down Raspberry Pi System
6 GPIO buttons for Media Control
Infrared Receiver and Remote Control
– LIRC compatible
1.3″ OLED display with multi-language support.
– Resolution: 128 x 96
《特色》
* Broadcom BCM2835 ARMv6 system-on-a-chip, running at up to 1GHz
* 512MB on-board RAM
* Unpopulated 40pin GPIO for added flexibility
* MicroSD port for OS and storage
* Micro USB power input
* 1x Micro USB Data port and Mini HDMI Port
圖片來源：Introducing the Raspberry Pi Zero
2015-11-21:
* Included IBM Node-RED IoT application
* Included graphical package manager
* Included accelerated pixman library
* Updated Epiphany browser to improve video compatibility
* Updated Scratch with performance improvements and bug fixes
* Updated Raspberry Pi configuration to allow boot to pause while
network is established
* Various minor bug fixes
技術規格如下：
• 700MHz Broadcom BCM2835 CPU
• 256MB RAM
• 40pin extended GPIO
• 1 x USB 2.0 port
• 4 pole Stereo output and Composite video port
• Full size HDMI socket
• CSI camera port (Raspberry Pi camera module)
• DSI display port (Raspberry Pi touch screen display)
• Micro SD port
• Micro USB power connector
• 4 mounting holes
• Size : 65mm x 56mm
• Weight : 23g
技術規格如下：
• 700MHz Broadcom BCM2835 CPU with 512MB RAM
• 40pin extended GPIO
• 4 x USB 2 ports
• 4 pole Stereo output and Composite video port
• Full size HDMI
• CSI camera port for connecting the Raspberry Pi camera
• DSI display port for connecting the Raspberry Pi touch screen display
• Micro SD port for loading your operating system and storing data
• Micro USB power source
