The Differences. Although the Raspberry Pi Compute Module 4 has the same computing power as the Raspberry Pi 4, one can think of the Raspberry Pi Compute Module as a stripped-down version of the Raspberry Pi 4 with no ports. So, a carrier board is necessary to use the Compute Module The Compute Module 4 IO Board is a companion board for Raspberry Pi Compute Module 4 (supplied separately). It is designed for use both as a development system for Compute Module 4 and as an embedded board integrated into end products

Features:

1. Micro SD card slot
2. CSI interface
3. USB2.0 interface
4. Easy to use
5. Color: green
6. Raspberry Pi Compute Module 4
7. 40PIN GPIO interface
8. PWR indicator
9. ACT indicator
10. AMS1117-3.3
11. BOOT switch

Specification:

1. CM4 Socket: suitable for all variants of Compute Module 4
2. Networking: Gigabit Ethernet RJ45 connector
3. Connector: Raspberry Pi 40PIN GPIO header × 1
4. USB: Raspberry Pi 40PIN GPIO header × 1
5. Display: MIPI DSI port × 1 (15pin 1.0mm FPC connector)
6. Camera: MIPI DSI port × 1 (15pin 1.0mm FPC connector)
7. Video: Mini HDMI port × 1, supports 4K 30fps output
8. Audio: 3.5mm jack
9. Storage: Micro SD card socket for Compute Module 4 Lite (without eMMC) variants
10. Power Input: 5V

Packages Includes:

1 x Waveshare Nano Base Board (B) for Raspberry Pi Compute Module 4, Same Size as the CM4

2-Channel Isolated CAN Bus Expansion HAT For Raspberry Pi, MCP2515 + SN65HVD230 Dual Chips Solution, Multi Onboard Protection Circuits. Enable Isolated And Stable CAN Bus Capability For Your Raspberry Pi .Standard Raspberry Pi 40PIN GPIO Header, Customized For Raspberry Pi Series Boards .MCP2515 CAN Controller + SN65HVD230 CAN Transceiver .SM24CANB TVS Diode, ESD Protection, Transient Peak Voltage Protection. high anti-interference capability, and stable operation. It suits for fields such as automotive devices or industrial automation.

Useful link:

To do Hardware and Software setup, please follow this tutorial.

features:

1. Adopts MCP2515 and SN65HVD230 dual chips combined solution,
2. allows 2-channel CAN communication
3. Integrated power isolation, providing stable isolated voltage
4. Onboard digital isolator, signal isolation makes the communication more safe, more stable, and better anti-interference
5. Onboard TVS (Transient Voltage Suppressor) diode, provides ESD protection and transient peak voltage protection
6. Onboard voltage translator, select 3.3V/5V operating voltage by jumper
7. Onboard 120Ω terminal resistor, configured by jumper
8. Breakout SPI control pins, for connecting with host control boards like STM32/Arduino

package include:

1 X Waveshare 2-Channel Isolated CAN Expansion HAT for Raspberry Pi

Compute Module 4 POE Board is a baseboard that can be used with Raspberry Pi Compute Module 4, and supports POE power supply and 7~36V DC power supply, with four onboard USB2 .0 for user convenience.

User Guide: 

1. Confirm the fan voltage before connecting, it support 5V and 12V. if you want to connect 12V by default, please modify the jumper cap of FAN_VCC
2. USB Type C interface is used as the USB SLAVE interface to burn the image, and it can also be used as the power supply interface, but cannot be used as the OTG interface.
3. The BOOT switch is for CM4 startup mode, the ON for CM4 to enter the programming mode, and the OFF for system to starts normally.
4. In normal use, it is necessary to provide at least 5V 1.5A power supply for CM4. Otherwise, there may be problems such as automatic shutdown, frequency reduction and so on.
5. USB2.0 is closed by default, if you want to open it, you need to add dtoverlay=dwc2,dr_mode=host in config.txt
6. When using the POE function, pay attention to check whether the switch supports PoE of the 802.3af network standard.
7. When you need to use POE, connect the POE jumper cap to the EN position.
8. The Change LED light is the charging indicator, it is always on when charging, goes off when fully charged, and flashes when it fails.

Dynamic Path Management, More Stable Power Supply

Dimensions

Features:

1. H.265 (HEVC) (up to 4Kp60 decode), H.264 (up to 1080p60 decode, 1080p30 encode)
2. OpenGL ES 3.0 graphics
3. Options for 1GB, 2GB, 4GB or 8GB LPDDR4-3200 SDRAM with ECC (see Appendix B)
4. Options for 0GB (CM4Lite), 8GB, 16GB, or 32GB eMMC flash memory (see Appendix B)
   Peak eMMC bandwidth 100MBps (four times faster than previous Compute Modules)
5. Gigabit Ethernet PHY supporting IEEE 1588
6. 2 × HDMI 2.0 ports (up to 4Kp60 supported)
7. Three external power supply options: USB interface, wide voltage DC, and PoE
8. When connected to the external power supply, the system will be powered and the battery will be charged at the same time, and the battery will be in a disconnected status after being fully charged, so as to avoid battery life damage caused by frequent charging and discharging
9. When the external power supply is insufficient, the battery will provide power output together with the external power supply at the same time to ensure the system normal operation
10. When the external power supply is connected, the system will keep running normally even when the battery fails or is taken out. When the external power supply is disconnected, it will automatically switch over to batteries output without interrupting the system operation

Packages Includes: 

1 x  Waveshare PoE UPS Base Board Designed for Raspberry Pi Compute Module 4, Gigabit Ethernet,

CM4-NANO-C (Raspberry Pi CM4 Ultra Mini Expansion Board Type B) is a baseboard that can be used with Raspberry Pi Compute Module 4. Although it is tiny, it can bring out the interface of Raspberry Pi Compute Module 4 with an onboard camera.

Features:

1. Multiple Interfaces, Onboard 8MP Camera
2. Suitable For Evaluating The Raspberry Pi CM4 Or Being Integrated Into End Products
3. ON: Switch USB to Type C interface, will enter download mode when powered on (configured as a large-capacity disk through RPI boot)
4. 5V power supply, or used for eMMC burning

Specifications:

1. CM4 Socket: suitable for all variants of Compute Module 4
2. Connector: Raspberry Pi 40PIN GPIO header × 1
3. USB: USB 2.0 Type-A port × 1
4. Display MIPI DSI: port × 1 (15pin 1.0mm FPC connector)
5. Camera: IMX219-D160 (8MP, 160°FOV)
6. Video: Mini HDMI port × 1, supports 4K 30fps output
7. Storage: TF card socket for Compute Module 4 Lite (without eMMC) variants
8. Power Input: 5V

Package Includes:

1 x Waveshare Nano Base Board (C) for Raspberry Pi Compute Module 4, Same Size as the CM4, Onboard 8MP Camera

Isolated RS485 CAN HAT (B) For Raspberry Pi, 2-Ch RS485 And 1-Ch CAN, Multi Protections

Features: 

1. Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi, series boards
2. 1-Ch CAN, adopts MCP2515 controller and CAN transceiver, converts SPI to CAN
3. 2-Ch RS485 adopts SC16IS752+SP3485 dual-chip combination, converts SPI to RS485
4. The onboard power conversion circuit supports an 8~28V wide voltage power supply and can power the Raspberry Pi at the same time
5. Onboard unibody power supply isolation, providing stable isolated voltage, no extra power supply required for the isolated terminal
6. Onboard unibody digital isolation, for isolating the signal, reliable and jam-proof, low power consumption
7. Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic
8. Onboard resettable fuse and protection diodes, ensures the current/voltage stable outputs, provide over-current/over-voltage proof, improve shock resistance
9. Onboard 120Ω terminal resistor, configured by jumper
10. Onboard terminals and pin headers make, a more convenient connection
11. Breakout SPI control pins, for connecting with host control boards

Specifications:

1. Operating Voltage: 3.3V
2. Expanded Interface: 2-Ch RS485 + 1-Ch CAN
3. Communication Interface: SPI
4. CAN Controller: MCP2515
5. CAN Transceiver: SIT65HVD230DR/SN65HVD23D
6. CAN Baud Rate: ≦1Mbps
7. UART Expansion Chip: SC16IS752
8. RS485 TRANSCEIVER SP3485
9. RS485 Baud Rate: 300~921600 bps
10. Power Supply External power supply terminal OR Raspberry Pi
11. External Power Supply Range: DC 8~28V

Package Include:

1 x Waveshare Isolated RS485 CAN HAT (B) For Raspberry Pi, 2-Ch RS485 and 1-Ch CAN, Multi Protections

Sense HAT (C) For Raspberry Pi, Onboard Multi Powerful Sensors, Supports External Sensors.Trying to make the Pi become a robot that can detect movement and orientation? Or using the Pi to collect environmental temperature, humidity, and barometric pressure data? This HAT would be your ideal choice. Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards Onboard QMI8658C+AK09918 (3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer), detects movement, orientation, and magnetic Onboard SHTC3 digital temperature and humidity sensor, allows monitoring the environment.

Features:

1. The onboard LPS22HB barometric pressure sensor allows monitoring of the environment
2. Onboard TCS34725 color sensor, identifies the color of a nearby object
3. Onboard SGM58031, 4-ch 16-bit precision ADC, AD expansion to support more external sensor

Package Includes:

1 x Waveshare Sense HAT (C) for Raspberry Pi, Onboard Multi Powerful Sensors, Supports External Sensors