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Product description: Base Board CM4Duino - pins expander for Raspberry Pi Compute Module 4 - compatible with Arduino - Waveshare 21738
Base Board CM4Duino is a pins expander from Waveshare designed for the Raspberry Pi Compute Module 4 Lite / eMMC computing module . The module has a special socket for connecting the CM4 module. It has been equipped with special connectors, thanks to which it extends the module 's capabilities by 40 GPIO pins, M.2 M KEY slot, USB2.0, CSI, HDMI connector, it also has a microSD card slot . The board is powered by 5 V, its dimensions are 73.58 x 53.34 mm.
Base Board CM4Duino - front view.
Kit contents
- Base Board CM4Duino - pins expander for Raspberry Pi Compute Module 4 - compatible with Arduino
The Raspberry Pi Compute Module 4 is not included in the kit - it must be purchased separately.
The manufacturer has prepared a user guide, which can be found on the product Wiki page .
The arrangement of elements on the board
- USB type C - power supply and system image upload interface; It can be powered by 5 V / 2 A, serves as an eMMC recording interface
- USB 2.0 - interface for connecting peripherals
- HDMI port - supports 4K 30 fps output
- BOOT switch button - two-state: ON - the CM4 module starts up to the USB type C port; OFF - CM4 boots to eMMC or microSD card
- CM4 connector - a socket for connecting the CM4 computing module
- CAM interface - MIPI CSI camera interface
- LED - LED for user programming
- ADC ADS7830 chip - 8-bit ADC, I2C interface, 8-channel
- Button - user programming button
- GPIO - Arduino GPIO interface
- Function switch - detailed information about its use can be found in the description of function pins
- M.2 interface - M.2 M KEY slot, for connecting a communication module or NVME SSD
- MicroSD slot - a slot for plugging in a microSD memory card to run Compute Module 4 Lite
The arrangement of elements on the board.
Base Board CM4Duino.
Technical specification of Base Board CM4Duino
- Model: Base Board CM4Duino
- Type: expansion board, pins expander
- Purpose: compatible with Raspberry Pi Compute Module 4
- Connectors:
- M.2 M KEY slot, for connecting a communication module or NVME SSD
- GPIO pins compatible with Arduino
- USB interface:
- 1x USB 2.0 type A
- 1x USB type C for uploading the system image
- Camera connector: 1x MIPI CSI-2 (15-pin FPC 1mm connector)
- Video connector: 1x HDMI, supports 4K 30fps output
- External memory slot: microSD card slot for Compute Module 4 Lite variants (without eMMC memory)
- Supply voltage: 5V
- Tile sizes: 73.58 x 53.34 mm
Precautions for use
- Do not connect or disconnect any device other than USB and HDMI when it is turned on
- Type-C interface can be used for power supply or as a USB interface for video recording (use BOOT switch to switch functions)
- To ensure correct power supply to CM4, do not connect other devices while using the Burn-in Type-C interface.
- During standard use of CM4, 5V / 2A power supply is necessary. Otherwise, problems such as automatic shutdown, frequency reduction and others may occur.
- The USB 2.0 interface is closed by default, if you want to open it you need to add the command: dtoverlay = dwc2, dr_mode = host in config.txt
The board also has a microSD memory card slot.
