Raspberry Pi CM3+ Based DevTerm Kit Features keyboard computer

10 December, 2020

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Clockwork has launched an open-source device, which runs Linux on a Raspberry Pi Compute Module 3+ Lite (CM3+ Lite) housed inside a keyboard chassis. ClockworkPi v3.14 integrates up to 12 interfaces in the ultra-small size of 95x77mm, ensuring sufficient connectivity for your work and entertainment. Following an easy-to-upgrade modular design of CPU and memory, CockworkPi v3.14 enables you to freely choose a suitable “Core” for various application scenarios. ClockworkPi v3.14 is compatible with the Raspberry Pi CM3 series, which means that your work on the Raspberry Pi can be “teleported” to a portable terminal in seconds!

The team writes:

“The A-04 series and RPI-CM3 are suitable for general purposes with longer usage time, such as writing, coding, e-mails, making indie-games, running most video game emulators, etc. If you usually use “Web Applications,” the A-0402 core module provides you with more memory to improve the experience. For users who require high performance and computing power, such as for AI/algorithm development and tuning, rapid prototyping of embedded devices, speeding up your compile-time, etc. The A-06 series will provide you a better solution. We also provide you with an option of the “DevTerm Kit” without the “Core Module.”

The 189 x 78mm DevTerm features the GameShell’s retro gameplay theme, with a retro-style gamepad integrated into the classical 67-key keyboard. The keyboard enables a mini-trackball with an OK function and 3x mouse buttons. The keyboard is powered by a Cortex-M3 MCU, which is compatible with the Arduino STM32 development environment. You can also customize the keyboard’s firmware via a micro-USB serial debug port available. Mounted above the keyboard is an ultra-wide, 6.8-inch, 1280 x 480-pixel IPS screen. The MIPI-DSI powered screen features a retro-style 16:6 ratio that can be scrolled via knobs on either side. The screen is protected with a removable cover. For media, the DevTerm features a micro-HDMI port, 3.5mm audio I/O jack, and a stereo amp chip. The board is connected to the keyboard via a USB-based POGO pin interface and enables a PMU chip that supports a dual battery holder compatible with various 18650 battery sizes.

The ClockworkPi v3.14 board enables connection via a 52-pin mini-PCIe interface to a separate “Ext. module” that is placed alongside it inside the keyboard. The Ext. module enables dual speakers, a MIPI-CSI interface, a micro-USB debug port, and two more USB 2.0 host ports. The Ext. module is also equipped with a 6000RPM fan which is aimed directly at the CM3+ module for rapid cooling. The DevTerm also features a thermal printer interface for a 58mm, 200dpi thermal printer. The printer is connected at the top of the screen and enables an input tray for storing printed copy.

Specifications include:

CPI v3.14 uses a compact design, the size is reduced to 95x77mm.
PMU chip which supports reliable and complete lithium battery charge and discharge management
Integrated 5G-WIFI (802.11ac) + Bluetooth 5.0
High-gain antenna
Standard USB-A 2.0 interface x 3 and, an internal contact interface for the Keyboard module
USB-C* charging port
TF card (Micro SD card) slot**
40 Pins MIPI screen interface
Micro-HDMI interface
3.5 headphone jack, supports microphone input
Onboard stereo audio power amplifier chip
40 Pins GPIOs expansion interface (using standard 0.5mm FPC connector)
52 Pins extension module interface (using standard Mini PCI-E connector) for the “EXT. module”
Standard DDR2-SODIMM 200 Pins interface: connects CPI v3.14 to the “Core module”