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The new Pi Terminal from Elecrow integrates a 7” IPS touchscreen, a Raspberry Pi CM4 module, and sockets for mini-PCIe cards into one platform. The module packs so many connectors and onboard peripherals that there is no need to add anything else. The acrylic case provides antenna slots for Wi-Fi and GSM, while a small fan ensures the CPU always works within its recommended temperature.
The module’s main selling point remains the bright 7” HD display with a five-point touchscreen. With a 400cd/m2 light intensity, it easily outshines similar displays, and at 9W, the module does not consume more than a regular Raspberry Pi board. Targeting the IoT industry, the screen is IP65-rated and comes with optional stereo speakers. The display uses one of the CM4 HDMI outputs, leaving an extra HDMI connector for an external screen.
Elecrow Pi Terminal: Price and availability
Elecrow sells displays to connect to embedded platforms such as the Raspberry Pi through the HDMI port. The Pi Terminal costs $179.90 without the processor module or accessories. Other cheaper displays support only USB peripherals.
Elecrow Pi Terminal: Design
The Pi Terminal ships between two foams that protect the glass panel. Accessories include four antennas, one 12V 24W power supply, and block connectors with screws. The acrylic panel surrounding the display protects the screen’s top and bottom. Four metal spacers hold the unit, providing a robust feeling to it. A small fan at the back can be loud at times. The unit measures 19.2 cm x 12.5 cm x 4.6 cm and weighs 665 grams.
Five screws secure the screen to the acrylic back panel. Four antenna connectors, in the form of SMA connectors, are located at the top. The bottom case has laser engravings showing connector pinouts, which is handy if one needs to quickly find where to insert the Raspberry Pi SD card, for example.
Unfortunately, Elecrow has not provided a schematic for the main PCB. The user manual states that the power supply can range from 12V to 18V, while the engraving on the case shows a maximum of 36V. An on/off switch on the left allows powering down the unit while not in use. A push button on the top helps to wake or sleep the OS. Three LEDs on the left give status such as power or Ethernet activity, or can act as a user-actionable indicator.
The PCB design is straightforward under the hood, with the Pi CM4 module located off-center to the left. Two mini PCIe sockets fully utilize the Pi’s high-speed interfaces. A small 5V fan provides airflow to the CPU. A buzzer and a battery holder for a CR1220 lithium cell are present, avoiding time loss when power is removed. Finally, a 40-pin header makes the PI’s GPIOs accessible to the end-user.
Elecrow Pi Terminal: Use
The terminal power consumption depends on the peripherals to which it is connected. With only the Pi connected, the unit consumes about 10W. A complete system with two mini PCIe cards, a USB keyboard, and a mouse brings the total to 15W. The supplied power adapter should be sufficient for doing software development on an IoT product. Deploying the unit in a production environment will require a more robust power adapter. Elecrow has included an option for installing a PoE module next to the Ethernet connector.
We recommend replacing the small fan with something less noisy. The stock 5V fan buzzes a lot, reaching 45 dBA at one meter. A passive cooling solution is superior in all aspects for an industrial setting and should provide a longer lifetime. Screen control for brightness and contrast is nonexistent, and IO voltage protection is unavailable on the Pi’s 40-pin header.
Elecrow does not provide any source code for the UI demo on the micro SD card. Even though the Raspberry Pi compute module has plenty of applications to demonstrate its use as a graphical unit, having example code for peripherals such as the LoRaWan module or the 4G module to test right out of the box would have been great. The newer CM5 compute module provides an easy upgrade to the CM4 since it is almost pin-compatible in the same footprint. The CM5 improves from the previous generation by having over twice the processing power.
Elecrow Pi Terminal: The competition
Elecrow’s Pi Terminal does not lack competitors. Seeedstudio’s Pi screen, the reTerminal, offers similar characteristics, with a multitouch 5” screen powered by the CM4. It provides passive cooling but costs $200, slightly higher than the Pi Terminal. It also lacks a standard PCIe interface like the mini PCIe connector available on the Pi Terminal.
Elecrow Pi Terminal: Final verdict
The Pi Terminal is an excellent example of integrating off-the-shelf parts into a product. Elecrow has extensive experience building embedded displays, which is evident in this product. The CM4 module provides ample processing power, while the abundance of connectors will cover many IoT use cases. The board layout is small, well-organized, and solid. The only drawback is the tiny but noisy fan. Documentations such as the schematic or project source code are also lacking, making repairing or troubleshooting the unit harder.
Buy the Pi Terminal if you need a robust screen and a CPU with excellent support and documentation.
Don’t buy the Pi Terminal if you need an economical, simple-to-use display.
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