Modular HMI touch-panel runs on Raspberry Pi CM4

Apr 15, 2021 — by Eric Brown — 974 viewsSeeed unveiled a $195, Raspberry Pi CM4-based “ReTerminal” HMI device with a 5-inch, 1280 x 720 touchscreen, a crypto chip, WiFi/BT, GbE, micro-HDMI, CSI, 2x USB, and 40-pin and PCIe expansion.

Seeed has announced a modular human-machine interface (HMI) device based on the Raspberry Pi Compute Module 4 .

ReTerminal GUI display (left) and detail views (click images to enlarge) There is no mention of M.2 or mini-PCIe, but only an external, rear-mounted “vertical high-speed expansion interface” with PCIe x1, USB 2.0 host, 26x GPIOs, and a PoE interface.

Optional modules include mic array/speaker, LoRaWAN, 5G/4G, ZigBee, Sub-1GHz, PoE, and an Ethernet switch.

ReTerminal modules (click image to enlarge) This description, along with the image above, the M4 mounting nuts, and a note that “all components and ports on the device are surface-mounted on two sides,” suggests that Seeed is launching a product line of custom expansion modules in plastic housing.

The ReTerminal provides several extras including a digital light sensor, an accelerometer, and an RTC.

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