The battery-powered, low power design comprises a SimpleLink Wi-Fi CC3200 LaunchPad development kit that contains a single ARM Cortex-M4-based wireless microcontroller, and the e-paper display placed on a BoosterPack-compatible plug-in board. This board accommodates a choice of five e-paper display sizes from 1.44 to 2.7 inches and communication between the MCU and the display is via SPI. Operating from a battery source in the range of 2.3 to 3.6 VDC, which is typically 2xAA alkaline batteries, the battery life is use-case dependent. One set of batteries will usually last for several years, with polling frequency and number of updates determining the exact lifetime. The display can be updated locally, via an attached network, or via the internet from anywhere through a cloud-based application. Application firmware running on the MCU permits control of the displayed image either via an embedded HTTP page or via an MQTT client.
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