NNEPS: Network-Updated E-Paper Signage with Reduced Standby Power Consumption Takafumi Akiba and Tsubasa Yumura Hokkaido Information University Introduction • Electronic paper signage (EPS) is a type of digital signage that specializes in displaying still images. • Using EPS, which is updated via the network, the computer controlling the e-paper continuously consumes power while waiting for content and cannot fully leverage the features of e-paper. Proposed Method • In existing network-updated EPS, the display control PC is always running and consumes power • In the proposed method, when updating content, the control PC starts up upon receiving a notification, and the control PC turns off when the e-paper display update is complete. • We named the system that realizes EPS with normally-off network electronic paper signage Normally-off Network Electronic Paper Signage (NNEPS). System Configuration • The NNEPS is composed of an e-paper, an e-paper control PC, and a power control plug. • The power control plug stands by with the communication function turned on and turns the power supply to the e-paper control PC on and off as needed for screen updates, thereby enabling the EPS to achieve normally-off. Conclusion • In this study, we confirmed that the proposed method is more effective in reducing power consumption than existing methods. • In the future, we would like to work on the implementation of increasing the number of EPSs controlled by NNEPS. Assessment of power reduction • The NNEPS measured power for two different cases, one with one EPS connected to the relay module and the other with two EPSs connected to the relay module. • The frequency of screen refreshes was set to once every five minutes, and power consumption was measured for one hour. • Under these conditions, the proposed method, NNEPS-1, reduced the amount of electricity by about 33% compared to the existing method. Implementation • The M5Stack Core2 for AWS (Amazon Web Services) was used as the micro-controller that controlled the relay modules. • The M5Stack implements firmware that turns the relay module on and off in response to notifications via MQTT (Message Queuing Telemetry Transport). • Multiple EPSs can be connected using relay modules to manage power on/off status. 2.81 1.25 1.88