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2 x RS-232/485 Serial Port
UART Input Voltage 3
They are particularly useful for measuring whole building electricity consumption (or generation for that matter)
LEGACY Dissolved Oxygen Probe Datasheet
PSA-01: ESP8266 based 1 Channel Smart Switch Module for Home Automation Devices IoT Dev 2 x RS-232/485 Serial PortPSA 01: ESP8266 based 1 Channel Smart Switch Module for Home Automation Devices PSA Module is a high integration and general purpose 1 channel (1 gang) smart switch module for DIY home automation. It's a great product for home automation DIY fans and smart home manufacturers. The IoT development module is based on ESP8266, designed for socket and switch. The IoT module acts like a transfer station which can receive and transfer messages via WIFI. The
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