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The space has relied heavily on two serially connected powerbars that provide a large number of switchable sockets used for hooking up devices/lamps to so that they are conveniently turned on/off via powerbar.ti infra. This infra is what the powerbutton(s) next to the door also talk to. However, there's a few issues with the current implementation that would be good to address. Mainly: * There's quite a considerable delay between command-and-result * The powerbars are 'fickle' to keep connected to * The powerbars only have serial, neccesitating some 'box' to interface with them * There are , afaik, no spares.. A dead bar would be a problem at this point * There are only two bars, requiring long cabling for devices not conveniently located closeby A solution has been found in the availability of a considerable amount of APC 7921 PDU's which are being phased out at a $dutch_ISP, making them relatively easily available. The units currently thrown out are in various states of defect, however. Mainly PSU or controller-issues. The good thing is that there seems to be an easy fix for the controller. The relay electronics interface well against an ESP8266/ESP32 So far, the following has been done: * [[APC7921|Documentation has been written about the internals of the APC 7921]] * [[APC7921-esp|A first PoC of an esp8266 board running ESPHome]] has been created that succesfully interfaces to the relay-board via i2c ToDos at this point: * Research if Current Transformer can be used 'as is' in esphome * Prototype schottky-diode setup for combining Dual PSU 24VDC in the device * Design an approach for monitoring PSU-status on the ESP * Choose an approach for the LAN connectivity. Home-brew or pre-made module * Choose controller for driving 2-digit display. * Choose an approach for 24DC-> 3.3V conversion. * Create schematic/PCB * Decide upon software. ESPHome seems viable candidate that provides all required Extra benefits expected from the new hardware: * Easier method of knowing state of any outlet, at any time * Integration with existing automation-frameworks are more straight-forward (HomeAssistant comes to mind) ** Enables adding non-powerbar-based outlets/lamps to be included more easily (Hue, Tradfri, Xiaomi, Sonoff) ** Allows telemetry/sensoring to be added via one infrastructure, one API)
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