Differences

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--- door_access_controllers [2019-02-24 00:20] – created tim
+++ door_access_controllers [2019-02-24 00:35] – tim
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 ===== Overview =====
+The Hacklab door controllers are based on an ESP8266 wifi microcontroller and a PN532 NFC reader module. One controller is installed for each door, and each controller can operate a single 12V channel for an electric door release or magnetic lock. Inputs can be connected for door open/closed reed switch, exit request and local lock/unlock "snib" function.
 ===== PCB =====
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 ===== Software =====
+Two versions of firmware and server back-end are currently in operation.
+Common features:
+  * Ability to read any 13.54MHz ISO-14443 Type A token including MIFARE Classic/UltraLight and NFC tags.
+  * Network-based checking of tokens with fallback to syncronised on-board database.
+  * Detection of door open/closed state via reed switch.
+  * Exit request handling, either opening for a set time or opening as long as in input is held (for our capacitive-touch door handle).
+  * "Snib" feature to hold the door unlocked for an extended period, with automatic timeout.
+  * Remote enable/disable of exit request for additional security.
+  * Remote enable/disable/renewal/timeout of snib state to allow presence detection to trigger timeout of snib state.
+  * Input DC voltage measurement, using low voltage as an indication of battery backup during a power outage. Snib feature can be disabled during power outage to extend battery life (for fail-secure locks).
+Legacy/Stable: The older version uses UDP networking and requires a dedicated wifi network for security. All of the Hacklab doors use this version at the time of writing.
+New: A new firmware and back-end use TLS-enabled TCP networking, so do not require a special wifi network. The modern codebase is better-written, more flexible and features OTA upgrades.