Differences

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--- door_access_controllers [2019-04-29 17:50] – tim
+++ door_access_controllers [2019-09-22 22:08] – tim
@@ Line 5: / Line 5: @@
 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 =====
+===== PCB v2 =====
-https://github.com/timhawes/onyx_robot/
+https://github.com/timhawes/onyx_robot/tree/or2
 ^ Reference ^ Component ^ Farnell ^
@@ Line 33: / Line 33: @@
 Errata: a generic through-hole flyback diode should be fitted between GND and 12V_OUT, on the underside of the screw terminal.
-==== Lessons Learned ====
+==== PCB v3 ====
+  * Off-the-shelf DC-DC converter instead of custom circuit
+  * Split voltages 5V (for piezo and NFC module) and 3.3V for ESP8266
+  * Flyback diode on 12V switched output
+  * TVS diodes removed
+  * Normally-closed relay option removed
+  * Pull-up removed from piezo
+==== Future ====
+Future versions may use the Wemos D1 Mini to aid maintainability. Alternatively, the next design may use the more powerful ESP32.
-Future PCB revisions are likely to be based on a Wemos D1 Mini module to reduce component count and allow easier debugging. The onboard DC-DC converter will be replaced with an off-the-shelf "LDO replacement" DC-DC converter module.
 ===== Controller Unit =====
@@ Line 109: / Line 119: @@
 ===== Software =====
-Two versions of firmware and server back-end are currently in operation.
+Features:
-Common features:
   * Ability to read any 13.54MHz ISO-14443 Type A token including MIFARE Classic/UltraLight and NFC tags.
@@ Line 121: / Line 129: @@
   * 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).
+  * TLS-enabled TCP networking with OTA updates.
-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.