Differences

This shows you the differences between two versions of the page.

--- door_access_controllers [2023-02-22 12:07] – [Version 2] tim
+++ door_access_controllers [2023-04-08 10:24] (current) – [PCB ESP32 (draft)] tim
@@ 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.
-==== PCB v4 ====
+===== PCB v4 =====
 https://github.com/timhawes/onyx_robot/tree/or4
@@ Line 73: / Line 73: @@
 | U3 | ESP-12E or ESP-12F |
 | U4 | SPX3819M5-L-3-3/TR |
+===== PCB ESP32 (draft) =====
+This is draft design for migrating to ESP32.
+Goals:
+  * ESP32 series
+  * compatibility with existing wiring
+  * fit into the existing plastic enclosures
+  * nice to haves:
+    * fit existing enclosures better
+    * make wiring easier
+{{:20230407_doorman_esp32.pdf?direct&200|schematic}}
+{{:20230407_doorman_esp32.png?direct&200|}} \\
+(placement and routing isn't finished)
+What's changed:
+  * PCB is bigger, designed to screw into the enclosure as the manufacturer intended
+  * Uses the ESP32-S3-WROOM-1 module
+    * available with large flash/ram
+    * supports circuitpython
+    * supports native USB
+  * USB-C connector (plus optional UART pinout for low-level debugging)
+  * Pluggable 3.5mm terminal blocks for easier wiring (can be replaced with fixed blocks to reduce costs)
+  * MOSFET instead of relay (smaller, cheaper, probably more reliable)
+  * Dropped the PN532 reset pin in favour of a switchable power output (one less wire to manage)
+  * Reader connector has spare pins for existing LED and buzzer, but future readers can be I2C only for even less wiring
+  * Onboard RGB LED (will use with a light-pipe to eliminate the wiring for the current LED)
+  * Onboard buzzer
+  * Exit/Snib/Door inputs replaced with 4 general purpose I/O
+  * One I/O also has a power pin (e.g. to run the touch door handle)
+  * Optional Stemma QT (I2C) connector
 ===== Controller Unit =====
@@ Line 151: / Line 185: @@
 The goal of this version is to make the assembly process easier and more reliable.
-It consists of a laser-cut acrylic plate that fits over a standard 1-gang UK electrical box. A PCB is glued to the inside of the plate, and this PCB includes the PN532, buzzer, LED and connector.
+It consists of a laser-cut acrylic plate that fits over a standard 1-gang UK electrical box. A PCB is glued to the inside of the plate, and this PCB integrates the PN532 module, buzzer, LED and wiring connections.
 CAD files: {{:back-box-1g-20190703.dxf|DXF}}\\
@@ Line 159: / Line 193: @@
 [[https://github.com/timhawes/doorman-firmware|Firmware]] - Arduino C++ built with PlatformIO \\
-[[https://gitea.ehlab.uk/hacklab/doorman-backend|Backend]] - Python 3 asyncio
+[[https://github.com/timhawes/doorman-backend|Backend]] - Python 3 asyncio
 Features: