Differences

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

--- door_access_controllers [2019-09-22 22:08] – tim
+++ door_access_controllers [2020-08-13 17:37] – 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 v3 ====
+==== PCB v4 ====
-  * Off-the-shelf DC-DC converter instead of custom circuit
+https://github.com/timhawes/onyx_robot/tree/or4
-  * 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 ====
+  * Removed custom 12V-3.3V converter circuit
+  * Replaced with standard 12V-5V converter and 5V-3.3V LDO
+  * I2C devices running on 5V instead of 3.3V
+  * Removed LED series resistor (appropriate resistors must be used at installation time)
+  * Replace relay diode with M7
+  * Added flyback diode to 12V relay output
+  * Removed ESD protection diodes
+  * Removed 3.3V connection from FTDI connector
+  * Solder jumpers for no-volt relay output
-Future versions may use the Wemos D1 Mini to aid maintainability. Alternatively, the next design may use the more powerful ESP32.
+^ Reference ^ Component ^
+| C1 | 0805 10uF 25V |
+| C2 | 0805 10uF 10V |
+| C3 | 0805 10uF 6.3V |
+| C4 | 0603 0.1uF 6.3V |
+| D1 | S1M+ |
+| D2 | S1M+ |
+| JP1 | PCB male header 2.54mm pitch 3-way |
+| JP2 | PCB male header 2.54mm pitch 2-way |
+| P1, P2, P3 | PCB screw terminals 5.08mm pitch 2-way (9 total) |
+| P4 | PCB male header 2.54mm pitch 6-way |
+| Q1, Q2 | MOSFET-N SOT-23 (e.g. On Semi FDV303N) |
+| R6 | 0603 10K |
+| R7 | 0603 31K6 |
+| R8 | 0603 2K2 |
+| R9 | 0603 10K |
+| R10 | 0603 10K |
+| R11 | 0603 10K |
+| R12 | 0603 4K7 |
+| R13 | 0603 4K7 |
+| R14 | 0603 10K |
+| SW1 | EVQPT5 tactile switch |
+| U1 | Recom R-78E5.0-1.0 |
+| U2 | Songle SRD-12VDC-SL-C |
+| U3 | ESP-12E or ESP-12F |
+| U4 | SPX3819M5-L-3-3/TR |
 ===== Controller Unit =====
@@ Line 55: / Line 83: @@
   * [[http://cpc.farnell.com/kingbright/rtf5010/led-clip-prominent-5mm-pk25/dp/SC08862|5mm LED bezel]]
   * [[http://cpc.farnell.com/unbranded/r13-502ma-05-b/switch-black-push-button-spst/dp/SW03314|push-button switch]]
-  * Laser-cut mounting plate: {{:nfc-controller-mount-20150925.dwg|DWG}} {{:nfc-controller-mount-20150925.dxf|DXF}}
+  * Laser-cut mounting plate: {{:nfc-controller-mount-20150925.dwg|DWG}} {{:nfc-controller-mount-20150925.dxf|DXF}} [TODO: v4 PCB requires a new mounting plate]
 {{:nfc-controller-20151031-231947.jpg?200|}}
@@ Line 77: / Line 105: @@
 ===== Reader Unit =====
+==== Version 1 ====
 CAD files: {{:nfc-reader-20160626.dwg|DWG}} {{:nfc-reader-20160626.dxf|DXF}}
@@ Line 89: / Line 119: @@
   * 3mm blue LED
-  * 120R resistor (this is low, but an additional resistor is used on the controller PCB)
+  * 120R resistor (or higher)
   * [[http://uk.farnell.com/multicomp/mcabt-456-rc/audio-element-piezo-9-5khz-12mm/dp/2433032|12mm piezo disc]]
   * [[http://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=90_93&products_id=2242|PN532 module]]
@@ Line 116: / Line 146: @@
 Test the reader and controller together before securing the reader to the wall with double-sided adhesive foam tape.
+==== Version 2 ====
+In progress.
 ===== Software =====