Initial commit

Author: clockspot

README.md

@@ -1,2 +1,19 @@
 # arduino-nixie
-Code for Arduino Nano in RLB Designs IN-12/17 clock
+Code for Arduino Nano in RLB Designs IN-12/17 clock v5.0
+featuring timekeeping by DS1307 RTC and six digits multiplexed 3x2 via two SN74141 driver chips
+
+This is an alternate codebase that is very much in progress!
+
+## Current feature set
+* Normal running mode
+  * Display shows a simple 4-digit counter, which increments when you press S5.
+* SETUP menu
+  * To enter the SETUP menu, hold S5 for 5 seconds. This is a numbered menu; the small tubes show the current menu item (listed below), and the big tubes show its selected setting.
+  * Press S5 to advance through the items; press S2/S3 to change the setting up and down.
+  * Hold S5 to exit.
+
+### SETUP menu options
+No. | Menu Item | Possible Settings
+1 | Dimming | 0 = Normal running mode (the counter) will display at full brightness<br/>1 = Normal running mode will display dim (25% duty cycle)
+2 | Nothing | Any number from 1 to 7. Has no effect yet.
+3 | Nothing | Any number from 1 to 13. Has no effect yet.