KlaxSAN was created as a rogue installation for EMF Camp 2022. Free-standing hand sanitizing station that makes a loud "toot" when used. The hope is to surprise and amuse people.
Only makes noises at specified times to prevent being too much of a nuisance ("Thank you for being responsible with your irresponsibility").
Remote controllable / reconfigurable using Bluetooth serial app from smartphone.
- Pedestal fabricated from 4mm plate steel
- Brains: Arduino nano with firmware from this repo
- Switch: 30A DC relay module
- Remote: Bluetooth HC-05 module (plus 3.3/5V logic shifter for comms with BT module)
- Time: DS1302-based RTC module
- Main power: 12V lead acid leisure battery
- Electronics power: Large USB power bank
- Noise maker: multi-tone car horn
Electronics was powered separately from horn to prevent inductive spikes from frying things.
Bluetooth module should be configured with pairing PIN prior to use with KlaxSAN. Pair and use BT serial to send commands / receive responses. During development it looked as though BT module was buggy and didn't allow for change of PIN from the defaut of 1234. Therefore there is a secondary AUTH command to perform authorization after connection, without which other commands will not function.
ARM Arm KlaxSAN
AUTH<buildtimecode> Required before other commands will function (60 sec timeout)
BEEP# Manual toot for # milliseconds
COOL# Set cool down setting (seconds)
CLRn Clear active slot n (0-9 or * for all)
DEAUTH Revoke authorization immediately
DISARM Disarm KlaxSAN
LIST Print list of active time slots
PROB# Set probability (percent) of toot per press
SETn=ddhhmm-ddhhmm Set slot n to be active between specified day, hour and min
STAT Print current status
STIMEddhhmm Set RTC to day hour and min
Response will generally be "k" (for OK), and "?" with some second letter suffix to indicate problems.
Build with Arduino Makefile.
export AUTH_CODE=passphrase
make
make upload
Alternatively, edit Config.h, and add some #define AUTH_CODE value and then build with Aruino
IDE thing.