Bicycle speed-o-meter with a few extra feature like real time clock, automated head- and taillight switching and lithium battery chargeable via micro USB port.

Note	The final hardware wiring and component are not yet decided so current working revision is only exist on a breadboard. Please stay tuned for further updates! Detailed hardware assembly and usage manual will be uploaded!

HW Components:

• Arduino Pro Mini clone 3V3 16Mhz

• 128x64 monochrome OLED display

• a reed switch

• DS3231 real time clock chip based module

• a photoresistor

• any kind of 3.7V lithium battery (I am using a 14500 AA type Trustfire Flame 900mAh lithium battery)

• a micro USB lithium battery charger module

• two tacticle push button

• an on-off switch

• a 10k and a 20k resistor for voltage divider to able to measure battery voltage

• a thermistor

• piezo beeper

Features

• customizable multi information display

• current speed

• battery status

• daily trip counter

• mileage counter

• outside temperature

• current time

• stopper

• timer

• remaining distance and time

• change unit of measurement C / F, mi / km

• speed limit (audible warning with the piezo beeper)

• alarm-clock (piezo beeper)

• alarm with switch off code in case of not permitted removing of the device or moving the bicycle (piezo beeper)

Warning

Lithium batteries are dangerous. Always handle with care.