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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.