having a trouble of forgetting to turn on or off your bicycle tail light?
well no more just build an automatic powering switch for the light whenever you riding
for start i had a led shower-head
that i got from my father that switches colors according to the water temperature throughout a thermistor (resistor who change its resistance according to the temp)
so i needed to hack the thermistor (temperature sensor) in order to control the different led colors (blue, green, red) to do so i used a 22kohm variable resistor for checking the resistance of each color and then i could control the led with simple resistor
the last one was blinking red which was a great thing as it save me the use of another component
so i just needed to hook it to a battery and a switch and figure a way to mount it to the seat