why reed switch,slowly use,no good,hall sensor cheap and good,i use my old car vw passat variant, car odometer back have place add hall sensor but no have digital speed meter no can use,old model, but i add sensor chip same place and take data out my arduino.
odometer inside have many volswagen disck were can take out hall sensor data.
i looking many speed/odometer code but many no good ,i need only speed,odometer,trip meter,and i think add fuel tank potentiometer data too and calculate how much has fuel /km and how much can drive fuel/km.same than all volvo car have.
but no have found anythink good code,im newbie and no understand good all codes what i found at net.
and many have too lot all other,gps,tracker,temperature,other.sd card logger or other what no need old car.
and i looking many make gps odometer,no good no work good and real anytime and true.
all peoples must forget only gps measure odometer,no newer can working good,i know thats good,i use my car last 4 year navigator and no newer have realtime.and right place and true speed.
best have hall or car own speed sensor and gps,and all other together.
gps update only sometime/week./day.reference place mean.
but have vthere somebody good gode simply speed/odometer whit hall sensor?
no found net anythink good what understand and can use
hall sensor have digitall.(better use than analog)guikly .