You just need a sensor to detect the wheel rotation, hall effect, reed relay, IR beam (either broken or reflected) - there are loads of different methods.
how is the IR sensor work?
do I point it at the wheels and it detects motion?
what is making the task a bit difficult is that I cant attach anything to the wheels and also the cart will be used outdoors, so, dert getting on the wheels has to be taken into concederation
how is the IR sensor work?
do I point it at the wheels and it detects motion?
what is making the task a bit difficult is that I cant attach anything to the wheels and also the cart will be used outdoors, so, dert getting on the wheels has to be taken into concederation
hi,
you can calculate the speed using normal ir sensors(and the method is very economical and cheap)
step 1>build an ir sensor
step 2>make sure your wheel has 4 holes in them
step 3>on one side of the wheel make sure you keep ir sensor aligned to the holes and on the other side a white sheet so that a signal a can be sent back to the ir when a hole is detected.
so one rotation the ir sensor goes high 4 times.
if the sensor goes high for 32 times,the number of rotations are 8 (32/4)