Help: Solution for Detecting the No of persons sitting on a seat

Hi Bashir

Here is an idea. I am going to assume that only one person at a time can add their body to the bike. We are going to put a pressure sensor, like an bladder into the seat and connect it to a pressure sensor. We are not going to be concerned with specific pressures as people sit on the seat but rather we will detect pressure plateaus. We will use a micro processor to count the pressure plateaus. For example the first person sits on the seat and a max pressure, that is stable for a second or two, is detected. The next person sits on the seat and a second pressure plateau is detected, which is also stable for a second or two. Finally if a third or fourth pressure plateau is detected then the microprocessor disengages the ignition. You would have to program the processor to test for any pressure that falls within a range plus or minus "x" Kpa for a second or two. If a second greater pressure is then added and stabalizes for a second or two we have our second person. Then if a third higher pressure is obtained we have our prevent ignition point. You will have to make sure that there is a fail safe so that once the bike is started and moving that the ignition shut down can not happen as the bike and people bounce over rough terain. Perhaps a timer that takes the shutdown out of the picture once the bike has been started and moving for 5 seconds. Good luck

John

Agree, also the fail safe is a good idea.

I get the feeling though that some things shouldn't be solved by electronics, and could be solved by other means (e.g. change mindsets like how drink-driving has plumetted over the years).

There could be an emergency where several people did need to get on a bike, and then the electronics would prevent that, so this seems wrong :-(

One project I knew considered licensing, but we removed any software lock on the product because there was always the risk that someone might need to use it in an emergency. Not sure it's easy to sleep at night knowing there is this risk with a product one rolls out. So it was accepted that there would be some abuse, and the lockout function was removed.

@shabaz I agree but some times just waiting for things to happen and if they happen can be quite boring except when you provide government a tool to act to this. I consider these thoughts only once i am sure i have the perfect solution to make such a thing after that only i think whether to implement it or not. Before even making if i think of its disadvantages i would end up doing nothing.

The programming part can be manipulated in any direction ways can be devised that will allow to put the system in sleep in case of emergency.

Hi Eeshan,

That's good, just wanted to be sure you've checked it off. The project I saw, had spent a lot of time and effort in the lockout, only to remove it all entirely because it wasn't practical/usable for social reasons as John says.

Hi Eeshan,

That's good, just wanted to be sure you've checked it off. The project I saw, had spent a lot of time and effort in the lockout, only to remove it all entirely because it wasn't practical/usable for social reasons as John says.