Want to make an interrupt in at89c52...

[ddbrilliant]

My project is on speedometer and gsm alert system if speed goes on 90kmph. Want to make an interrupt which gives a signal if speed>90 and once an interrupt is given it will not consider interrupt for next 15minutes.
Plz suggest me any idea....thanks..

 

[FvM]

Your question makes more sense if you are deleting the word "interrupt" and say "issue a warning". There's nothing pointing to interrupts so far.

To approach a solution, you would primarly ask how the "speedometer" is actually sensing speed, which sensor signals are processed by it and how speed can be derived. Once you know how to make the speed measurement you can implement an alarm state machine on top of the speedometer. And design the GSM interface and control logic that will transport the alarm.

 

[ddbrilliant]

Re: Want to make an alert signal in at89c52...

sir i have complete program for speed measurement and also show it on LCD,,but the next part is giving alert signal to GSM module if speed is goes beyond 90 kmph..i complete that part too but one problem occurring is speed is constantly beyond 90 kmph for few minutes than GSM will send bulking messages..so i want to send only one alert signal and then for 15 minutes signal must not e send even speed is >90..

 

[FvM]

i complete that part too but one problem occurring is speed is constantly beyond 90 kmph for few minutes than GSM will send bulking messages..so i want to send only one alert signal and then for 15 minutes signal must not e send even speed is >90..

If this is your only serious design problem, you're a lucky man. I already mentioned a state machine. The state message_sent will be hold by a timer for 15 minutes.