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victorcastro89
Joined: 31 Oct 2011
Posts: 11
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| HELP Speed Measuring for Brushless with sensor hall effect |
 Posted: Tue Nov 15, 2011 7:33 pm |
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I'm trying to do a speed meter, using three Hall-effect sensors 60 degrees out phase.
To do this just need to know the time between two edges of ascent or descent of the sensors.
The curves are as follows:
To measure the time between two edges thought about using 3 external interrupts, but first simulate in Proteus Isis a program to test such interruptions.
| Code: |
#include <18F4550.H>
#fuses HSPLL, PLL5, CPUDIV1, NOWDT, noPUT, BROWNOUT
#use delay(clock=48000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#INT_EXT
void inter0()
{
printf(" int0 ");
}
#INT_EXT1
void inter1()
{
printf(" int1 ");
}
#INT_EXT2
void inter2()
{
printf(" int2 ");
}
main()
{
//setup_timer_0 ( T0_INTERNAL | T0_DIV_1); // 1 contagem 666.666ns
enable_interrupts(INT_EXT);
enable_interrupts(INT_EXT1);
enable_interrupts(INT_EXT2);
clear_interrupt(INT_EXT);clear_interrupt(INT_EXT1);clear_interrupt(INT_EXT2);
enable_interrupts(GLOBAL);
while(1);
}
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When time between interrupt was 8ms worked properly. But when I used a time of 1ms, it only worked if I used only two hall effect sensors.
Anyone have any better suggestions for measuring the speed of this Brushless Motor, or a solution to my problem?
Thanks! |
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temtronic
Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario
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| Posted: Tue Nov 15, 2011 7:51 pm |
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problem #1 is Proteus..full of bugs ,errors and bad DRCs.
problem #2, ADD 'errors' to the USE RS232(...) options.
problem #3 , printing within an ISR is very, very bad programming.
ISRs are meant to be short and sweet. Set a flag and get out FAST ! |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Wed Nov 16, 2011 12:14 am |
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| Think again! Serial output of 6 characters @ 9600 Baud takes about 6 ms. |
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