MSP430 Annoyatron

[Brian2898 2]

By popular demand

 

//MSP430 Annoyatron
//Brian Gorman 2011

#include 
int i=0;
void main(void)
{
 WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
 P1DIR |= 0x32;                            // P1.5 output
 CCTL0 = CCIE;                             // CCR0 interrupt enabled
 CCR0 = 32767;
 TACTL = TASSEL_1 + MC_1;                  // ACLK, upmode
 P1OUT = 0x00;
 int flow=0;
 int delays[]= {59,531,259,472,118,59,177,354,177};
 while(1)
 {
   if (i>(delays[flow]))
   {
     P1OUT ^= 0x32;                            // Toggle P1.5
     long z = 65000;                            // Delay
     do (z--);
     while (z != 0);
     P1OUT ^= 0x32;
     i=0;
     if (flow>9)
     flow=0;
     else
     flow++;
   }
   _BIS_SR(LPM3_bits + GIE);                 // Enter LPM3 w/ interrupt
 }
}

// Timer A0 interrupt service routine
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
i++;
_BIC_SR_IRQ(LPM3_bits);
}

:evil:

[geoper2 0]

lol i need to try this its evil :twisted:

thanks for sharing

[bluehash 1,581]

Hello Brian,

If you make a few more posts, You can put this in the Project of the Month contest. Last day is tomorrow.

A video of the Annoyatron would be awesome!

[lastaid 15]

hey brian

 

i just played with your source a little. i really like the annoyatron, wanted to plant one on a friend for quite some time.

i made a little change which would make it completly impossible for someone to anticipate a beep.

it uses a prng to generate the delays rrather then an array, this way its way less predictable.

maximum delay is capped to 511 seconds using the bitshift [ from the 16bit unsigned to a more reasonable value ]

 

have fun

 

#include "msp430g2231.h"


#define PIEZO BIT6



unsigned short lfsr = 0xACE1u;
unsigned period = 0;			
unsigned int getRnd (void);

int i=0;
void main(void)
{
 WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
 P1DIR |= PIEZO;                            // P1.5 output
 CCTL0 = CCIE;                             // CCR0 interrupt enabled
 CCR0 = 32767;
 TACTL = TASSEL_1 + MC_1;                  // ACLK, upmode
 P1OUT = 0x00;
 unsigned int delay = 10;
 while(1)
 {
   if (i>delay)
   {
     P1OUT ^= PIEZO;                            // Toggle P1.5
     long z = 65000;                            // Delay
     do (z--);
     while (z != 0);
     P1OUT ^= PIEZO;
     i=0;

     delay = getRnd() >> 7;
   }
   _BIS_SR(LPM3_bits + GIE);
                    // Enter LPM3 w/ interrupt
 }
}

// Timer A0 interrupt service routine
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
i++;
_BIC_SR_IRQ(LPM3_bits);
}

unsigned int getRnd () {
 lfsr = (lfsr >> 1) ^ (-(lfsr & 1u) & 0xB400u);    
 ++period; 
 return lfsr;
}	

[bluehash 1,581]

Is there any way you could post a video or a soundclip? I'm waiting to hear this. :mrgreen:

[GeekDoc 226]

DEFINITELY making one or two of these! :twisted:

[zeke 693]

Uhm... What is it? :oops:

[gordon 229]

ThinkGeek product page

[Brian2898 2]

[zeke 693]

I'm glad I don't work in your office.

 

I think that thing would drive me to Vlad the Impaler mode.

[bluehash 1,581]

 

hmmm.Did miss it.. I kind of heard only two beeps, or may be I'm missing the point.

[zeke 693]

ThinkGeek product page

 

This description is the one I would fear most.

 

The youtube video triggered my tl;dr filter.

[Brian2898 2]

 

hmmm.Did miss it.. I kind of heard only two beeps, or may be I'm missing the point.

Yeah, it's not a very interesting video. The point is to stash it near a co-worker or something along those lines and over time these beeps will start compounding in their minds and annoying them. Ideally you will want to have a speaker at an annoying frequency.

[lastaid 15]

hi again,

 

fixed my code ^^

 

brian: do you use piezo that automaticly generates a sound? because your code just turn port 1.6 on, then off without any PWM

 

second: as the code uses timerA, can i use a value line device with only one timer to generate sound AND timing with one Timer ?

 

anyway, here is my code, which is completly based on brians code

 

https://gist.github.com/1049184

 

it uses an http://en.wikipedia.org/wiki/Linear_feedback_shift_register to generate the delays and silly wait loops to generate PWM.

 

have fun

[sergiocampama 7]

I'm not really sure how a piezo works, but i think you just power it and it generates sound, so no PWM is needed.

 

I also made a twist to the annoyatron on https://github.com/sergiocampama/Launch ... Annoyatron

it now works only in low power mode, i don't really like whiles to wait. I also set the PIEZO as the green led, because i don't have a piezo with me right now, but changing it to the actual pin is trivial

 

proper credit given to this post