ESC controlled by MSP430F5529

> but as I've said it works on a servo motor.
So what? Servo motor is not an instrument to measure your pulse widths. Maybe it miraculously works with pulse widths which actually are out of allowed range.

Briceag,

a common ESC for radio controlled models uses the same PPM (PWM) signal as for the servos. Your signal has to

• go high each 20ms (frequency)
• go low again between 1.0 and 2.0ms (duty-cycle) after going high

When using a MSP's timer, then OUTMOD_7 is the best solution for that. This is the reset/set mode. Every time TAR hits CCR1 (or 2 or 3 ...) the output is reset, when hitting CCR0 it is set again. So CCR1 (or 2 or 3 ...) is always smaller than CCR0!

This could be an example configuration with an MSP430G2553:

#include "msp430g2553.h"

void main( void )
{
  WDTCTL     =  (WDTPW | WDTHOLD); // Stop watchdog timer

  BCSCTL1    =  CALBC1_1MHZ;       // Set DCO range
  DCOCTL     =  CALDCO_1MHZ;       // Set DCO step and modulation

  P2SEL      =  0x40;              // P2.6 special function: output PWM TA0.1
  P2SEL2    &= ~0x00;              // P2.6 special function: output PWM TA0.1
  P2DIR      =  0x40;              // P2.6 output

  TA0CCR0    =  20000;             // Period: 20ms @ 1MHz clock
  TA0CCR1    =  1500;              // Duty-cycle for PWM: 1.5ms @ 1MHz clock
  TA0CCTL1   =  OUTMOD_7;          // Reset/set for P1.6
  TA0CTL     =  (TASSEL_2 | MC_1); // SMCLK, up-mode

  while( 1 )
  {
  }
}

This would give you 1.5ms high-time of your 20ms frequency.

Normally ESCs want to start with motor off, so they expect a signal of 1ms which means lowest possible position of your stick. You can play around with this value a little bit. The ESC then makes beeps that mean "OK". Some ESCs have an own configuration setup where you can set an own stick position as start-point. These ESC then often have a button and one or two LEDs.

If the ESC gives you beeps through the motor, then at least something happens :) Maybe it says wrong input signal. An ESC can have different beeps for different problems/states of operation. Isn't there a manual where you can look for your sound pattern?

Dennis

Is it fully charged? Depending on it's charging state and the C-rating of your battery the voltage drop might be to high with the flowing current. Or the problem is somewhere else. What you can try: Build a circuit like this

and put it between your phases of the ESC and see if it switches off, too. Then it is not the load that causes the ESC to stop operation.

Dennis

Hello,

Where exactly can I put it? I mean, the Esc has three wires.