PWM control using accelerometer

RE: PWM control using accelerometer

strengthstrong — Wed, 20 Dec 2017 12:08:18 GMT

nrf_drv_pwm_sequence_values_update(&m_pwm0,1,new_pwm_values); seq_id is 1 ,not 0?

RE: PWM control using accelerometer

Rahul — Thu, 16 Nov 2017 04:12:43 GMT

thank you sir using this i can improve my code

thank you so much nordic support team

RE: PWM control using accelerometer

Sigurd — Wed, 15 Nov 2017 13:58:11 GMT

So you can try something like this:

						if(accel_values.x > 0000 && accel_values.x < 8000)
					{  // LED 1 blinking, other led off


seq_values[0].channel_0 = 50;
seq_values[0].channel_1 = 0;
seq_values[0].channel_2 = 0;
seq_values[0].channel_3 = 0;

nrf_pwm_values_t new_pwm_values; 

new_pwm_values.p_individual = seq_values;

nrf_drv_pwm_sequence_values_update(&m_pwm0,1,new_pwm_values);


					}
					
					
					if(accel_values.x > 8000 && accel_values.x < 10000)
					{ LED 2 blinking, other led off

seq_values[0].channel_0 = 0;
seq_values[0].channel_1 = 50;
seq_values[0].channel_2 = 0;
seq_values[0].channel_3 = 0;

nrf_pwm_values_t new_pwm_values; 

new_pwm_values.p_individual = seq_values;

nrf_drv_pwm_sequence_values_update(&m_pwm0,1,new_pwm_values);


					}
					
												
						if(accel_values.x > 10000 && accel_values.x < 12000)
					{ LED 3 blinking, other led off
						
								
								
seq_values[0].channel_0 = 0;
seq_values[0].channel_1 = 0;
seq_values[0].channel_2 = 50;
seq_values[0].channel_3 = 0;

nrf_pwm_values_t new_pwm_values; 

new_pwm_values.p_individual = seq_values;

nrf_drv_pwm_sequence_values_update(&m_pwm0,1,new_pwm_values);
							
					}
					
					
						if(accel_values.x > 12000 && accel_values.x < 14000)
					{ LED 4 blinking, other led off
							

seq_values[0].channel_0 = 0;
seq_values[0].channel_1 = 0;
seq_values[0].channel_2 = 0;
seq_values[0].channel_3 = 50;

nrf_pwm_values_t new_pwm_values; 

new_pwm_values.p_individual = seq_values;

nrf_drv_pwm_sequence_values_update(&m_pwm0,1,new_pwm_values);


					}
					
					
						if(accel_values.x > 14000 && accel_values.x < 16000)
					{ //ALL LED blinking

seq_values[0].channel_0 = 50;
seq_values[0].channel_1 = 50;
seq_values[0].channel_2 = 50;
seq_values[0].channel_3 = 50;

nrf_pwm_values_t new_pwm_values; 

new_pwm_values.p_individual = seq_values;

nrf_drv_pwm_sequence_values_update(&m_pwm0,1,new_pwm_values);


							
					}

RE: PWM control using accelerometer

Sigurd — Wed, 15 Nov 2017 13:12:29 GMT

No examples uses this, but its very easy to use. Declare the static nrf_pwm_values_individual_t seq_values_new[] at top of main.c, after the includes (You are already doing this in the code you uploaded) .

Then you can use it like this to update the PWM duty cycle for the channel you want.

seq_values[0].channel_0 = my_new_value; // New value for channel 0

nrf_pwm_values_t new_pwm_values; 

new_pwm_values.p_individual = seq_values;

nrf_drv_pwm_sequence_values_update(&m_pwm0,1,new_pwm_values);

RE: PWM control using accelerometer

Rahul — Tue, 14 Nov 2017 05:22:10 GMT

is there any example for this ?

RE: PWM control using accelerometer

Sigurd — Mon, 13 Nov 2017 16:17:00 GMT

For the PWM driver, you can use the function nrf_drv_pwm_sequence_values_update() with a new pointer to the new duty cycle values(nrf_pwm_values_individual_t) in order to change the duty cycle.

RE: PWM control using accelerometer

Rahul — Mon, 13 Nov 2017 12:23:26 GMT

yes because i am not able to use remaining 3 channels in different region can you explain how can i use remaining 3 channels in different region

RE: PWM control using accelerometer

Sigurd — Mon, 13 Nov 2017 12:00:31 GMT

If you take a look at the pwm_update_duty_cycle() function, you can see that this function is only changing the duty cycle of channel 0.

RE: PWM control using accelerometer

Rahul — Sat, 11 Nov 2017 04:34:22 GMT

hello sir, what i want to do is for this

if(accel_values.x > 8000 && accel_values.x < 10000)
                {
                    for(int i = 0; i <= 100; i++)
                    {
                        pwm_update_duty_cycle(25);
                    }
                }

one led should glow

and for other loop another led will glow

but for every loop only LED 1 is glowing how can i change this

RE: PWM control using accelerometer

Sigurd — Fri, 10 Nov 2017 15:01:54 GMT

Hi,

What kind of issues do you have ?

I see that you are setting the duty cycle to the same value 100 times in a row. That should not be necessary, E.g:

			    if(accel_values.x > 8000 && accel_values.x < 10000)
				{
					for(int i = 0; i <= 100; i++)
					{
						pwm_update_duty_cycle(25);
					}
				}

So remove these for(int i = 0; i <= 100; i++) loops, .i.e to

				if(accel_values.x > 8000 && accel_values.x < 10000)
				{
							
							pwm_update_duty_cycle(25);
				}