Maxbotic Ultrasonic sensor how to control?

[ober]

Good to hear that.

In that case, you will need to configure the Pin and PWM output and change the duty cycle. But I am assuming PWM is being used for motor speed control, so you do not have any more PWM port.

Anyway, to get analog output, you can apply simple RC low pass filter. A resistor and capacitor will do.

[Light]

Good to hear that.

In that case, you will need to configure the Pin and PWM output and change the duty cycle. But I am assuming PWM is being used for motor speed control, so you do not have any more PWM port.

Anyway, to get analog output, you can apply simple RC low pass filter. A resistor and capacitor will do.

can you give me more details on why i can't use PWM output ? i still got CCP1 and CCP2...haven't used them yet as you can see from the code.

and lets say i want to use RC to get analog output.......all i have to do is send the distance value a any output pin and then connect the RC circuit to that pin ? is that how it is done or more programming is needed ?

thank you

[Light]

any answer ?

[ober]

You can still refer to PR23 sample source code, it uses PWM to control the speed of motor. I am expecting you should know how to connect a RC (resistor and capacitor) circuit to obtain simple low pass filter. You will need to play with the frequency and RC value to get a good analog output.

[luqman hakim]

what does mean this notation...
from PR23 source code..
//max vslue 2.55v = 2.55/5 *1024 - 1 = 522, resolution = 10mV/ inch, 10m/5*1024 =~ 2

i supplied my sonar sensor 5.0 V... so by follow the scaling factor Vcc/512..
the value is 5V/512 = 9.76mV per inch..

[ober]

what does mean this notation...
from PR23 source code..
//max vslue 2.55v = 2.55/5 *1024 - 1 = 522, resolution = 10mV/ inch, 10m/5*1024 =~ 2

i supplied my sonar sensor 5.0 V... so by follow the scaling factor Vcc/512..
the value is 5V/512 = 9.76mV per inch..

The calculation is based on max output voltage from sensor, not the supply voltage of sensor. If you supply with 5V, the max output voltage will still remain 2.55V as stated in the sensor data sheet.

And I do not see the scaling factor of Vcc/512 in the formula given, where did you get this? Especially 512......