I would like to use an HC-SR04 to measure distances. The way that device works is to return a pulse whose length is proportional to the distance being measured (ultrasonic reflection). I saw that there is a way to do this on Arduino (pulseIn - see http://www.instructables.com/id/Dist...
As we can see in the above image the width of the pulses are changing with regard to the instantaneous level of the sine wave. As the sine wave tends to reach the peak, the corresponding width of the pulse becomes wider and vice versa. Using SPWM This indicates that because the sine wa...
(d) Using the FPGA to measure the duty cycle The FPGA has an accurate 40 MHz clock-driven counter resource. The pulse width and period of the PWM wave can be calculated by recording the counter value of the signal along the changing moment, so as to ...
In order to calculate the duty cycle, we need to first find the frequency or period of the variable signal. This can be found with multiple methods, but the initial approach can be to measure the pulse width of the transmitted signal. To do this with an unknown signal, we can connect t...
In order to calculate the duty cycle, we need to first find the frequency or period of the variable signal. This can be found with multiple methods, but the initial approach can be to measure the pulse width of the transmitted signal. To do this with an unknown signal, we can connect ...
Overview This document explains how to use Pulse Width Modulation (PWM) on the iMX93 EVK Board. Attached to this post is a patch to enable this
When you measure the width- because trigger is both edges, how do you know that the first interrupt is the rising? if duty cycle is NOT 50% as here , if the interrupt is will be due the falling you will measure the low width od the pulse.You have to check the cause to the interr...
In the following pages, however, I will show how to digitally divide frequencyandpreserve the original pulse width allowing me to measure signals well beyond the limits imposed by direct counting. Step 1: Digital Frequency Division Traditional digital frequency dividers use flip-flops;this tutorialnic...
Oscilloscopes are commonly used to display one, or a few cycles of a waveform, from which it is possible to measure parameters such as cycle time, pulse width, amplitude, rise- and fall-time etc. On-screen rulers (or cursors) can help to make accurate measurements, and many oscilloscopes ...
I don't have any way to measure across the whole range accurately, but this gives you an idea. The controller board outputs a 9.5 VDC pulse to the solenoid. The solenoid draws about 0.3 Amp. The controller uses a TIP122 transistor (with no heatsink) so you should be able to load it...