What’s PWM, How to Measure it PWM stands for pulse width modulation which signifies the variable nature of the pulse widths that may be generated from a particular source such as a discrete IC, MCU, or a transistorized circuit. Contentshide 1What's PWM 1.1Peak and Average Voltage 1.2Switc...
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...
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 functionality, which can be integrated into either Yocto or a standalone kernel compilation. This procedure was tested on iMX93 EVK A0 silicon v...
Pulse-width modulation (PWM) dimming is a widely used technique in LED backlight driver systems as it allows the shift in the light spectrum which occurs when the LED forward current changes to be avoided. When dimming is implemented through PWM, the nominal current applied to the LEDs i...
2.1.1. Avoid Ground Return: Differential input oscilloscope should be used, because the BNC negative input in general oscilloscope is connected to the case of the oscilloscope, and the case of the oscilloscope is connected to outside line ground. If use a probe to measure the DC output, it...
Some police are now using a laser technique to measure the speed of cars. This technique is called lidar, and it uses short pulses of light instead of short pulses of radio waves. See How Radar Detectors Work for information on lidar technology. CW Radar vs. Pulse Radar While we've foc...
The primary controller in a voltage regulator is the Pulse Width Modulation (PWM) controller; this controls the phases/pulses of power flowing through the motherboard. A feedback loop in the PWM monitors the power and thermal state of the system, then modifies the outputs of the PWM to ...
pulse width modulation in the inverter. In steady state or slowly varying dynamic conditions, this will work reasonably well, and many motor drives in lower performance applications utilize open-loop speed control, without requiring an encoder. However, there are several disadvan...
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 ...
Due to leakage at the output, the IC must switch to keep the output voltage regulated. Instead of using an IC's IQ as an estimate of the battery's current draw, the designer should measure and use the no-load input current to the system. An even better way to esti- mate the ...