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The folks at Adafruit are busy as a bee working on bringing some of their really cool boards to the Raspberry Pi platform. Here’s a few that came in over the last few days: 16 servos is almost too many Servos require a PWM output but the Raspi only has hardware support for PWM on [...]

Tags:  raspberry pwm adafruit pwm-output busy-as-a-bee servos raspberry  

This week we continue on with another video in our series about how to program for the ATmega328p processor using C. The ATmega328p is at the heart of many Arduino boards. If you have been using them but want to add some more horsepower to your projects, this series of videos is for you. In [...]

Tags:  video series atmega c.-the pwm horsepower heart news  

[hedgehoginventions] wrote in to share a little modification he made to his video card in order to keep it from overheating during strenuous 3D tasks. Having swapped out the stock cooler on his Nvidia 9600GT graphics card, he found that it did not need to utilize the fan while doing mundane things like checking email, [...]

Tags:  fan card converting fan-control pwm graphics-card pcs hacks  

Community collaboration is a great thing. Take the Arduino PWM library for shift registers. Some folks at the Arduino forum pitched in and helped [Elco] trim off a bunch of clock cycles by using the Rotate Over Carry instruction. Now he’s reduced the overhead per shift-register from 108 down to just 43. So far this [...]

Tags:  shift pwm arduino carry shift-registers clock-cycles community-collaboration hacks  

Pulse Width Modulation is definitely the preferred method of dimming an LED with a microcontroller, but we were interested in hearing about a different method called Binary Code Modulation. BCM does the same thing as PWM, it turns the LED on and off very rapidly so that your eye cannot detect a flicker. The brightness [...]

Tags:  led modulation binary pulse-width-modulation pwm microcontroller microcontrollers  

Those following the ProtoStack tutorials will be happy to hear that there is a new installment which explains Pulse Width Modulation. If you’ve never heard of PWM before, it’s a method of generating a signal that is logic 1 for a portion of the time and logic 0 for the remainder of the time. It [...]

Tags:  width pulse modulation pulse-width-modulation pwm remainder microcontrollers  

[dunk] constructed an easy to use AVR-based USB controller with the ability to drive up to six R/C hobby servos at once.  While the USB-powered Atmega8 he used supplies the necessary PWM signaling for all of the servos, an external power supply rated up to 30v at 3A is necessary to provide the 5v of [...]

Tags:  controller usb dunk hobby-servos atmega8 pwm microcontrollers  

[Stan] built this LED matrix using a 16×16 grid of RGB LEDs. He built the hardware and wrote some subroutines to randomize the colors. He’s not using PWM because frame buffering is not feasible for the 1k SRAM limit of the ATmega168 he used. Instead, shift registers drive the lights which can be mixed to [...]

Tags:  led rgb matrix stan tetris shift-registers pwm subroutines microcontrollers  

This peculiar setup allows [Ben Krasnow] to control an alternating current device using one pin on a microcontroller. He’s experimenting with a power drill and has relocated the trigger circuitry that makes it spin. On that board he found a variable resistor combined with a capacitor which control a triac, actuating the speed of a [...]

Tags:  controlling drill pwm ben-krasnow variable-resistor krasnow triac tool hacks  

[Alan] noticed that his external hard drive was getting quite hot to the touch after a few hours. He says that it was probably designed to handle the heat sufficiently, he thought it would be fun to beef it up. He’s using a pic 12f675 microcontroller as the brain and an LM35 temperature sensor. The [...]

Tags:  fan pwm drive alan lm35-temperature-sensor external-hard-drive 12f675 classic hacks