Thursday, December 17, 2015

_HowTo: Rotary Encoders & Raspberry Pi

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After having found a simple and reliable solution for a rotary encoder using a PicAXE (see demistifying rotary encoders), I figured that I c...

_HowTo: Demistifying Rotary Encoders

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For a new project, I needed a way to reduce parts and complexity, so it was time to finally bite the bullit and start working on a microcont...
Monday, December 14, 2015

_HowTo: Using a single push-button to start/stop/powerdown the Raspberry Pi

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A while back I did some work by another forum member to incorporate an interesting chip with Raspberry Pi's. It really lacks a "PC...
Monday, October 26, 2015

_HowTo: Adding an Analog Output to the Pi (DAC)

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Here is a post I wrote on the Raspberry Pi forum about adding an analog output to the Pi by using a DAC. Here is that link : https://www.r...

_HowTo: Adding an Analog Output to the Pi (PWM)

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Here is a post that I put on the Raspberry Pi forum about using the Pulse Width Modulation feature to create a (static) output voltage. The ...

_HowTo: Adding an Analog Input to the Pi (ADC)

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I wrote a post on the Raspberry Pi forums about adding an analog input to the Pi by using an ADC. The application I used to describe it was ...
Tuesday, August 11, 2015

_HowTo: Controlling a temperature driven Fan with PWM

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Because I need a fan for my power supply project, I started a little project to do that. I don't like noise or hum, so I wanted to use ...
11 comments:

_HowTo: RPi Start-stop button with shutdown and power-off features

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I recently finished a design, based on an idea from sparkyPi, a raspberry Pi forum member, where he was using a rather special purpose chip ...
Tuesday, August 4, 2015

Building a Dynamic DC Power Load (updated)

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I finally got around to building my own DC Power Load. My noise problems with the DC Power Supply, as described in another post, force...
4 comments:
Tuesday, May 19, 2015

Building a Simple 1KHz Distortion Analysis Tool (upgraded)

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For my audio projects, I wanted to have a method of simply measuring distortion without buying (too costly) or building a (too complex) full...
5 comments:

_HowTo: Triple function button to reboot/halt/reset/restart RPi

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When I got started with my Raspberry Pi, I quickly ran into situations where I needed to reset, restart or halt the Pi. I designed the follo...
Monday, May 18, 2015

_HowTo: Failsafe(r) use of GPIO pin for critical applications

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In an effort to avoid run-away issues with my HVAC system, located on another continend, I wanted to make sure that a crash of the Raspberry...

_HowTo: Simple UPS for RPi

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Quite some time ago I designed this simple but effective battery operated emergency supply. It is used to prevent short brown-outs and also ...
1 comment:

_HowTo: Detailed description of the popular DHT22 temp & humidity sensor

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I wrote this post a while back when I wanted to use this sensor for my thermostat application built around a Raspberry Pi. Here is the pos...

Tuning a 0..30V DC 0..3A PSU DIY kit

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Before you read on, you should know that after building two versions of the DIY kit, I was not very impressed about the stability, noise, bu...
128 comments: