Category Archives: Dawnclock

Waking up with an RPi – pt.5: summing up

  The dawn clock is working well. To recap, here’s how it works: And here’s a basic description of how it works (more info & functions in previous posts): One hour before alarm time (configurable), the first LED is switched on. Subsequent LEDs are switched on at the rate of one each minute. To simulate dawn, the first 8 LEDs are… Read more »

Waking up with an RPi – pt.4: software

The software for the dawn clock is written in Python. And no, I’m not going to upload it to GitHub, or anywhere else for that matter. There are two reasons for this: first, it needs work still; and second, it would take too much explaining, not least because it uses loads of my hand-rolled libraries and classes for the Raspberry… Read more »

Waking up with an RPi – pt.3: audio

My first big disappointment with the Raspberry Pi was the audio output from the headphone jack. When I built my first dawn clock, using an Arduino, I had to buy a separate shield for audio output, and even that was severely limited. With the RPi, I thought, life will be easy because all the audio stuff I need is built-in…. Read more »

Waking up with an RPi – pt.2: lights & sensors

One of the problems with my Arduino-powered dawn clock was that 10 LEDs just don’t put out enough light. I wanted a lot more for the Mk.II, but that then raises the issue of how they are controlled. Cascading shift register ICs would be one way to go. I decided, instead, to go with I2C port expanders. I selected the… Read more »

Waking up with an RPi – pt.1: introduction

I don’t like waking up. I need easing into the day, slowly and carefully, especially in Winter. My wife is the same, which is why she bought a ‘dawn clock’. This is an alarm clock with a light that fades up slowly, over the course of 90 minutes, before sounding the alarm. It’s a fine device and we still use… Read more »