HomeKit compatible laser trip wire.

Building a HomeKit Compatible Laser Trip Wire With CircuitPython

This post describes how to build a HomeKit compatible electronic trip wire to detect motion. As opposed to the more common infrared motion detection, there aren’t many options for detecting movement by interrupting a line of sight between two points. There are some alternatives that use infrared diodes, but those are limited by a maximum distance of just a few inches/feet between the emitter and the receptor. This project attempts to solve that limitation by using a regular laser emitter and a photo transistor as a receptor, so that the maximum distance is only dependent on the laser’s output power and your ability of aiming it to the photo transistor from afar....

June 13, 2019 · 8 min · L.R-S

Building a Standalone GPS Logger with CircuitPython

I’ve been fascinated by the GPS technology for years. There is something magical about being able to accurately pinpoint one’s position on the globe at any given time. Having that capability currently integrated in our phones is even more remarkable and something that we usually take for granted. The downside, however, is that accurately tracking our position is very taxing on our phones and severely impacts their battery life. I wanted a small standalone device capable of doing just that....

April 3, 2019 · 6 min · L.R-S

How to Backup Photos While Traveling With a Raspberry Pi - Part IV

Background Information This is the fourth part - and perhaps the last one - of a series of posts on backing up photos while traveling using a Raspberry Pi (RPi) and iOS devices. Here are the links to previous posts. Part I: Initial setup and basic Python backup script. Part II: Using iOS today widgets to handle the backup process. Part III: Using the Raspberry Pi’s Sense HAT to handle the backup process....

September 20, 2018 · 4 min · L.R-S

Bluetooth Controlled RGB LED Matrix

Project Overview If you like colorful and flashing LED lights, you are going to love this project. I’ve been looking for a small, rechargeable and powerful RGB LED matrix for a while. The idea is to use it for regular product photography, as an on-camera flash and/or as a fill video light. There are some nice products on the market, but they fall short on some of the specs, didn’t fit all my needs or just were too expensive....

July 29, 2018 · 8 min · L.R-S

Touch Screen Thermal Camera with Adjustable Temperature Range

Project Overview This project was inspired by the Thermal Camera with Display project from Adafruit. Ever since they announced the AMG8833 IR Thermal Sensor, I wanted to use it to build a thermal camera for checking hot spots on electrical panels around the house and looking for rabbit nests in the backyard. Although the project is very similar to Adafruit’s on the hardware side, I modified the Arduino (C language) code extensively to adapt it to my needs....

April 29, 2018 · 4 min · L.R-S