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Category: Projects

This category contains all projects.

Bottle Opener for Elderly People or with Disabilities

Posted on 2021-04-25 by Lucky Resistor

Older people often have troubles opening plastic bottles. Also, people with gout or other disabilities lack the required strength to turn the small caps independently. The reason is the small diameter of the caps, which requires a strong grip with just two fingers. There exist a variety of helper tools, assisting this task by increasing…

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Split Storage Boxes Update

Posted on 2021-04-10 by Lucky Resistor

I got many requests to add split storage boxes to my system. Reasons were to print huge boxes and printing boxes on small printer beds. In the past few days, I released an update to my storage boxes system, introducing the first split boxes. If you bought the storage boxes set from my shop, you…

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Comparing Five Turntable Platform Revisions

Posted on 2021-04-05 by Lucky Resistor

To solve the problem with light inference, I tested five different revisions of the turntable platform. For each revision, I recorded the sensor values and compared them to find the best solution. Visual Comparison Revision A is the original with the light inference problem. In the text, I describe only the differences to this original…

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Let’s Print a Cat/Pet Feeding Device (Part 7)

Posted on 2021-04-032021-10-25 by Lucky Resistor

The seventh part of this series is all about the sensor board. It hosts the position sensor and four fill sensors. Speaking of sensors sounds complex, but these are just pairs of IR-LEDs and phototransistors. All design files for the board are in the GitHub repository and if you missed one of the previous parts,…

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Unexpected Fill Sensor Problems

Posted on 2021-03-312021-03-31 by Lucky Resistor

While testing the sensor panel, I ran into unexpected problems, requiring a small redesign. First, let me explain the simple working principle of the fill sensor circuit and what I tested so far. The Circuit The circuit for the fill sensors is straight forward. There are four input lines and one analogue output line. If…

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Project Update: New Stepper Motor Driver

Posted on 2021-03-27 by Lucky Resistor

In this short update, I will talk about the improved stepper driver for the pet-feeder device. While working on the sensor board, to see if the fill sensors work as expected, it also involved using the stepper motor. Here, I realised, the combination of stepper motor and driver I worked with is way too noisy…

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Pet Feeder – Position Sensor Tests

Posted on 2021-03-21 by Lucky Resistor

I worked on testing the sensor board. The first tests I did were about the position sensor. Recap Let me recap the design of the position sensor in the device: The turntable has five position slots, marked red in the following illustration. Behind this slots, there is a small excavation, reflecting the light from the…

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Decorative, Massive, Modular Box

Posted on 2021-02-272022-10-21 by Lucky Resistor

This design is not for everyone. 😅 A decorative and modular, but quite massive box. Built from 3d-printed parts, 5mm plywood panels and plenty 3x10mm wood screws. The instructions in this post show a basic box with the inner dimensions 240×360×84mm, but in the download, you find all files required to build larger boxes in…

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Let’s Print a Cat/Pet Feeding Device (Part 6)

Posted on 2021-02-182021-10-25 by Lucky Resistor

The sixth part of this series is all about the input panel. We will talk about the layout of the front panel, the rotary encoder as the main component and I will explain my example circuit and board. As usual, you will find all required files as a free download from the GIT repository. If…

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Let’s Print a Cat/Pet Feeding Device (Part 5)

Posted on 2021-01-302021-10-25 by Lucky Resistor

In the fifth part of this series, we print the turntable and talk about the back panel of the enclosure. If you missed one of the previous parts, visit the overview page to access them. The Files You will find all required files for the prints in the GitHub repository: About the Turntable Before we…

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