Hauke’s Projects

Playin' around with Electronics and Computers

3D printing

Anything that relates to 3D printing, mainly projects with 3D printed parts in them.

Lessons Learned: Measure Water Levels in a Barrel with SR04-Type Sensors

3D printing, DIY, Electronics, Fundamentals, Home Automation, MicrocontrollerNo Comments on Lessons Learned: Measure Water Levels in a Barrel with SR04-Type Sensors

Using ultrasonic distance sensors I monitor water levels for my garden irrigation system. I have an underground rainwater cistern and a wooden barrel as an interim water storage in the sun to have the water warmed up before use. I started off with the classic HC-SR04 ultrasonic distance sensor, but it turned out to be a bad idea for the warm water barrel: Moisture and temperatures up to 40°C in the summer sun made the sensor rot within half a year down to complete failure. I switched to AJ-SR04M watertight sensor (which seems to be very similar to JSN-SR04T which is often also mentioned on the internet). This has a higher minimum distance (~20 cm vs. ~2 cm), and a much larger opening angle (45° to 75° vs. 15°) as compared to the HC-SR04, and in this post I describe how I dealt with that.

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Quick Thing: TARDIS Housing for Raspberry Pi modded for Raspberry Pi 4

3D printing, Electronics, Media Center, Raspberry PiNo Comments on Quick Thing: TARDIS Housing for Raspberry Pi modded for Raspberry Pi 4

This is just a quick note that I updated my Tardis housing for my media center to now hold a Raspberry Pi 4. The new version features:

  • An improved “POLICE public call BOX” sign
  • A hole for a 5 mm LED in the top for a shining light
  • The necessary holes for USB-C, 2x Micro-HDMI and Audio out
  • A removable top

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Quick Thing: Case for Diamex All-AVR Programmer

3D printing, DIY, MicrocontrollerNo Comments on Quick Thing: Case for Diamex All-AVR Programmer

The Diamex/Tremex All-AVR programmer for ATmel microcontrollers comes as “naked” populated PCB, no case, no protection against shorts or other damage. I created a case for it, with the following design criteria:

  • Protection against accidental shorts as good as possible.
  • Easy access to the jumpers that control the various operation modes.
  • “Park position” for the jumper that de/activates the external power (since it is often in “off” position and can easily be lost).
  • LED signals need to be visible.
  • Uses the existing mounting holes.

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Replacing Fabtotum Hybrid Head v1 Hotend with E3D Lite6

3D printing, Documentation, Electronics, Hardware, Raspberry Pi, Tutorial9 Comments on Replacing Fabtotum Hybrid Head v1 Hotend with E3D Lite6

I replaced the stock hotend of the Fabtotum Personal Fabricator Hybrid Head v1 by an E3D Lite6 hotend (The full metal V6 should work the same way). In this post I describe the steps to remove the old hotend, get in the new hotend and the simple modifications to the firmware that were required.

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Modified Housing for Alber e-motion M25 Remote Control

3D printing, DIY, ProjectNo Comments on Modified Housing for Alber e-motion M25 Remote Control

For a relative that’s paraplegic, I modified the housing of the remote control for the electric wheelchair wheels Alber e-motion M25 to make the usage easier. Mainly, the small housing was made thicker and larger for better handling. Also, one knob was moved to a different position.

The project is not very sophisticated, but I publish it anyhow – perhaps some other handicapped person can benefit from it.

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Convert Window/Door Sensor to Handle Sensor

3D printing, DIY, Home Automation, ProjectNo Comments on Convert Window/Door Sensor to Handle Sensor

In order to prevent my venetian window blinds to go down on timer in front of my open window-style terrace door, potentially locking me out, I needed to know if the door handle was in the “open” position. However, I did not want to use a battery powered radio sensor, but the existing door open/close magnetic sensor in the door frame. Here’s my solution.

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Interfacing EasyMeter Q3M via Info-Interface

3D printing, DIY, Documentation, Electronics, Home Automation, Project, Raspberry Pi, Tutorial22 Comments on Interfacing EasyMeter Q3M via Info-Interface

The installation of my fuel cell heating required a bi-directional power meter. Bonn Netz, my local power network provider, uses meters of type EasyMeter Q3M which have two infrared interfaces: A bidirectional D0 interface, and a read-only info interface. I use the info interface (INFO-DSS) to read out power consumption and production of the three phases. For this, I built an optical interface, a 3D printed housing for it, and use the UART of a Raspberry Pi with python to get the values.

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