1 Nov 2020

DIY 3D printing filament dryer

DIY Filament Dryer

How I built a DIY filament dryer from an inexpensive food dehydrator for my Creality Ender 3 V2 3D printer. This houses a standard 1kg spool of filament, allows printing directly from the dryer, and improves print quality and consistency.

18 Dec 2019

Eastron SDM120 power meter Modbus configuration

Eastron SDM120 Title

I’ve been playing with some very cheap, but quite good power meters made by Eastron for a few years now, in particular their compact (single-DIN) single phase Modbus meters.  They are great for cheap (non-commercial) energy monitoring applications. The SDM120M variant has Modbus support for convenient data acquisition and integration. There aren’t the easiest things […]

16 Dec 2018

Murphy’s Technology Laws

Blue Screen of Death (BSOD) failure

Murphy’s Technology Laws! I found on an old hard drive circa 2011 🙂 You can never tell which way the train went by looking at the track. Logic is a systematic method of coming to the wrong conclusion with confidence. Technology is dominated by those who manage what they do not understand. If builders built […]

23 Mar 2018

Extech CO250 Protocol Details

Extech CO250 Protocol Title

Note: This post is currently just some loose notes during my R&D, and is a continuation of the Extech CO250 project. See my Extech CO250 review here. I have RS-232 details and teardown here. Open-source Java library I have a working Java library that reads all values over serial and provides statistics (minimum, maximum, average, […]

22 Mar 2018

Extech CO250 RS-232 details

Extech CO250 Title

The Extech CO250 (AKA Senseair pSENSE RH) is a relatively cheap handheld air quality measurement device with decent features. It measures carbon dioxide (CO2), dry-bulb temperature, and relative humidity, and also provides calculated dew-point and wet-bulb temperatures. One interesting feature, and the subject of this post, is it’s serial communications port. It comes with a […]

21 Mar 2018

Extech CO250 Review

Extech CO250 Kit 2

The Extech CO250 is a relatively cheap handheld air quality measurement device with decent features. It measures carbon dioxide (CO2), dry-bulb temperature, and relative humidity, and also provides calculated dew-point and wet bulb temperatures. After some searching I found what seems to be the OEM device which Extech rebadges. The original device seems to be […]

10 Oct 2016

SCA 300W Power Inverter

SCA 300W Power Inverter Review

In this video we take a detailed look at the SCA 300W Power Inverter and review its performance in detail! I explain what a modified sine wave inverter is and how it’s different from a pure sine wave inverter, and it best applications in the field. * This product was provided to us by Supercheap […]