Author: John

1,500,000,000 the Epochening

Don’t forget that at 2:40am, 14 July 2017 (UTC) the Linux epoch will hit 1,500,000,000 (1.5 Gigaseconds). Visit https://www.john.geek.nz/epoch to watch the excitement! It hit 1,000,000,000 back in September 2001 and it won’t hit 2,000,000,000 until May 2033.

Posted in General Randomness, Linux Tips

Modifying float voltage of a TP-SCPOE-1224

Adjusting the float voltage of a Tycon Systems TP-SCPOE-1224 The Tycon Systems TP-SCPOE-1224 is a Solar and Power over Ethernet powered DC UPS. You connect it up to a 12v battery, power it over ethernet, add an optional solar panel

Posted in Uncategorized

Power meter optical pulse detection

I’ve always planned to monitor my electricity usage. I had previously (about a year ago!) ordered some power transformers from seeedstudio and a six channel ADC for simultaneous three phase current and voltage measurement but never got around to starting

Posted in Electronics, Embedded Systems, Power monitoring, Projects, Wino-Board

Wiring up the ESP8266

Before you can program the ESP8266, you need to wire it up. First things first, the ESP8266 uses a 2mm pin spacing so you can’t use a standard breadboard as these use a 0.1 inch spacing. It also uses 3.3V

Posted in Electronics, Embedded Systems, ESP8266, Projects

Introducing the ESP8266

About a year ago I put up some money for the Wino-Board kickstarter project, received my Wino-Boards and did nothing with them for 12 months. They are effectively a tiny Arduino board attached to the innards of an ESP8266 WiFi

Posted in Electronics, Embedded Systems, ESP8266, Projects, Wino-Board

Fridge Wiring

My Humidity controller finally arrived this morning so I’ve started wiring up the control box.

Posted in Cheese Fridge, Projects

Fans in the Fridge

I’ve finally found a bit of time to get my fans installed in the fridge. I’m still waiting on the humidity controller to arrive from China. Everything else took about 8 days to arrive, but the humidity controller has so

Posted in Cheese Fridge, Projects

Drilling vents in the fridge

When I was investigating the wiring diagram of my fridge freezer, I was also trying to find out if there is anything important in the divider between the fridge and freezer. Based on the diagrams I was confident that there

Posted in Cheese Fridge, Projects

Ordering parts for the cheese fridge

After working out how my fridge works, I’ve now decided what I’m going to do to make it into a cheese fridge.

Posted in Cheese Fridge, Projects

Understanding how a fridge freezer works

The fridge I’m using for my cheese fridge is a fridge freezer, this means that during normal operation, the two boxes are different temperatures – around 20 degrees C. I want both the fridge and freezer to operate at the

Posted in Cheese Fridge, Projects