Differences

This shows you the differences between two versions of the page.

--- projects:fridgehack:writeup [2022/06/08 15:11] – spsmith
+++ projects:fridgehack:writeup [2022/06/08 16:29] (current) – spsmith
@@ Line 1: / Line 1: @@
-==== Brass Monkey Fridge Hack ====
+==== Fridge Hack ====
 === Main Article ===
-This story begins with some fridges that had been returned to the retailer for various reasons. \\
-The fridges are Brass Monkey branded and they are retailed through Jaycar Electronics, an Australian\\
- electronics retailer, as well as RTM (Road, Traffic and Marine), an Australian outdoors retailer. \\
-RTM happens to be owned by Jaycar Electronics. The two retailers share some other products between them, \\
-but that's neither here nor there. \\
-Because Jaycar stores couldn't feasibly return the 'dead' fridges to their head office in Rydalmere, \\
-they opted instead to just keep them lying around at their stores taking up space. At some point the \\
-manager got fed up with this arrangement and decided to just leave them outside the shop overnight. \\
-Before doing that however, they irreversibly removed the controller/displays, assuming this would \\
-render them 'unserviceable'. \\
-Enter the crafty sales assistants.\\
-After finding the data sheet for the compressor controllers, it was discovered that the compressors \\
-are low voltage 3 phase units. They have a controller on the side of the compressor body that houses \\
-all the smarts to make it work. It turns out that the displays are nothing more than a thermostat controller. \\
-A simple way to choose set points and so forth. \\
-The data sheet showed us that by bridging pins, 'C' and 'T', we could call for the compressor to start. \\
-That was a great discovery on its own, but the data sheet revealed more. It suggested the controller could\\
-drive the compressor at different speeds! This function was not being utilised in the fridges being sold. \\
-All fridges, as sold, were running at their lowest speeds, 2200RPM, probably in a bid to ensure the fridges \\
-lasted for as long as possible.
-We saw an opportunity to not only get these fridges running, but also drive them