Tuesday, July 7, 2020

Teabot Cord Replacement

When I first built my tea robot, it had an 18 inch long 14/3 SJT cord. I decided to replace it with a 5 1/2 ft 16/3 HSJO cord because the short cord annoyed me.
The old short cord
There are lots of types and sizes of cords that I have learned about. Here's a website I found that has a good guide to cord types:
 https://www.interpower.com/ic/designers/designing-for-export/guides-and-charts/ULCSA-Classification-of-cords.html

The new longer cord

Several of the parts I have added to my tea robot recently have been recycled from a device I took apart. The large water tank, one of the water level sensors, tubing, and cord are all from a neighbor's broken Keurig that I wasn't able to repair. The problem with it wasn't electric or electronic- the pod chamber just wouldn't stay closed. Even if I had been able to fix it, it was annoying because it wasn't compatible with reusable pods.
One water level sensor turns the pump on when there's not enough water in the upper tank. I made a second water level sensor for the lower water tank out of metal skewers (since the probes needed to be food safe), separated by a piece of plastic to prevent short circuits. When the tea robot senses that the lower water tank is empty, it disables the pump and a pink LED lights up to let me know to refill it.

Pink LEDs are rare in most products, but they are becoming common in grow lights.

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