Before the pandemic, when we started working from home, I used to make coffee a number of different ways, depending how I felt. I liked to experiment – sometimes I would use a V60, others a French Press, coffee syphon or espresso machine. This worked well on the weekends when I had time to experiment a little. However, when you need to grab a quick coffee between meetings, it turned into a real faff; there’s just no matching the convenience (if not the quality) of the office coffee machine.
My solution here was to pick up a Morphy Richards Verve filter coffee maker that I could leave running while I went about my work and come back to when it was done. I was really surprised with this machine, I was expecting to sacrifice a lot of quality for convenience, but with a little fine tuning on ground size and water quantity, its capable of producing some very drinkable coffee.
Occasionally, though, I would get it brewing and forget to go back to collect the drink, leaving it going stale on the hot plate so I decided to see if I could connect it to my network for notifications and control.
I’ve previously mentioned that I wanted to upgrade my heating system so I could program it with more complex timings or control it form my phone. But there’s a catch: The house is rented, so the whole system must do no damage, be made only of removable parts and be installed without modifying any of the existing infrastructure.
In this post, I’ll talk about how I managed it, how it works and what the current state of the project is.
My electric heating is controlled by a Timeguard RTS113 mechanical timer located awkwardly in a kitchen cupboard; it consists of a large outer ring that rotates once every 24 hours. On this ring, you push in red (on) or blue (off) plastic pegs (called tappets in the user manual) at the time you want the heating to turn on or off. As the peg passes a control spindle (representing the current time in the bottom right) it pushes it around approximately one eighth of a turn. Each eighth of a turn of the control spindle, toggles the heating on or off.
A second inner ring allows you to suppress the morning or afternoon schedule for a given day in the week. For example, you can have the heating come on at 6:00am and 7:00pm every day, except on Saturdays where it does not come on at 6:00am because the morning schedule is suppressed.
This works reasonably well, but it’s not very flexible – you pretty much a to live your life on the same schedule every day – if you deviate from it the heating is either wasting power while you’re out, or you’re freezing and have to reach into the cupboard to press the override button.
I’d love to have a smart thermostat such as Nest or Hive but they don’t support my electric heating and as this is a rental house, I’m not able to modify anything to support them.
What I Wanted To Do
The control spindle that is rotated by the pegs has a small slot on the top that can be turned manually using a screw driver to toggle the heating on an off. I can remove all of the pegs and use a stepper motor to very gently turn the spindle each time I want to change the heating state. I could then connect this to a controller that receives instructions from the internet, and write whatever software I wanted to run the schedule.