Author Archives: James

Temperature Monitoring

About a year ago I decided it would be a good idea to monitor the temperature in different rooms in the house and outside. The motivation was that, later, I might start controlling the heating by computer and the data would be useful.
When we moved in I had already devoted some time and energy to [...] Continue reading

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Relay Board Parts List

Here is the parts list for the relay board, since I forgot to include it in my last post.

1 × 9480021 Relay
2 × 9341102 1K Resistor
1 × 9339060 10K Resistor
1 × 9565124 Diode 1N4148
1 × 9558420 NPN Transistor 2N3904ZL1G
1 × 1142502 3mm LED
1 × … Continue reading

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Relay Power Control

I could control the mains using a Triac and will probably try an experiment with that later. But using only components that I understand means a relay. So, following the excellent description on SparkFun you end up with a simple circuit with a NPN transistor that switches on the coil of a relay. The description [...] Continue reading

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Power Supply

The approach I’m going to take with this project is to design and build each part of the mains controller as independent circuits and evaluate / play with them. When I have them all hooked up in a way that works and that I’m happy with, then I can draw a schematic and board layout [...] Continue reading

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A Plugin Mains Socket Controller

I’ve thought of a new project. I’m going to build a plugin controller for a mains power socket. This will replace the cheap ones that I have around the house. Continue reading

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