Category Archives: Design

Magnetism Detector | Project 12/20 | Maxitronix 20in1 | Learning Electronics In The Lab With Jay Jay

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This post is part of my video blog and you can find more information about this video over here.

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In this video I do the 12th project from the Maxitronix 20in1 (the Sensor Robot 20): Magnetism Detector.

In this project we control a BJT transistor with a magnetic reed switch.

We use the thermal camera to observe heat in the transistors and LEDs during operation.

This is a plain DC circuit with no signals so there was no call for measuring anything with the oscilloscope.

I got myself a little confused about normally open and normally closed circuits during the video, but I think I was clear enough about that in the end.

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ESP-NOW instead of WiFi

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Today I learned about ESP-NOW over here: Forget WiFi! This Wireless Method is WAY Better?

This looks like exactly what I need for a project I’m planning. I want to connect my WiFi router with a relay between its power source. I can then trip the relay to reboot the router. I need to do this every couple of months and doing it manually is a pain because I have to walk into the other room to do it.

555 timer

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One day I intend to Build My Own 555 Timer.

In the recent past I posted How a 555 Works as a Timer which refers to an interesting video on the topic.

In that video the speaker gives us a mnemonic for remembering the transistor schematic symbols. Referring to the direction of the arrow on the symbol the “NPN” transistor “Never Points iN”. Good to know!