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Category: electronics

LEDCircleClock Revisited

LEDCircleClock Revisited

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A good friend of mine (Milo) was featured last year on Hackaday with a post about building a circular LED clock. See Milo’s GitHub repository for the original code/version and build instructions. I did build his project, and added some more effects / animations / features. For this new extended version, see my GitHub repository: https://github.com/atkaper/LEDCircleClock . I did not 3d-print the proper case for the clock yet. For now I just put it in a picture frame, with a…

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Macro Keypad

Macro Keypad

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I thought that since working from home those last two years, it would be a nice gadget to have a toggle button to enable/disable the microphone when using MS-Teams for online video meetings. But a macro keypad with just one button is a bit silly, so I decided to go for 8 buttons. I did not really think too deep, and came to these functions for now:  toggle microphone in ms-teams.  toggle video in ms-teams.  open a…

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Telephone Microphone To XLR Conversion

Telephone Microphone To XLR Conversion

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My brother needed an old telephone handset to be connected to an audio amplifier, to use as microphone for his band. They were aiming for this old (fuzzy) telephone sound to use in one of their songs. After a bit of searching, I came across some instructables (see references at bottom of page), and combined and simplified them a bit, and put the stuff together. Parts list: XLR Male Connector, to connect to a “real” audio microphone cable. Small 600…

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Light Triggered Fan Timer

Light Triggered Fan Timer

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Intro: A small weekend project, using my favorite ESP8266 (WeMos D1 Mini) controller – A Light Triggered Fan Timer – to keep the air in the smallest room fresh – but also suitable for a bathroom to remove moist air from the shower.Of course you can buy a ready-made fan, which connects to your light, and will run for half an hour when you turn the light on. But… that’s just too easy / no fun, and when building this…

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Glowing Bottle

Glowing Bottle

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My daughter is quite artistic (as any proud parent would say), and created a wire animal in a bottle. For this bottle she wanted some lights at the bottom (inside), but… the requirement was that no wire may go through the glass (which would have made everything lots easier of course). By total coincidence, some weeks earlier I did order some wireless power transfer kits. They contain two coils and two little electronics regulator boards to send and receive wireless…

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WiFi 240V AC Led Dimmer – Speech Controlled

WiFi 240V AC Led Dimmer – Speech Controlled

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I wanted to build my own WiFi dimmer, to connect my dinner table lights to Alexa (Amazon Echo Dot). The used parts are an ESP8266 (I used a Wemos D1 Mini Clone), an ATTiny45, some sort of power module to supply 3.3 volt, and a zero-cross-detector / Triac dimmer module.

Duplicate unprotected Mifare Classic NFC Card

Duplicate unprotected Mifare Classic NFC Card

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Where I live, they have changed the way they pickup garbage. Only plastic, paper, and green-stuff will be picked up (in separate bins). And the ordinary (formerly grey) trash you need to bring to one of the central bins in the neighborhood (and glass you have to bring to the bins at the shopping mall). So, those central “grey” bins… to prevent just anyone from dropping stuff in there, you need to use an RFID badge to open it up….

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Sonoff Firmware Update – Lava-lamp Switch

Sonoff Firmware Update – Lava-lamp Switch

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I have a lava-lamp, which should not be on for more than 5 or 6 hours at a time. So I decided to move it from switching on/off manually to something a bit more automated. For this I reprogrammed a Sonoff WiFi switch (based on the ESP8266). Now it can be controlled via voice commands (via Alexa / Amazon’s Echo Dot), and via some simple CURL (Wifi) command line call’s. The curl’s are put in a cron (timer) process on…

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Antique Game Button Setup

Antique Game Button Setup

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Today I was cleaning out an old moving-box, and found a very old small project of mine 😉 It’s a set of game / quiz buttons, which record who did press first. There were only two buttons connected, but the circuit was suitable for 4 of them (two were cut off). There’s no circuit diagrams or software available, it’s just a bunch of images and movies to show the old stuff. It’s a simple setup, you can almost guess the…

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