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Articles from Limpkin’s blog

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Radiation Pattern Measurements in an RF Anechoic Chamber

From www.limpkin.fr 1 year ago in Blogs

Very few are lucky enough to use such a piece of equipment... so I figured I'd share this experience with you! Let me first start this write-up by apologizing for the lack of recent articles. As you can imagine, I've...

Project In A Day: When Is My Next Bus?

From www.limpkin.fr 2 years ago in Blogs

Made using only components from my stock ! Why This Project? For once, this project was not for me... it was for my wife ! Every morning she takes the bus then train to go to work. If she misses...

Project In A Day: When Is My Next Bus?

From www.limpkin.fr 2 years ago in Blogs

Made using only components from my stock ! Why This Project? For once, this project was not for me... it was for my wife ! Every morning she takes the bus then train to go to work. If she misses...

Making the Electronics for a 24GHz Doppler Motion Sensor

From www.limpkin.fr 3 years ago in Blogs

I couldn't believe my eyes when I saw how tiny that sensor is! The Doppler Effect I'm sure you're quite familiar with the Doppler effect: you send an RF signal at a given frequency to a target, and if this...

Making the Electronics for a 24GHz Doppler Motion Sensor

From www.limpkin.fr 3 years ago in Blogs

I couldn't believe my eyes when I saw how tiny that sensor is ! The Doppler Effect I'm sure you're quite familiar with the Doppler effect: you send an RF signal at a given frequency to a target, and if...

A Mass Programming Bench for ATMega32u4 MCUs

From www.limpkin.fr 3 years ago in Blogs

Or how to try to spend as little time as possible programming several thousands MCUs.... Why.... Just Why? As you may know I started the Mooltipass offline password keeper project more than 2 years ago. Together with a team of...

A Mass Programming Bench for ATMega32u4 MCUs

From www.limpkin.fr 3 years ago in Blogs

Or how to try to spend as little time as possible programming several thousands MCUs.... Why.... Just Why? As you may know I started the Mooltipass offline password keeper project more than 2 years ago. Together with a team of...

A Small Collection of NodeMCU Lua Scripts

From www.limpkin.fr 4 years ago in Blogs

I usually never use libraries... but made an exception for these quick projects ! I'm pretty sure that most people reading this very article know about the (very) cheap ESP8266 Wifi module. A bit more than a year ago, I...

A Small Collection of NodeMCU Lua Scripts

From www.limpkin.fr 4 years ago in Blogs

I usually never use libraries... but made an exception for these quick projects ! I'm pretty sure that most people reading this very article know about the (very) cheap ESP8266 Wifi module. A bit more than a year ago, I...

High Voltage Power Supply for Nixie Tubes

From www.limpkin.fr 4 years ago in Blogs

It's always fun playing with dangerous voltages ! The Idea For quite a while I've had this project idea in the back of my head that would involve using many Nixie tubes. These funny looking cold cathode displays were actually...

High Voltage Power Supply for Nixie Tubes

From www.limpkin.fr 4 years ago in Blogs

It's always fun playing with dangerous voltages ! The Idea For quite a while I've had this project idea in the back of my head that would involve using many Nixie tubes. These funny looking cold cathode displays were actually...

An Open CVMeter

From www.limpkin.fr 4 years ago in Blogs

Did you know that most ceramic capacitors lose up to 80% of their capacitance near their voltage ratings? The Idea Not every electronics enthusiast knows that a ceramic capacitor's capacitance changes with the voltage you apply to it. This can...

An Open CVMeter

From www.limpkin.fr 4 years ago in Blogs

Did you know that most ceramic capacitors lose up to 80% of their capacitance near their voltage ratings? The Idea Not every electronics enthusiast knows that a ceramic capacitor's capacitance changes with the voltage you apply to it. This can...

A Connected Lamp to Wake Me Up

From www.limpkin.fr 4 years ago in Blogs

I've always wanted to play with these 10W RGB LEDs! The Idea So for some reason I bought 2 IKEA lamps at a flea market. As IKEA furniture has a long history of being hacker-friendly, I figured they shouldn't be...

A Connected Lamp to Wake Me Up

From www.limpkin.fr 4 years ago in Blogs

I've always wanted to play with these 10W RGB LEDs! The Idea So for some reason I bought 2 IKEA lamps at a flea market. As IKEA furniture has a long history of being hacker-friendly, I figured they shouldn't be...

A Timeless Fountain

From www.limpkin.fr 4 years ago in Blogs

This is one of these "just because" projects... The Idea I'm sure that most of you are familiar with the stroboscopic effect. To paraphrase wisegeek, it is a phenomenon of human visual perception in which motion is shown to be...

A Timeless Fountain

From www.limpkin.fr 4 years ago in Blogs

This is one of these "just because" projects... The Idea I'm sure that most of you are familiar with the stroboscopic effect. To paraphrase wisegeek, it is a phenomenon of human visual perception in which motion is shown to be...

A Personal Perspective on Managing an Open HW Project – Part 2

From www.limpkin.fr 5 years ago in Blogs

$120k and a year after my previous article, you might be interested to know what happened behind the scenes... Let's pick things up where we left off I can't believe the Mooltipass project is already more than 15 months old......

A Personal Perspective on Managing an Open HW Project – Part 2

From www.limpkin.fr 5 years ago in Blogs

$120k and a year after my previous article, you might be interested to know what happened behind the scenes... Let's pick things up where we left off I can't believe the Mooltipass project is already more than 15 months old......

Trying to Make a Tiny NFC Reader with a TRF7970A

From www.limpkin.fr 5 years ago in Blogs

Want a free board? Read below! My regular readers may already know that I never stop working on a project half-way. This is unfortunately the only exception so far, motivated by the fact that an IC isn't doing what it's...

Trying to Make a Tiny NFC Reader with a TRF7970A

From www.limpkin.fr 5 years ago in Blogs

Want a free board? Read below! My regular readers may already know that I never stop working on a project half-way. This is unfortunately the only exception so far, motivated by the fact that an IC isn't doing what it's...

First Steps with the ESP8266-03 Development Board

From www.limpkin.fr 5 years ago in Blogs

A fun afternoon project with two platforms... As mentioned in my previous blog post I was very optimistic when designing my ESP8266-03 development board and didn't even prototype it before launching a batch in production. As I just received a...

First Steps with the ESP8266-03 Development Board

From www.limpkin.fr 5 years ago in Blogs

A fun afternoon project with two platforms... As mentioned in my previous blog post I was very optimistic when designing my ESP8266-03 development board and didn't even prototype it before launching a batch in production. As I just received a...

A Development Board for the ESP8266-03

From www.limpkin.fr 5 years ago in Blogs

A Wifi platform for $3... who wouldn't want to play with it? For the last few weeks we have been seeing a lot of awesome projects built around ESP8266 Wifi modules: These modules come in different shapes and colours and...

A Development Board for the ESP8266-03

From www.limpkin.fr 5 years ago in Blogs

A Wifi platform for $3... who wouldn't want to play with it? For the last few weeks we have been seeing a lot of awesome projects built around ESP8266 Wifi modules: These modules come in different shapes and colours and...

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