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caspar

I have fun building things and learning

Germany

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This user joined on 08/02/2025.

My Projects

Using NFC RF energy harvested from a phone tap to submit commands and start a microcontroller. No standby power.

Harvesting NFC Energy to Transmit Commands

compact, energy-efficient, battery-powered system for ePaper-based display of information gathered via Wi-Fi

inki - low power wireless epaper device

Web clockgenerator: Web control for a Si5351A via a Pico W.

Simple clock generator with webinterface

Projects I Like & Follow

The project describes the construction and operation of flip-disc displays. It also shows a simple way to control them via Arduino.

Flip-disc Display - How it Works & How it is Built

marcin-saj Marcin Saj

A couple parted out Kaypro keyboards and a tired old Apple IIc monitor become a resto-mod late 70s looking AVR development workstation

Atari AVR Development Workstation

john-anderson John Anderson

A clock based on 7-segment flip disc displays

Flip-disc clock

david-plass David Plass

Create awesome e-paper dashboards within minutes! Modularity? Check! Python3? Check? Works on Raspberry Pi Zero W? Check!

Inkycal - Your own E-Paper Dashboard

Featuring a ZnSe beam splitter and a pyroelectric detector, the FTIR spectrometer ensures precise molecular analysis with reliability

JASPER : FTIR

tony-francis Tony Francis

Reading temperature accurately while siphoning power from the NFC field in a keychain compatible form factor

NFC_temp - passive NFC thermometer

There’s a big unused window in my workshop and have wanted to try hydroponic culture for a long time. So here’s my attempt!

Hydroponic garden for the workshop

Work in progress FMCW ground penetrating radar. Sharing measurements, build logs, and asking for feedback on sensitivity and antenna design

DIY 800..1600 MHZ FMCW GPR – in progress...

Geiger counter posing as an IoT device

IoT Geiger Counter with RN4870 BLE Module

florian-wilhelm-dirnberger Florian Wilhelm Dirnberger

A locomotive for Ikea/ Brio wooden track. ESP32 + steering + speed control + self decupling

Locomotive for wooden tracks

In this project, we will build a tiny internet clock connected to your wifi to get time from NTP servers.

Tiny Internet Clock

A desk clock using high-quality bitmap images of the nixie numbers with Wifi network-based time updates and a web-based controls.

Faux Nixie Clock

dan-julio Dan Julio

A clock that uses a tuning fork as a time reference, but calibrated!

A more precise Tuning Fork Clock

Retrofit an old clock. Sync to internet time with Network Time Protocol (NTP)

Upcycling Old Clock with NTP

Data transmission using an LED as a photodiode

Better Than Bluetooth

a mechanical flip display the size of a 1/2" LED 7-segment display

The Tiny Flip Display

A compact digitally controlled RF 1.8 to 28 MHz platform for HF amateur. DSP mod/demod and integrated FT8 QSO management.

ESP32 HF QRP FT8 Transceiver

guido-iw5alz Guido - IW5ALZ

Get 1 Hz blink LED from the radio signal

1 Hz Challenge on Sunday morning

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