Author Archives: Willem Aandewiel

Simple Challenge/Response sketch

Posted on 30 May 2021 by Willem Aandewiel

[ ]For a project I’m working on with Jelmer (JDJelectronics) we have to communicate with a SIMCOM GPRS modem. I wrote an interactive sketch that can handle the communication (with so called “AT” commands) with a GPRS modem. Parts of … Continue reading →

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Slimme Meter Poort Extender (P1 HUB)

Posted on 16 April 2021 by Willem Aandewiel

[ ] (Laatste update: 02-03-2025 – Versie 2.1) Bijna alle Nederlandse huishoudens zijn inmiddels uitgerust met een zgn. “Slimme meter”. Deze meter stelt de energie leveranciers in staat om op afstand de meterstanden op te vragen. Om ook de eindgebruiker … Continue reading →

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Posted in Arduino, DSMR-logger, ESP32, ESP8266, Hardware, KiCAD | Tagged , , , , , , , , | 76 Comments

digital Tape Recorder for the KIM-1 (and clones)

Posted on 20 February 2021 by Willem Aandewiel

[ ]In October 2017 I wrote a post with the title “Solid State Tape Device for the (micro)KIM“. Recently one of the makers (Dirk Dral) wanted to adapt the device for use with a genuine KIM-1 and ran into some … Continue reading →

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Posted in Arduino, Computer, ESP8266, Firmware, Hardware, KiCAD, KIM, Uncategorised, WiFi | Tagged , , , , | 32 Comments

A 32kb Memory Expansion Board for the microKIM

Posted on 19 February 2021 by Willem Aandewiel

[ ] As you may know, I own a microKIM (KIM-1 clone) Single Board Computer (SBC).  It is a trip down memory lane to work with the incredible simplicity of what was once “top of the bill” technology. The original … Continue reading →

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Posted in Arduino, Computer, ESP8266, Hardware, KIM | Tagged , , , , , , | 5 Comments

Extending GPIO pins on your Micro Processor

Posted on 10 August 2020 by Willem Aandewiel

[ ]Somehow, no matter what micro processor I choose, I end up with too few GPIO pins for the projects needs or for what I want to do. For a recent project I switched from the ESP8266 to the ESP32 … Continue reading →

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An ESP8266 Ticker

Posted on 9 June 2020 by Willem Aandewiel

[ ] INTRODUCTION From the moment I saw the MAX7219 Dot matrix modules I wanted to build a news ticker. I wanted the option to enter my own messages without having to install special Apps on my phone or tablet. … Continue reading →

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Posted in Arduino, ESP8266, Hardware, WiFi | Tagged , , , , , , , | 97 Comments

Controlling Lots of Relays with only 2 GPIO pins

Posted on 1 May 2020 by Willem Aandewiel

Piggyback board for 8- or 16-relays boards to control with I2C Continue reading →

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Posted in Arduino, Computer, ESP8266, Hardware, WiFi | Tagged , , , , , , | 1 Comment