Medium

James Wanderer

James Wanderer

·

Mar 24

Writing a Web App with HTMX

An annotated mini-HTMX application

Writing a Web App with HTMX

James Wanderer

·

Nov 23, 2025

Coding an Arduino to Talk to Credit Cards

Using RFID via a PN532 Device

Coding an Arduino to Talk to Credit Cards

James Wanderer

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Nov 14, 2025

Buying and Holding Bitcoin

Is it safe?

Buying and Holding Bitcoin

James Wanderer

·

Oct 10, 2025

A BER-TLV Library for Arduino

While working with a PN532 RFID reader to fetch data from a tap-to-pay credit card, I found that most of the communication with the credit…

A BER-TLV Library for Arduino

James Wanderer

·

Aug 12, 2025

A Brief Look at RFID/NFC Tech

I tap my phone to a screen to enter the metro station. I tap a card to open a locked door. What is the technology behind this? To get a…

A Brief Look at RFID/NFC Tech

James Wanderer

·

Jul 24, 2025

Fixed: AT&T Fiber, pfSense, and IPv6 Subnets

I previously wrote about trying to get multiple IPv6 subnets working with AT&T Fiber residential service and my pfSense firewall/router. I…

Fixed: AT&T Fiber, pfSense, and IPv6 Subnets

James Wanderer

·

Jul 22, 2025

Writing an Arduino Library for a UART Based LoRa Device

Recently I had the opportunity to work with the Reyax RYLR998 LoRa radio module, a low-power, long range, low bandwidth device. These…

Writing an Arduino Library for a UART Based LoRa Device

James Wanderer

·

Jul 5, 2025

Why are we Booting CDROM Images on USB Sticks?

Exploring ISO Images and Bootloaders

Why are we Booting CDROM Images on USB Sticks?

James Wanderer

·

Jun 20, 2025

Writing Games for the ESP32

The Arduino micro-controller development environment, libraries, and hardware components have made technology that was once difficult to…

Writing Games for the ESP32

James Wanderer

·

Jun 8, 2025

Using Multiple IPv6 Subnets with ATT Fiber and pfSense

A hack and a reasonable fix

Using Multiple IPv6 Subnets with ATT Fiber and pfSense

James Wanderer

James Wanderer

James Wanderer has worked as a software developer and engineering manager for over 25 years. Interests include data center networking, security, reliability.

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