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Lee Hart's "1802 Badge" Kit (Rev. B): Developed for the 2024 Vintage Computer Festival Midwest

In this video, I show the new kit from Lee Hart, a "namebadge" (or simply "Badge") based on the vintage 1802 microprocessor. Using a clever 'minimum parts count' circuit, and an equally clever program in firmware (in an EPROM), and NO RAM, it continuously scrolls a 32 character alphanumeric message on its 8-position "starburst" LED display. The message is stored inside the 1802 in its battery-backed internal register bank, and the set of three NiMH cells (the battery) can maintain it for a LONG time. Connecting a USB programming cable (not included) will recharge the battery. The message can be entered and edited using just the three pushbuttons on the Badge. Alternately, any of several inexpensive USB-5V serial adapters, e.g. Sparkfun's 5V FTDI cable (not included) may be used to connect the Badge to a personal computer, and then using any terminal emulator application, the message may be entered/edited using the computer's keyboard and video monitor. I show the building process of the kit, I demonstrate it operating, and I program messages using both of the two methods. I then give a detailed study of the circuit schematic and theory, and provide some insight into the Badge's firmware. Finally, I show my design and build of a 3D printed case/holder, as well as my "hack" to allow use of an external toggle switch which is easier to use when entering messages, and I show how I added a green Lexan filter to dramatically improve the clarity of the display. In the video, I show the URL to my 'fileshare' webpage, where the plans and STL files, and 'build instructions', for the Holder may be downloaded, as well as my chart of all available alphanumeric characters. Timeline table of contents: 00:00 Introduction 03:50 Included parts 08:49 Printed circuit board assembly 16:19 USB adapter 17:04 Initial test 18:27 Programming using the pushbuttons 22:02 Demonstration of programmed message 24:25 Beauty shot 24:43 Programming using a computer via USB 31:57 Schematic & circuit theory 1:23:50 Making a 3D printed Badge Holder 1:52:16 Adding a green filter to the display