Posts with «general» label

Get HID Report Descriptors with “win-hid-dump” & “mac-hid-dump”

I help support the USB HID projects hidapi and node-hid. One of the aspects of HID that isn’t clear is that HID devices transmit and receive data with “reports”, fixed-size data packets, and that reports a device respond to is described by the HID Report Descriptor it hands to the OS. The OS then only [...]
Todbot 29 Jan 07:28
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DIY Neopixel / WS2812 Development Kit

If you are like me, you play around with Neopixel / WS2812-style LEDs a lot. Normally I solder my own custom-connectors and don’t use the ones that come with the reels I buy. But since we’ve been playing around with WS2812-compatible Xmas lights, I decided to make a “Neopixel Dev Kit” for easier experimenting with [...]
Todbot 08 Jan 21:09

WS2812-compatible “fairy light” LEDs that know their address

I’ve not done much on our plotter Xmas tree this week because, well… if you follow me on Twitter, it’s likely you’ve seen me ramble on about these crazy new Christmas Tree lights we got for our tree (first tree ever!). They appeared to maybe be WS2812 / Neopixel compatible and yup, they were! But [...]
Todbot 01 Jan 21:49

Precise flood fill with AxiDraw

We recently got some inexpensive multicolored 0.3mm technical markers (AmzAffil) for use on the AxiDraw and they are pretty good! For this week’s batch of days for our 31-box AxiDraw calendar, I wanted to play with doing “flood fill” / solid color fills. Normally the “hatch fill” extension part of the AxiDraw Inkscape extensions creates [...]
Todbot 18 Dec 23:05
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Playing with AxiDraw for the Holidays

For the month of December, Carlyn and I are making a vaguely tree-shaped “calendar” with 31 boxes, 30mm x 30mm each. This is a design exercise to get us more familiar with the very fun EMSL AxiDraw, an easy-to-use pen plotter. We each get half of the days, randomly, and each of those days’ boxes [...]
Todbot 11 Dec 21:59
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MagTag Day of Week

I’ve been very excited by CircuitPython’s move into the ESP32-S2 space. The ESP32-S2 is a WiFi-enabled microcontroller with built-in USB and a crypto engine so it can do HTTPS properly. And in Python! CircuitPython is much more pleasant than Arduino for network-based tasks, where there’s lots of string processing. So for this week’s Deep Fried [...]
Todbot 20 Nov 20:26
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Converting Pixel Art for Matrix Portal

I tried my hand at pixel art and discovered I cannot do it. But I wanted to honor Justin in a pixel arty way, so I instead tried my hand at converting some of his pixel art for display on a 32×64 RGB LED matrix driven by a Matrix Portal driving. This wasn’t so easy. [...]
Todbot 30 Oct 21:15
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Spoooky CircuitPython Circuits!

After using Python for a decade, I’ve decided to finally get better at it. I think diving into CircuitPython will be a nice scaled-down universe to learn to write concise “Pythonic” code. For hardware I’m using Adafruit’s new QT Py board and CircuitPython’s new ESP32-S2 support. And for a theme this month I want to [...]
Todbot 09 Oct 19:28

Prevent annoying Mac ._ files on CIRCUITPY

Example: Unzip & Download files to CIRCUITPY The entire process in a single session, using a neopixel example: Background On the Mac, the OS stores a bunch of different meta information about files inside those files. These are called “Extended Attributes” or “xattrs”. If you copy a file on a Mac to a thumbdrive or [...]
Todbot 04 Oct 06:48
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Touring Machine First PCBs!

Last week I submitted PCBs to be fabbed and got them back this week. They look pretty good! I’ve not soldered anything down yet but the footprints are all good except for the rotary encoder mounting holes. The Eagle part I used has them at 2.05mm but they need to be 2.4mm. I need to [...]
Todbot 18 Sep 19:57
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