Couple minutes ago I finally get the USB HID work ! By changing the USB device name from "Wacom Rip off" to "Wac0m Rip off". I still had no idea why this change make the cursor actually move (as I said earlier that the "evtest" did shows event report)....
New controller is now in place after refactoring the Motori code and adding some HPGL commands including escape sequences for querying the input buffer size and free space. The escape sequences can be used by the app sending data to avoid overflowing...
A smart pen without a wide range of app support is only as good as a dumb one (maybe worse). Having my own drawing app as a companion would the best scenario to launch the product, because users will enjoy the full potential of the stylus out of the...
The project heavily depended on Ben's original article and 3D printed parts including the motor holders and the pen gondola. It was never completely clear how the electronics were attached to the board in the original design. I've now merged some other...
Programming up a notification CNC routed LED board for a 16 Raspberry Pi cluster project:Doodling around with a 3D pen:Tufting a charity quilt:This robot project will eventually be able to be programmed in various languages, eg: Logo, Picaxe, Python,...
I have reorganized the code and pushed everything to Github.There are only three source files:rpi-lightpen.c - Linux kernel driver that will timestamp IRQs from VSYNC and the light pen sensor. From the time offset between those two events it calculates...
Printze was a months-long project... Where're all my logs?Off the tlp of my head:Goopy-vias from blown caps was an early thing, fixed...Blown transistors, replaced...Once functioning, a little alcohol revived 20+year-old ink heads.Injected ink from a...
I wanted to compare different motor drivers together to see if we could maximize the torque of our motors. Here is a picture of my test rig and the results. The A4988 driver is a good starter driver. Even at peak current it did not run too hot. It peaks...
The M10 is a FPGA board with a soft core MCU running at 96MHz. It also features a rich set of onboard peripherals like voice CODEC, (including microphone and speaker jack), microSD socket, SRAM, onchip A/D converter, Temperature sensor diode and...
Revision 1 In first instance, we'll try to compare the performance with the #TritiLED. In order to do that, we'll assemble the following variant: Placing R8 instead of the TPL5110 circuit so that the LED doesn't flash. This will make it easier...
The idea for the project came when I was considering using power over ethernet (POE) for another project and wanted to understand how to implement it in something simpler beforehand. At around the same time I came across the affordable stack light units...
Seems that I am going overbudget. The initial goal was for doing this "undrer 300 EUR" but the material costs before laser cutting will be pushing me up to 325. With the laser fees added I'm hoping to fit within ~350 EUR for the machine with the pen,...
The idea of a super affordable smart pen was born when I was playing with the earphone volume slider while listening to music. I realized my force was applying to the volume slider and music was changing accordingly. This force (pressure) could be measured...
My goal is to make a computer you can extend with some peripherals devices. Of course, the modern ones, no vintage cassette tape or light pen. But there is a problem: a lot of them has a SPI or I2C interface.Of course you can simulate SPI and / or I2C...
I'm happy with the output right now. I thought the right-hand motor was slipping / behaving inconsistently, but I've re-done the GPIO connections and I think one of those may have been loose previously. One thing I don't yet have fully worked out...