2019
So far we've built the Etch-A-Snap and processed an image to produce a 1 bit image. In this part we’ll look at how to take this image and generate the draw instructions for the plotter.
Etch-A-Sketch is a very simple 2D plotter which is limited to drawing a single …
The image processing produces a 1 bit image (B&W) of 240x144 pixels. The next step is to take this image and convert it into movements for the motors.
The way this is done is governed largely by the design of the Etch-A-Sketch — any drawing must be made in one …
Etch-A-Sketch is a very simple 2D plotter which is limited to drawing a single unbroken line, of a single thickness and colour which is dark-ish on a silver-ish screen. To be able to plot a photo onto the Etch-A-Sketch we need to transform the image so that —
- the resolution makes …
| Requirements | |||
|---|---|---|---|
| Pocket Etch-A-Sketch Not the really really tiny one. | amazon | ||
| 3D PrinterI have & recommend the Anycubic i3 Mega. | amazon | ||
| PLARed, white & black | amazon | ||
| 2x 5V 28BYJ-485V stepper motor. | amazon | ||
| 2x ULN2003A IC Darlington array, as stepper driver chip. | amazon | ||
| 1x 330Ω resistor for LED driven off Pi … | |||
Etch-A-Snap is (probably) the worlds first Etch-A-Sketch Camera. Powered by a Raspberry Pi Zero (or Zero W) it snaps photos just like any other camera, but outputs them by drawing to an Pocket Etch-A-Sketch screen. Quite slowly.
Photos are processed down to 240x144 pixel 1-bit (black & white) line drawings using …
2018
Pulse sensors are a common feature of fitness monitors, used to track your activity and cardiac fitness over time. These external monitors use the reflection and absorption of bright green/infra-red light to detect the pulse wave travelling down the artery — a technique called photoplethysmography (PPG). This same techique is …
2017
KropBot is a little multiplayer robot you can control over the internet. Co-operate with random internet strangers to drive around in circles and into walls.
If it is online, you can drive the KropBot yourself!
The Scroll pHAT is a little 11x5 (55) white LED matrix pHAT which you can control easily from a Raspberry Pi. In this project we'll squeeze a tiny-yet-playable game of Tetris onto the Scroll pHAT.
| Requirements | |||
|---|---|---|---|
| Raspberry Pi Zero / Zero W You don't need wireless for this project, but it … | |||
Established 1980