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So I have this Raspberry Pi cluster that is connected to a SONOFF S20 WiFi plug that has custom firmare on it. I can ping that plug using Linux and curl to power on/off my cluster. But I want to be able to power it on from GPRS without having to open up a VPN in my router and use WiFi. That is how I came up with the idea of using an Arduino R3 WiFi board (because it can take 5V) and a SIM800L module (also 5V caable). I've fashioned a custom enclosure for this project and it all fits in nicely. ...
cypresstwist

Neotrellis Synth

Posted by cypresstwist Mar 14, 2020
Acoustics Enter Your Electronics & Design Project for a chance to win an $200 Shopping cart of product! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   This is an Adafruit Neotrellis M4 synth board. It can run Arduino and Circuit Python. I run some audio samples with the following code on it:   import time import board import busio import audioio import adafruit_fancyled.adafruit_fancyled as fancy import adafruit_trellism4 import adafruit_adxl ...
Acoustics Enter Your Electronics & Design Project for a chance to win an $200 Shopping cart of product! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   I'm making a children's toy with 10-11 analog buttons. Each time you push a button a sound comes out. The files are 16hz stereo OGGs. I'm using an Adafruit Audio FX with 16MB and built-in amplifier. Two 8ohm/1W speakers, 5V power source. The plan is to atach a TFT screen and make the screen display ...
Holiday Special 19 Enter Your Holiday Season Project for a Chance to Win Over $20,000 Worth of Prizes and Gifts to Give! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   As a Psychologist I'm always searching for new and unconventional ways to treat my clients and patients. Kids are the most difficult. The younger they are, the more shy and introverted they tend to be during therapy sessions. With an adult I can apply a clinical standardized test like S ...
This is a rewrite of an article I did for ”Linux Magazine”. Do you know those cheap Chinese smart plugs that you can turn on and off with the help of your smartphone? You can install Linux on them. Here's how.   The ITEAD SONOFF S20 is a fairly cheap smart plug that you connect to a wall plug and then stick some device in it and you can turn on and off said device via a smartphone app for iOS or Android. But if you want to do the same (and more) from your computer you can insta ...
So I have this 13" Sony DPT-RP1 e-Reader that I use for reading studies and books. Some books I can't find online for free or are out of stock and I have to sometimes resort to The Internet Archive to borrow scanned copies of them in PDF format. The problem is the scans are not optimized for e-Ink screens: yellow-ish pages that appear gray-dark on the monochrome screen, text imprints from the opposite page still visible through the paper. I needed clean images to be able to read a book under nor ...
I really like the NVidia Jetson Nano. 128 CUDA cores is a lot of power for an $89 small form factor computer. Especially given what you can do with it. I've bought mine for $99 from SeeedStudio (and without advertising for them - I see the price droppeed to $89 these days). It doesn't have WiFi or an active cooler so I've also bought a b/g
WiFi module plus two antennas from AliExpress and used a 5V cooler for the huge heatsink. Got myself a metal case and started experimenting.   There ...
So I saw a video of Open LED Race in action and I liked it. Simple, enjoyable, cheap to make and something that would keep small kids entertained. I'm a Psychologist and some of my clients are less than 10 years old so in an effort to bond with them in the first meeting I needed something that would create the feeling of a mutual goal, engage them in conversation and allow me to study their determination and level of engagement in the game. Open LED Race is perfect for this.   How Open LED ...
A friend of mine is a Harry Potter fan. So when her birthday approached I've decided I'll gift her something special. I took a Raspberry Pi 3 B+, a Skywriter HAT for gesture control, an old 17” LCD monitor and some cables and set to work. There's a Linux software called "MagicMirror 2" that does all of the work so I only had to deal with the hardware for now. The screen had an 1280x1024px resolution and it came from my father's old office PC that he discarded when he retired. Since it was ...