Erygion's projects

Erygion's projects A catalog of prototypes based around Arduino, ESP32, STM32 and RaspberryPi.

I'd like to start a company someday and would like to track progress, feedback or comments are very welcome.

10/18/2021

Did you know? An Arduino Uno (ATMEGA 328P) can be configured to act as a temperature sensor! It's not super great but it definitely works and I'm wondering ways I could use this in future projects. Did you know about this?

10/17/2021

It's a hand wound Tesla coil ⚡ or close to a Tesla coil, this circuit is called a Slayer Exciter circuit and this version is the simplest on the internet. It uses 9V and runs at 165mA with a load and 50mA without. Needed parts are a 2N2222 PNP BJT, 22k resistor and an LED, I also added a buffer capacitor but that's optional. My secondary coil is ~400 turns and the primary coil is 5 turns. It's parts are very cheap and it's fairly easy to make, it's a fun little circuit and I'm going to make a little desk lamp out of mine.

10/14/2021

The Keyestudio "PLUS" is a great dev board I've been wanting for a while. It's a Uno style board with a bunch of upgrades. The best part about it is you can switch the internal logic level from 5V to 3.3V! No more logic level converters (at least for prototyping). It also has USB type-C that uses a CP2102 USB to UART ASIC that's better than the ATMEGA 16U2 that the standard UNO uses and I could list all the reasons but to sum it up this ASIC (CP2102) was made specifically for this purpose. The efficiency for the power jack is in the 90% range where the standard UNO is in 40% - 50% range, the PLUS used a switch mode power unit instead of linear one. It also has all the important pins broken out with GND and PWR pins for each. I got mine on Aliexpress for under $12 shipping and all.

06/29/2021

We got up to 111° F today, so I've been laying low and messing around with the LM386 audio power amplifier. I've never made any kind of audio amp so I was surprised how well it came out but it's all thanks to this website that has a LM386 schematic called Ruby v1.2 (I'll be happy to share the link) it's not what the datasheet says to do but it works much better and the site shows ways to improve further for specific applications. I'm having fun with this and will definitely be using this in future projects. I got 10 LM386N-1 ICs for $2 so I'm wondering what else is out there for audio amps... if anyone has a beloved audio chip let me know, I'd like to try it.

06/17/2021

The AT89S51/52 (8051 series) is a older microcontroller that predates the Arduino Uno. It has UART and SPI peripherials as well as interrupt pins but no internal EEPROM (external only), I2C or ADC. The programming is a bit different. You can use a C or Assembly program to turn your code into a hex file that you load onto the chip's flash using a USB ARV parallel programmer. I've heard from a great EE teacher that it used to be a super complicated process and so at the time this was great, how far we've come. #8051 #2008

06/08/2021

A Pi Glow binary system clock that runs at boot. I've been learning Python and this little device has been helpful. It's controlled using I2C and is very flexible. The Pimoroni company makes these and lots of other great colorful stuff too.

04/27/2021

What is negative differential resistance? "Learn Electronics" YouTube channel did a video on this and provided this circuit. I tried to run it in a simulator and it didn't work as I thought. I guess negative resistance is just a theory but then what's up with the circuit? I cannot figure out how this circuit works. If you know please let me know.

04/15/2021

I saw this 6E2 "magic eye" vacuum tube on Ali Express and I had to mess with it. This circuit is used as a audio visualizer but I want to figure it all out and use it for something else. These type of tube came around in 1961 and were commonly used in radios. The green phosphorus coating is illuminated by flowing electrons and has moving parts to direct the flow. This old tech is really cool and I'm definitely going to learn how to use it. The only thing I don't like is the 250 VDC it needs to run. #1961

04/09/2021

My two year update! This Joule Thief has been blinking on a single charge since 04/07/2019 and has blinked roughly 75,600,000 times! I made this device when I saw someone do a two year update with a device a lot like this and now I'm doing one of my own, yay! I'm excited to see how long it'll go.

04/05/2021

Raspberry Pi Pico running on Arduino IDE all running on a Raspberry Pi 3 B+. Andreas Spiess did a video on the Arduino IDE finally having support for the Pico and its super easy. If anyone wants a link to the 5 minute video let me know.

03/25/2021

I finally got the SPWM inverter to stable out. It's turning 25v DC into 110v AC (green lamp rated at 115v AC) and the sine wave doesn't look like total garbage 😛 I've been using the EGS002 SPWM driver board (previous post) and tried the updated EGS003 and it is definitely more stable. This is just proof of concept, I have a long way to go with this but I'm making progress. I need to use a high frequency transformer instead of a 60Hz one and I want to use two stages: a voltage boosting stage (12v DC to 200v DC) and a forming stage (200v DC to 115v AC) instead of this chip doing everything. Now that I have it stable I can move to the next step.

Address

Tacoma, WA

Website

Alerts

Be the first to know and let us send you an email when Erygion's projects posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to Erygion's projects:

Shortcuts

Share

Category