Old PSTN entry phone - door opening - #4

In this article I'm  describing the final version of hardware and firmware for the door opening.

Previous articles :

• https://hanixdiy.blogspot.com/2020/05/old-pstn-entry-phone-door-opening-1.html
• https://hanixdiy.blogspot.com/2020/05/old-pstn-entry-phone-door-opening-2.html
• https://hanixdiy.blogspot.com/2020/05/old-pstn-entry-phone-door-opening-3.html

MMCedu project - keyboard #1

This article is part of the MMCedu project (Magnetic Memory Core Education) and discusses about a keyboard to interact with the Magnetic Memory Core project.

Digital Encoder breakout

On many projects I use a digital encoder as input device (to set values, select, etc.).
In order to have more flexibility to put the encoder on panels, I usually manually wire it on a prototype board, every single time.

So it is time to have a standard way to deal with this.

EasyEDA

EasyEDA is a schematic CAD with PCB capabilities, like Eagle CAD, but running in the browser (I'm using Chrome).
For a project I started  I'm trying to use it for schematic and eventually for the PCB.
This is a brief review of my experience so far.

tRPOf with Trinket - updated

This article is about a RPOf circuit for the Raspberry Pi using a Trinket, thus the name  tRPOf.
The main difference from previous ones, is that this project uses a standard Adafruit Trinket as microcontroller instead the MSP430 in order to use "off the shelf" components with less effort of programming and a LiPo charger/USB DC/DC converter..