Category: Informational

Connecting a serial port to the WEB via Node.js

Serial Port to WEB via Node.Js

A previous post (here) documented how to connect a Python script to a serial port on a microcontroller.  This post documents connecting a serial port to the WEB via Node.js (which is a JavaScript runtime). Using Node.js and a module for node called serialport, it is very easy to connect a PC to a serial …

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An STM32F103C8T6 based MIDI Controller for MIDI2LR (Updated)

In a previous post (here) ,  a project was introduced for those of you who use Adobe Lightroom. There is a way to use a MIDI hardware ‘box’ to control various Lightroom actions. I am told that once you use the hardware controls you will never want to go back to the software ones.  A …

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Multiple Rotary Encoders on an STM32F103C8T6

Rotary Encoder

Rotary encoders are useful for many things.  Here is what they look like (with and without the button): They have 5 connections (Power, Ground, Data, Clock and Switch). The button can be turned (continuously in any direction) and it can also be pushed down .         The switch connection monitors the button …

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Powering your electronics projects with an ATX power supply

Bench Power Supply

Working with different electronics projects,  and especially microcontrollers , requires different voltages (usually 3.3,  5 and 12 Volts).  It is very fitting that the power supply used in most desktop computers (an ATX power supply) can provide exactly these voltages. There are a number of  projects  (found via a Google search) that turn an  ATX …

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STM32F103C8T6 Pin Tester to check your soldering

How good are you at soldering?   Here is the STM32F103C8T6  microcontroller board that I use  and have to solder all of the pins. Sometimes when I solder pins to the  board, the connection looks OK and even tests OK with continuity on a multimeter.  However, the solder connections even though they pass those two …

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5 Way Navigation Button connected to an Arduino or STM32F103C8T6

A 5 way navigation button actually has 7 different navigational settings. It has a lot of functionality in a small package.  The ‘button’ on it can be moved/pushed in 4 directions ( labeled up, down, left, right)  or pressed down. There are also two other switched buttons labeled ‘Set’ and ‘Reset’ for a total of …

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PIR Sensor and Relay Switch to turn on a Light

PIR Sensor and Relay Switch to turn on a Light

Ever wonder how a motion detector is used to turn on a light? Take a look at this graphic (made with Fritzing). It shows the circuitry that uses an STM32F103C8T6 microcontroller to control a PIR sensor and relay switch to turn on a Light. Get the Fritzing source code for the above image HERE (in …

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An STM32F103C8T6 based MIDI Controller for MIDI2LR

MIDI2LR MIDI Controller

For those of you who use Adobe Lightroom,  there is a way to use a MIDI hardware ‘box’ to control various Lightroom actions. I am told that once you use the hardware controls you will never want to go back to the software ones. There is a Lightroom plugin called MIDI2LR which interfaces various MIDI …

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WebRTC Phone Calls via Asterisk

WebRTC Phone Calls via Asterisk

Are you ready for another off topic article on WebRTC?  This one is titled WebRTC Phone Calls via Asterisk. I have written about Asterisk before (HERE) and that article did have something to do with microcontrollers  😎  Asterisk is an open source full featured phone system (PBX). In my last post about WebRTC, I showed …

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WebRTC Screen/Video Sharing

WebRTC Screen/Video Sharing

As many readers of this site can tell, I am a bit off topic with this article. None the less, I think those same readers will find it useful. The topic is WebRTC Screen/Video Sharing and shows how to communicate with another person (peer to peer) via video and audio using a Web browser.  This …

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