Category: Electronics
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Cal Spa auxiliary pumps fix with Arduino
The auxiliary pumps on my old California Spa (from 2005) stopped working one after the other over a few (winter) months. I decided to dismantle the control panels that are in the spa. They both seemed water logged and the touch surfaces were all cracked. Dismantling the control boards is a mess! they are filled…
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IoT REBOOT – Apple HomeKit (Siri), Raspberry Pi, node-red, Homebridge
Simplifying the IoT setup The goal of this project is to install a Internet of Things (IoT) server that can control “things” AND, more importantly, communicate with Apple’s Siri and HomeKit. Initially, we will install a server on a Raspberry Pi. This server uses node.js extensively, but instead of doing all the programming ourselves, we…
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Apple HomeKit on iOS with Arduino (ESP8266) through Raspberry Pi – Part 2
Apple HomeKit on iOS with Arduino (ESP8266) through Raspberry Pi Note: This post, and the previous one (part 1), are obsolete. They have been replaced by this one, offering a simpler method to get started. They are left here for reference. Part 1 of this article explained how to install a HomeKit server on a…
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Apple HomeKit on iOS with Arduino (ESP8266) through Raspberry Pi – Part 1
The Internet of Thinks (IoT), using and iPhone, Siri, HomeBridge, MQTT and an Arduino – Part 1 Note: This post, and the next one (part 2), are obsolete. They have been replaced by this one, offering a simpler method to get started. They are left here for reference. The global project is shown in this…
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VC-1: Volume control for guitar using Arduino
As explained here, here and here, the VC-1 is a volume control for guitar (or bass) that can use a potentiometer, a variable analog signal or a Midi command to change the output volume.
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MIDI Experiments: Arduino as master
Arduino as a Midi master The previous two posts explained how standard MIDI can supply some current at 5 Volts if implemented according to the MIDI standards. In this post, I go a little further and explain how an Arduino, set up as a MIDI device, can power a second Arduino using a standard MIDI…
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MIDI experiments: Stealing power for an Arduino
In the previous post, I explained a simple circuit that will indicate if a MIDI OUT port can provide 5 Volts and a little bit of current between pin 2 (ground) and pin 4 (+5 Volts). Not all MIDI devices are wired that way. Some leave pin 2 disconnected (bad) while others connect it to chassis…
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MIDI experiments: A simple MIDI tester
While doing some research to build a simple MIDI tester, I started to study the “real world” MIDI electrical specifications out there. I also experimented with various MIDI equipment and measured some voltages. A simple MIDI tester MIDI specifications imply that a MIDI OUT circuit always provides +5 Volts, on pin 4, in reference to circuit ground,…
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About MIDI connections: Identifying the Midi pin numbers
A short article to help identify MIDI pin numbers in all those circuit drawings and photos on the internet.
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My ultimate versatile MIDI connection board: Versatility is the key
My Ultimate Versatile Midi Connection Board I work with Midi, a lot. I often have to plug equipment for testing instruments, circuits and interfaces. I often need to connect more than one device to a computer or micro-controller. So I decided to build the ultimate versatile MIDI connection board that I could modify, tweak, and install…