If you used transistors to control the solenoids, you can vary the amount of current they receive. With the relays, you can vary the amount of time they are closed (I used 8ms in this project, so a smaller time would be a less intense hit). The problem with this is that even subtle differences between solenoids (their internal friction, distance from the surface, etc.) means that some might not reach the keys at all while others do. In this project I had modes that did both (transistors and varied time), but also had a felt covered damping bar that could be pressed into the keys with varying pressure using servos. www.devinejohnny.com/projectgallery/midi-arduino-glockenspiel-with-tip120-transistors

Yeah, I used TIP120 transistors in this project. www.devinejohnny.com/projectgallery/midi-arduino-glockenspiel-with-tip120-transistors

@@MisterDevine it is very very cool! You are doing really good and it is inspiring.

Yes, but I don't know for sure how you might trigger the solenoids directly from a DAW. I think the software I mentioned in my blog post (in description) is depreciated. For my newer projects I use Hiduino, which lets you re-flash the firmware of an Arduino board so it is natively recognized as a MIDI device when you plug it into a computer.

It seems that the AP Physics curriculum has been a work in progress for many years now. You can access the curricula from Sprocket (for free), which is the Lucas Ed portal for all the resources they've produced. Looking at this page (sprocket.educurious.org/home/curriculum), you can still see that the physics curriculum is "coming soon!" I made the video above because I was involved in some of the early piloting.

@@MisterDevine thank you for the feedback!

Thanks! You should still give it a go, though. I would recommend some changes if you give it a try. I think the software mentioned in this video is no longer supported, but there is something called Hiduino, which is really cool. With a second Arduino acting as an ISP device, you can re-flash the firmware for the USB chip on your Arduino so that is acts as a native MIDI device. That means once you plug in the instrument to your computer, boom, it just shows up in your DAW and is ready to play. I've done that with some more recent instruments, but don't have a full write up on my website yet: www.devinejohnny.com/projectdetails/m7jy1wa0aukmz9ory546gcr8xu0wa5

I added a "Parts Files" section to my write up on my website so you can snag those. I added the 3D parts as .OBJ files and the instrument/base outline as a .DXF

Yes! You can message me on Instagram @johnny_devine_creations

@@MisterDevine Thanks I did.

Yes, I imagine so. It just needs something sending MIDI signals. I really need to do another video and write up on my website, but all my instruments after the ones in this video use hiduino, which re-flashes the USB chip on the Arduino so that when you plug it into something it is recognized natively as a MIDI device. That means you could plug a keyboard straight into the instrument and play it. No need for a DAW, hairless MIDI, loopMIDI, or any of that jazz. It's pretty cool.

@@MisterDevine Looking forward to learn how did you achieved all that! Really neat job!

Thanks! I took that approach with a later, better build: www.devinejohnny.com/projectgallery/midi-arduino-glockenspiel-with-tip120-transistors I also flash hiduino firmware to the Arduino in that build, which eliminated all that extra in between software; just plug in the USB and I pops up as a midi instrument. I also did a build with ULN2004 transistor arrays, which really slimmed down the electronics. Didn’t document it, but here’s some more about those chips: en.m.wikipedia.org/wiki/ULN2003A

I think this link will take you to what I bought on Amazon. They are relay modules made by ELEGOO, but there are numerous similar brands that would work as well. ELEGOO 8 Channel DC 5V Relay Module with Optocoupler Compatible with Arduino UNO R3 MEGA 1280 DSP ARM PIC AVR STM32 Raspberry Pi www.amazon.com/dp/B01HCFJC0Y/ref=cm_sw_r_cp_api_glt_fabc_C8G96KYR6HAHVXHRN5SY?_encoding=UTF8&psc=1

Also, if you didn’t see it already, I’ve got more details on my blog: www.devinejohnny.com/projectdetails/midi-xylophone-with-arduino-mega

thanks, i love u guy.

Thanks, always happy to help!

Of the two, the relay is much louder. I’ve put foam over the relay board before in other projects and that seemed to help. You could also increase the distance of the instrument from the relay, or put it in an enclosed box that doesn’t resonate. Working on a similar project?

@@MisterDevine thanks a lot. I thought using MOSFETs might be workable, but I'm just getting into it. I've got a couple of instruments I'd like to automate, but I'm just at the stage where I'm learning about different devices so I can choose what suits me. Thanks again.

Most parts by themselves (code, hardware, etc.) were pretty straight forward, and as long as I focused on one part at a time, it made the total project more manageable. The trickiest part for me was actually with the laptop that plays the midi music files and getting it to talk to the Arduino in real time. I have more details about the whole project in this video: kzbin.info/www/bejne/rH3ZiHeZqrqHbrc

@@MisterDevine I think this is the wrong link. It was not about music.

@@tutororialwiz Ha ha, oops. Thanks for the catch. I wonder how many people were like "whaaat???" Anyway, it should be the right link now.

I haven’t given a try, but I wondered the same thing. Those stepper motors are so noisy! It really vibrates the whole frame, which transferred into the body. I think maybe some more strategic padding could help too.

I agree. There are pickups for guitar sound holes (or just placing the mic inside the sound hole may help). Quite a bit of dedication to the project, good job. If you get even more ambitious you could strum the chords with a similar mechanism as the pick. Hope to hear it without the stepper motor noise.

Not a how to video, but I have some written explanations, code, schematics, and links to other videos I used. herring-clarinet-6z8c.squarespace.com/projectdetails/nintendo-zapper-gestural-mouse

Here's a link to an OBJ file: drive.google.com/file/d/12gwYgVF03RM6FXDwvpDPlw4yuGbG_UVL/view?usp=sharing I also put it on my project page: www.devinejohnny.com/projectdetails/midi-xylophone-with-arduino-mega If a different file type would be better for you, let me know.

Everything I learned, I learned from the internet. I've always found the learning resources from SparkFun and Adafruit to be helpful: learn.adafruit.com/ learn.sparkfun.com/ Getting a starter kit with an Arduino and some sensors is a good idea too. There was also a commercial makerspace in my city that gave me the chance to try out tools like 3D printers and laser cutters before making the big investment to get my own, which really opened up a world of possibilities.

I' m not bmvery good in arduino codeing so could you please help me dude?

@@dilshankasthuriarachchi4737 Happy to help, if I can. You can contact me through my website: devinejohnny.com

create.arduino.cc/editor/devinejohnny/dce6223a-1622-4c4d-a787-c55a66a617c0/preview

There is a tab that includes the schematic (dual_tmp36.png)

@@MisterDevine where does the place i checked in the description is it in the description please?

@@dilshankasthuriarachchi4737 I'm not sure exactly what you might see on your screen when you look at the online Arduino code editor I sent you. If you are asking where the schematic is, there should be three different tabs right above the main code (one for the code, one for a ReadMe file, and one for the schematic as a .png). Here is the code, if you weren't able to see that:

/*Dual TMP36 sensor code with output to serial monitor. Modified from code for the TPM36 temp sensor from Adafruit.com Devine 2020 */ //Define analog input pins for TMP36 sensors: int sensorOnePin = A0; int sensorTwoPin = A1; //Define various variables: int readingOne; int readingTwo: float voltageOne; float voltageTwo; float tempCOne; float tempCTwo; float tempFOne; float tempFTwo; //Define number of milliseconds betweeen each sensor reading: int delayTime = 1000; void setup() { //Begin serial communication to computer Serial.begin(9600); } void loop() { // Take raw reading of both sensors: int readingOne = analogRead(sensorOnePin); int readingOne = analogRead(sensorOnePin); // Convert that readings to voltages; for 3.3v arduino use 3.3 float voltageOne = readingOne * 5.0; voltageOne /= 1024.0; float voltageTwo = readingTwo * 5.0; voltageTwo /= 1024.0; // Convert to degrees Celsius: float tempeCOne = (voltageOne - 0.5) * 100; float tempCTwo = (voltageTwo - 0.5) * 100; // Convert to degrees Fahrenheit: float tempFOne = (tempCOne * 9.0 / 5.0) + 32.0; float tempFTwo = (tempCTwo * 9.0 / 5.0) + 32.0; // Print out sensor one and two, seperated by a comma, in degrees Celsius: //(units not printed so data from serial monitor can be more easily graphed in something like Excel) Serial.print(tempCOnce); Serial.print(" "); Serial.println(tempCTwo); //Wait before taking another reading: delay(delayTime); }