Karmanyaah's Musical Keyboard (#279)

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projects/karmanyaahs-musical-keyboard/README.md

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+---
+name: "Karmanyaah Malhotra"
+slack_handle: "@Karmanyaah"
+github_handle: "@karmanyaahm"
+tutorial: # none
+---
+
+# Touch Keyboard v1 🎹
+
+![render of the board](https://cloud-6gdaamip9-hack-club-bot.vercel.app/0image.png)
+
+<!-- Describe your board in 2-3 sentences. What are you making? What will it do? -->
+I wanted to learn to play music for winter break, so here's my musical keyboard!
+It will use a 555 timer IC - an IC that can oscillate at arbritary frequencies based on resistor/capacitor combinations.
+I used capacitive touch sensors because they're cool and I wanted to experiment with them :)
+
+<!-- How much is it going to cost? -->
+## Cost
+It cost $60.66, I used slightly faster shipping to be able to iterate faster. I'm working on making it cheaper in v2.
+
+<!-- Tell us a little bit about your design process. What were some challenges? What helped? ***Totally optional*** -->
+## Design Process
+The different pad colors in the render are me experimenting with whether soldermask makes a difference for the capacitive sensing.
+The main challenge was figuring out how to change the frequency of the 555 timer IC. 
+Most conventional tutorials on the internet use normal buttons, and make a resistor chain out of R2 (the lower resistor on a 555 timer in astable configuration). 
+I couldn't do that with my touch sensor IC because current flows two ways through the bottom resistor, and my touch sensor IC controlled a MOSFET, which can only control current in one direction.
+So, I had to mess around with R1 (again, see conventional astable 555 lingo). 
+But, messing with R1 varied my duty cycle a lot so the tone sounds kinda weird, but the frequency change should still work (Future me: it did work, sounds kinda weird though).
+
+## End Result
+
+My board arrived on Dec 6! One day before a final exam. So what did I do? I tuned it and learned to play of course :P
+
+![picture of the actual board](https://cloud-ikvjqbt2i-hack-club-bot.vercel.app/0rect899.png)
+
+[@gjkeller](https://github.com/gjkeller) reflecting on our shared final exam predicament by playing Welcome to the Black Parade: [![video](https://cloud-r0tvjamxw-hack-club-bot.vercel.app/0pxl_20231207_070916248.ts_2.mp4)](https://cloud-r0tvjamxw-hack-club-bot.vercel.app/0pxl_20231207_070916248.ts_2.mp4)
+And the month with Jingle Bells: [![video](https://cloud-6mqalxy6w-hack-club-bot.vercel.app/0pxl_20231207_071113477.ts.mp4)](https://cloud-6mqalxy6w-hack-club-bot.vercel.app/0pxl_20231207_071113477.ts.mp4)
+
+I'm working on V2 right now and hope to make it significantly cheaper to manufacture.