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A drumpad made using copper touch panels

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Serenity

Serenity is a drumpad or macropad designed with musicians in mind.
Instead of using traditional switches or buttons, it uses a copper layer on the PCB to detect touch input.

Powered by an ESP32-S3 devkit, Serenity can store sound files on a microSD card and output audio through a headphone jack.

It features 2 configurable buttons that let you switch between sound "layers" — allowing you to play many more sounds than just 8.
For example, with 4 layers, you can trigger 32 unique sounds.

I built Serenity after being inspired by those expensive drumpads used for triggering sound effects.
They often cost a fortune, so I created Serenity to cost under $50 USD, without sacrificing creativity or functionality.

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PCB

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3D Model

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BOM

Designator Footprint Quantity Value LCSC Part # Purchase Method Est. Price (USD)
C1 1812 1 100nf https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT_TDK_C342613.html PCBA $0.34
J1 microSD_HC_Molex_47219-2001 1 Micro_SD_Card https://lcsc.com/product-detail/SD-Card-Memory-Card-Connector_MOLEX-472192001_C164170.html PCBA $0.48
J2 HRO_PJ-320D-A 1 PJ-320D-A https://lcsc.com/product-detail/_Korean-Hroparts-Elec-PJ-320D-4A_C95562.html PCBA $1.50*
SW1, SW2 SW_PUSH-12mm_Wuerth-430476085716 2 SW_Push https://www.adafruit.com/product/1119?srsltid=AfmBOoqwRE8KhgtdWcEbSr0UxHVauoeQpAy56lpgwJ67pl_6lD0DS_sJ Ordering Online $2.50*
U1 ESP32-S2-DevKitC-1 1 ESP32-S3-DevKitC https://www.aliexpress.com/item/1005006446406795.html?src=google&pdp_npi=4%40dis!AUD!26.47!8.19!!!!!%40!12000037200113934!ppc!!!&snpsid=1&snps=y&src=google&albch=shopping&acnt=708-803-3821&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&gclsrc=aw.ds&&albagn=888888&&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=en1005006446406795&ds_e_product_merchant_id=5551326180&ds_e_product_country=AU&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=19366639602&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gad_campaignid=17338734196&gbraid=0AAAAAD6I-hFKAadTE4Avff5KRQWZAVIR1&gclid=Cj0KCQjwmqPDBhCAARIsADorxIYCUFoJhmIURqGGyT1Bnp1HNg7o4UZPdnUgz-yrKNdseuVaICe9NbkaAqTaEALw_wcBamp;gbraid=0AAAAAD6I-hFKAadTE4Avff5KRQWZAVIR1&gclid=Cj0KCQjwmqPDBhCAARIsADorxIYCUFoJhmIURqGGyT1Bnp1HNg7o4UZPdnUgz-yrKNdseuVaICe9NbkaAqTaEALw_wcB Ordering Online $10.00
U2 TQFN-16-1EP_3x3mm_P0.5mm_EP1.23x1.23mm 1 MAX98357A https://lcsc.com/product-detail/Audio-Amplifiers_Analog-Devices-Inc-Maxim-Integrated-MAX98357AETE-T_C910544.html?s_z=n_MAX98357AETE%2BT PCBA $3.50*

Total Estimated Cost

Subtotal: ~$50 USD without shipping

  • Prices dont include shipping, taxes, and PCBA assembly fees
  • PCBA components might have additional assembly costs

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A drumpad made using copper touch panels

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