🔊 ESPLink

Providing optical audio link from an ESP32-S3.

⚙️ Hardware

📌 Pinout

• Optical Audio Output IO21
• Status-LED IO11
• Ethernet
  • MISO IO7
  • MOSI IO16
  • CLK IO17
  • CS IO18
  • INT IO8
  • RST IO15
• Aux GPIO
  • TXD0 IO43
  • RXD0 IO44
  • General Purpose IO2, IO41, IO42
  • External IO13

🔩 BOM

Value	Footprint	Qty / Reference Ethernet	Qty / Reference Wireless
22R	0603	12 (R2,R3,R5,R7,R8,R9,R10,R11,R12,R13,R14,R15)	5 (R2,R3,R4,R5,R6)
5k1	0603	2 (R18,R19)	2 (R9,R10)
10k	0603	5 (R1,R6,R16,R17,R20)	4 (R1,R7,R8,R11)
25k5	0603	1 (R4)	-
10n (50V)	0603	1 (C5)	-
100n (50V)	0603	4 (C2,C6,C10,C12)	3 (C2,C7,C8)
1u (16V)	0603	2 (C3,C8)	2 (C3,C6)
10u (16V)	0805	1 (C7)	1 (C4)
22u (16V)	1206	4 (C1,C4,C9,C11)	2 (C1,C5)
PTSLR06038V050	0603	1 (F1)	1 (F1)
USBLC6-2SC6	SOT-23-6	1 (D1)	1 (D1)
SK6812SIDE	SK6812SIDE	1 (D2)	1 (D2)
ESP32-S3-WROOM-1U-N16R8	ESP32-S3-WROOM-1	1 (U1)	1 (U1)
TPSM861253RDX	QFN-FCMOD-7-3.3x4mm-P0.5mm	1 (U2)	-
AMS1117-3.3	SOT-223-3	-	1 (U2)
GCT USB4105-GF-A	GCT_USB4105-xx-A	1 (J4)	1 (J4)
DLT1150	DLT1150	1 (J3)	1 (J3)
USR-ES1	USR-ES1	1 (U3)	-

💡 Credits

The idea sparked from the Sonocotta devices, support for optical output is brought by johnboiles, the hardware implementation is based on the idea from Rudd-O.