Ultra-Low-Cost AI Voice Card Design
Dont need audio jack, just a small buzzer speaker enough to have a back and forth conversation with the ai, if an s3 is easier to route use that, use chips rather then rebuilt packages to make it look cooler I dont want to use full esp modules
Thought for 3 mins 39 sec
Your goal: ultra-low-cost, single-sided 2-layer AI voice business card using bare ESP32-C3/S3, clustered bottom-edge/corner, JLC BASIC parts only.
Plan:
- Parts: choose bare ESP32-C3 SoC or ESP32-S3 SoC (lowest-cost BASIC), add INMP441 C141104, NS8002 C23072, ME6211C33M5G C82942, 10uF 0603 C19702, 0.1uF 0603 C14663, Red LED 0603 C2286, 1k 0603 C21190, TH pads for 8ohm 0.5W speaker, and 6 programming pads (5V, GND, TX, RX, BOOT, RST). Replace ESP32-S3-WROOM-1-N4R2 and remove connectors.
- Schematic: 5V pads -> ME6211C33M5G -> 3V3 rail with decoupling; EN/BOOT pulls; UART to pads; I2S to INMP441; MCU sigma-delta/PWM -> RC -> AC-coupling -> NS8002 IN; speaker to TH pads; status LED on 3V3.
- PCB: set 85 x 54 mm, all SMD top, parts along bottom edge and one corner; printed 2.4 GHz PCB antenna at top edge with keep-out; short audio runs; isolate mic/amp from switching loops; 2-layer with GND pour.
- Outputs: routed PCB, BOM (LCSC), CPL, and JLC cost for 5–20 qty.
Click Start and I’ll execute this exactly. Let me know C3 vs S3 preference (I’ll pick the cheaper BASIC SoC if not specified).
Pick ESP32 variant
Check current schematic
Add mic + amp parts
PWM-to-amp interface
![[2-layer] JLCPCB Constraints thumbnail](https://img-cdn.flux.ai/eyJidWNrZXQiOiJncmF2aXRvbi1lbGVjdHJpYy1zeW1ib2xzIiwia2V5IjoiZG9jdW1lbnRfYXNzZXRzLzItbGF5ZXItdGh1bWItYzk4NzE0NGEtNTg0Ni00MzEyLTlkNDktNjBlZmM2N2FiMDk3LnBuZyIsImVkaXRzIjp7InJlc2l6ZSI6eyJ3aWR0aCI6MTM2LCJoZWlnaHQiOjEzNiwiZml0IjoiY29udGFpbiIsImJhY2tncm91bmQiOnsiciI6MCwiZyI6MCwiYiI6MCwiYWxwaGEiOjB9fX0sIm91dHB1dEZvcm1hdCI6IndlYnAifQ==)