Chungus is an ESP32-S3 development board created as a learning exercise in KiCad.
- ESP32-S3 - Dual-core 240Mhz processor with WiFi and Bluetooth
- Breadboard-friendly pinout/dimensions (26.5 mm wide, 22.86mm between pin headers)
- 19 GPIOs broken out to pins
- Onboard WS2812B RGB LED connected to GPIO48
- Onboard Reset and Boot (GPIO0) switches
- Optional Li-ion battery charger
Either ESP32-S3-WROOM-1 (PCB antenna) or ESP32-S3-WROOM-1U (IPEX antenna connector) are suitable for these boards.
The voltage regulator was chosen specifically for its low quiescent current. If you cannot source it, look for SOT23-5 LDO regulators with 3.3V output voltage and at least 500mA output current.
| Designator | Part | Notes |
|---|---|---|
| C1 | 0603 SMD 0.1uF | |
| C2/C3 | 0603 SMD 10uF | |
| C4 | 0603 SMD 1uF | |
| D1 | 0603 SMD LED | |
| J1 | Molex 47346-1001 | Micro-USB connector |
| J2/J3 | 2.54mm Pin Header | |
| R1 | 0603 SMD 330 Ohm | |
| R2 | 0603 SMD 10k Ohm | |
| S1/S2 | PTS526_SM15_SMTR2_LFS | Tactile switch |
| U1 | ESP32-S3-WROOM-1U | |
| U2 | RT9080-33GJ5 | Voltage regulator |
| U3 | WS2812B | RGB LED |
| Designator | Part | Notes |
|---|---|---|
| C1/C2/C6 | 0603 SMD 1uF | |
| C3 | 0603 SMD 0.1uF | |
| C4/C5 | 0603 SMD 10uF | |
| J1 | Molex 47346-1001 | Micro-USB connector |
| J2 | JST-PH-2 | LiPo connector |
| J3/J4 | 2.54mm Pin Header | |
| R1 | 0603 SMD 10k Ohm | |
| R2 | 0603 SMD 100k Ohm | |
| S1/S2 | PTS526_SM15_SMTR2_LFS | Tactile switch |
| U1 | ESP32-S3-WROOM-1U | |
| U2 | MAX1551EZK+T | LiPo Charge IC |
| U3 | RT9080-33GJ5 | Voltage regulator |
| U4 | WS2812B | RGB LED |
| Q1 | CJ2301 | P-channel FET |
