repa6 / ESP32-Generic

Simple generic ESP32 based PCB design, ideally suited to battery use.

ESP32-Generic

Software and hardware for generic ESP32 usage. Software based on ESP32-RevK library.

Hardware

Various KiCad designs, with 3D printed case designs.

• USB-C connection for power and also debug/serial.
• Alternative external DC supply 4V to 60V (safe to connect at same time as USB-C)
• On board RGB LED.

ESP32-Generic

• Very small size (29mm x 19mm PCB, plus antenna)
• ESP32-WROOM-32 design
• 6 pin connector (SPOX 2.5mm or 0.1"), which are GND and 5xGPIO
• Pads to allow linking one pin to DC supply (and not linking to GPIO)
• Pads to allow linking other pins to 3.3V, e.g. pull ups, or to power somethign external
• Pad to allow linking one pin to GND, e.g. capacitor

ESP32-Generic2

• Larger PCB (35.5mm x 22.5mm, plus antenna)
• ESP32-WROOM-32 design
• Two 8 pin connectors (SPOX 2.5mm or 0.1"), which are all connected to GPIO
• Pad (pre-bridged) linking one pin on each side to GND, can be cut
• Pad allowing one pin to link to DC supply (need to cut the series pad to disconnect from GPIO)
• Pad allowing one pin to link to 3.3V, e.g. pull up, or to power somethign external

ESP32-Generic3

• Larger PCB (35mm x 21.5mm, plus antenna)
• ESP32-NANO-PICO based design
• 2 pin connector for DC (SPOX 2.5mm or 0.1")
• 10 pin GPIO connector (SPOX 2.5mm or 0.1")
• Pads to allow a GPIO to be tied to GND and one to be tied to 3.3V to power a separate device if needed

ESP32-LowPower

Same as ESP32-Generic but for low power battery working.

• FET switched potential divide for ADC reading battery supply.
• Can work with USB chip disabled (power via DC connector instead)
• Approx 35uA on 9V battery in sleep mode

ESP32-USBA

Unlike the rest this is a much simpler PCB, PCB designed for direct plug in to USB-A socket.

• RGB LED
• Button

Copyright © 2019-22 Adrian Kennard, Andrews & Arnold Ltd. See LICENCE file for details. GPL 3.0