Internet of Things with ESP32

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Historical

For historical purposes, old and obsolete ESP32 & ESP31B information is retained herein. This includes documenting ESP32 related hardware that is no longer available (e.g., ESP31B & ESP-WROOM-03), never was available (e.g., ESP3212, ESP3207 & ESP3201), or may still be available but deprecated otherwise (e.g., unsold ESP3212 breakout boards).

Hardware

Chip
Identifier  Processor 
Cores
Embedded
Flash Mem.
Package
Size
Notes Status
ESP31B Dual-core 0 MiB 6 mm × 6 mm ✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
❌ Available: No
(limited distribution for testing)

Module Boards
Maker Model Flash Memory Antenna EM Shield Notes Status
Espressif ESP-WROOM-03 4 MiB
FM25Q32
MIFA No Shield
  • Pre-release beta test module; used ESP31B chip.
  • FCC Part 15.247 tested; FCC ID: 2AC7Z-ESP32.
  • Antenna: Meandered Inverted-F (PCB trace)
  • Pinout poster
  • Availability: No longer available. Module was previously released in limited quantity to beta testers.
✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
❌ Available: No
(limited distribution for testing)
Ai-Thinker ESP3201 4 MiB
(presumed)
SMA conn. No Shield
  • Availability: Unreleased; no evidence of manufacture; presumably deprecated.
  • Antenna: SMA connector (for external antenna)
    No on-board antenna.
  • Connections broken out into two double-row male headers. (Unlike the surface-mount style castellated edges used by most modules.)
✅ Designed: Yes
❓ Built: Unknown
❌ Shipped: No
❌ Available: No
ESP3207 4 MiB
25Q32FVSIG
Ceramic
U.FL conn.
Shielded
  • Availability: Unreleased; no evidence of manufacture; presumably deprecated in favor of ESP-32E.
  • Antennas:
    • RainSun ceramic antenna
    • U.FL (IPX) connector for an external antenna
  • Name origin: Designed to have a similar antenna solution as the Ai-Thinker ESP-07 (ESP8266) module. Hence the "07" suffixed to "ESP32", resulting in this module's name.
✅ Designed: Yes
❓ Built: Unknown
❌ Shipped: No
❌ Available: No
ESP3212 4 MiB
25Q32FVSIG
MIFA Shielded
  • Availability: Unreleased/scrapped. Replaced by ESP-32S.
  • Even though photos show that this module board was built (at least briefly), the module was scrapped, and no modules are known to have reached the public. All known fulfillments of ESP3212 orders have received the ESP-32S module instead.
  • Do not buy any breakout boards that employ this module's footprint, since this module is not available.
  • Name origin: Module was based on ESP-12F design (form factor and PCB-trace antenna). Hence "12" suffixed to "ESP32", resulting in this module's name.
  • Antenna: Meandered Inverted-F (PCB trace)
  • Fewer connections than ESP-WROOM-32 and ESP-32S.
✅ Designed: Yes
✅ Built: Yes
❌ Shipped: No
❌ Available: No
(scrapped)
ESP-32E 4 MiB
(presumed)
Ceramic
U.FL conn.
(presumed)
Shielded
(presumed)
  • Rumored module with U.FL (IPX) antenna connector.
  • Presuming inclusion of ceramic antenna, since this would be consistent with the hardware features of the deprecated Ai-Thinker ESP3207 module design.
  • Availability: Unreleased
    No concrete information on development status. (Considered dead until news otherwise.)
❓ Designed: Unknown
❓ Built: Unknown
❌ Shipped: No
❌ Available: No

Development Boards (Not SMT Module-Based)
Maker Model Flash Memory Antenna USB⇔UART Notes Status
Opk ESP32 Development Board 4 MiB IFA SiLabs CP210X
  • Development board designed with on-board USB-to-UART, Reset and IO0 buttons, battery connector, and WS2812 RGB LED.
  • Availability: Unreleased. Designed, but work on this project was halted.
✅ Designed: Yes
❌ Built: No
❌ Shipped: No
❌ Available: No

Development Boards (SMT Module-Based)
Maker Model SMT Module USB⇔UART Notes Status
Kilobyte
Benjamin Marty,
a.k.a. Berkutta
ESP32 Breakout ESP-WROOM-32 SiLabs
CP2102N
✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
❌ Available: No
Microwavemont ESP32 Monster Board ESP-WROOM-32 SiLabs
CP2102
(previously used FT231XS)
✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
❌ Available: No
ESP32 CAN CAN Board ESP-WROOM-32 FTDI
FT231XS
✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
❌ Available: No
ESP32-ADB Type R ESP-WROOM-32 FTDI
FT231XS
  • ESP32 audio development board with high-resolution DAC (TI PCM5102A), two MEMS I²S microphones (Knowles SPH0645LM4H-B) for recording audio, on-board LiPo battery charger, and 132×64 pixel display (SH1106 OLED).
  • Hackaday.io project
  • Video: ESP32-ADB Type R "Megaphone"
✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
❌ Available: No

Development/Breakout Boards for the ESP3212 Module
⚠️ Do not buy these boards unless you intend to craftily re-purpose them. The Ai-Thinker ESP3212 module was scrapped and replaced by the Ai-Thinker ESP-32S module. The ESP-32S module (a clone of the ESP-WROOM-32) has an entirely different footprint from the ESP3212, which makes any boards fabricated using the ESP3212 footprint obsolete and rather useless now. So, don't make board designs around the ESP3212 module; design for the ESP-WROOM-32/ESP-32S module footprint. Although all of the boards listed below were made, they obviously lacked the ESP3212 module.
Maker Model Notes Status
Black Electronics ESP3212 Breakout
  • Basic breakout board for scrapped Ai-Thinker ESP3212 module.
  • Headers on this board are intended to be soldered such that the module side of the board would be the bottom (face down toward the breadboard); thus allowing the side with pinout labels to be readable on top.
✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
✅ Available: Yes
Explore Labs ESP3212 Breakout ✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
✅ Available: Yes
Falkenad
Brettan Falkenberg
ESP3212 Breakout Board v1
  • Development board design contains an FT231X USB to UART IC, an auto-reset circuit, space for a JST battery connector underneath, and a 600 mA / 3.3 V linear regulator.
  • Bare board available from OSH Park.
✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
✅ Available: Yes
HydraBus HydraESP3212 ✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
✅ Available: Yes
Opk ESP3212 Breakout Board ✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
❌ Available: No
Piers Finlayson ESP3212 Breakout Board ✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
✅ Available: Yes
Seeed Studio ESP3212 Extension Board
  • Breakout board for scrapped Ai-Thinker ESP3212 module.
  • Connections available to solder on two Grove connectors.
  • Never released because ESP3212 was scrapped and replaced by ESP-32S.
✅ Designed: Yes
✅ Built: Yes
❌ Shipped: No
❌ Available: No
Teknoid ESP3212 Breakout Board
  • Breakout board for scrapped Ai-Thinker ESP3212 module.
  • Breadboard friendly with silkscreen on top for pinouts.
  • 2 × 15 male header pins included (not soldered).
  • Size: 38 mm × 30 mm × 1.2 mm (PCB thickness)
✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
✅ Available: Yes

Other ESP3212 Artifacts

Crusty Links (ESP32)

Old Links From Beta Testing Period (ESP31B)