The Internet of Things with ESP32

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Graveyard

For historical purposes, obsolete ESP32 & ESP31B information is retained herein this "graveyard". 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 2 0 MiB 6×6 mm² ✅ Designed: Yes
✅ Built: Yes
✅ Shipped: Yes
❌ Available: No
(limited distribution for testing)

Module Boards
Maker Model Flash Memory Antenna EMI Shield Notes Status
Espressif ESP-WROOM-03 4 MiB
FM25Q32
MIFA No
  • Pre-release beta test module; used ESP31B chip.
  • FCC Part 15.247 tested; FCC ID: 2AC7Z-ESP32.
  • Antenna: Meandered Inverted-F (PCB trace)
  • 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
  • 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.
Yes
  • 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 Yes
  • 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)

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/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
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 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

Other ESP3212 Artifacts

Crusty Links (ESP32)

Old Links From Beta Testing Period (ESP31B)