Module: WROOM-32E, WROOM-32 or WROVER

WROOM-32E uses the newer chip revision and is the right choice for new designs. Older WROOM-32 boards are fine for learning. WROVER modules add 4 to 8 MB of PSRAM, which you want for cameras, large web pages and audio buffers. A “U” suffix means a U.FL connector for an external antenna.

USB Chip and Connector

The CP2102, CH340 and CH9102 all work, but each needs the right driver on Windows and macOS. CP2102 and CH9102 boards tend to upload more reliably at high baud rates. USB-C saves you hunting for micro-USB cables; check that it’s a data cable, not charge-only.

30-Pin vs 38-Pin

38-pin DevKitC boards expose every usable GPIO, including the flash pins you shouldn’t touch. 30-pin boards drop a few rarely used pins and are slightly smaller. Most are too wide to leave a free row on both sides of one breadboard, so use two breadboards or an expansion base.

Auto-Reset and Boot

Good boards wire the USB chip’s DTR and RTS lines to EN and GPIO0 so uploads start automatically. Cheap boards sometimes need you to hold BOOT while flashing. If uploads fail with “waiting for packet header,” try holding BOOT or adding a 10 µF capacitor between EN and GND.

Power and Sleep Current

The ESP32 chip itself sleeps at microamps, but the regulator, USB bridge and power LED on most dev boards draw far more. For battery projects, choose a board with a published low sleep current or plan your own board around a bare module.

With 1,650+ ratings (about 4.4 stars), HiLetgo’s ESP-WROOM-32 board is one of the most-bought ESP32 boards on Amazon, and that history matters: pinout diagrams, YouTube tutorials and forum fixes for this exact board are everywhere. It’s the classic DevKit-style design with the WROOM-32 module, a USB-to-UART bridge, BOOT and EN buttons and a power LED, and it supports AP, STA and AP+STA Wi-Fi modes plus dual-mode Bluetooth. It uses micro-USB rather than USB-C and the older module revision, so treat it as a learning and hobby board. Stock was low (6 left) when we checked.

Hosyond’s 30-pin ESP-WROOM-32 3-pack is the budget pick for people who want several boards for sensor nodes, ESP-NOW networks or student kits (about 4.6 stars from 165 ratings). It uses the reliable CP2102 USB-to-UART chip on micro-USB, so drivers are easy on every OS. The 30-pin layout is the one many beginner tutorials and pinout diagrams are drawn for, and it’s slightly smaller than 38-pin DevKitC boards. You give up USB-C and a few rarely used pins, and pin order varies between 30-pin board makers, so match your wiring to Hosyond’s pinout image.

For a class, a workshop or a home with lots of automation nodes, this 6-pack of 38-pin ESP32 boards keeps the per-board cost down while still giving you USB-C and a CP2102 bridge (about 4.4 stars from 73 ratings). The seller highlights a narrower body than standard DevKitC boards, which makes it easier to fit on a breadboard with jumper space on both sides, a common pain point with ESP32 boards. You get all 38 pins, so the full GPIO set is available for sensors, displays and relays. As with any generic multi-pack, quality control varies, so test each board with a blink sketch before handing them out.

When an ESP32 has to live in a metal box, a garage, a greenhouse or the far end of your yard, the PCB antenna is often the weak link. HiLetgo’s DevKitC V4 with the ESP32-WROOM-32U swaps the PCB antenna for a U.FL connector, so you can fit a 2.4 GHz antenna on a pigtail and mount it outside the enclosure. Everything else matches the standard DevKitC, with I/O broken out on both sides. It holds about 4.4 stars from 116 ratings. Antennas are usually not included in the listing, and running the board without an antenna attached can give very poor Wi-Fi, so order a U.FL antenna or pigtail with it.

The classic AI-Thinker ESP32-CAM works, but it has no USB port and needs a separate programmer. Freenove’s ESP32-WROVER camera board fixes that with a full-size board that has a USB code uploader, the camera connector and a microSD slot on one PCB. The WROVER module adds 8 MB of PSRAM on top of 4 MB of flash, which the esp32-camera driver needs for higher resolutions and frame buffers. The kit includes a 1 GB card and card reader plus downloadable tutorials (about 4.2 stars from 200+ ratings). It’s the easiest way to run our ESP32-CAM tutorials on a board that plugs straight into USB. Stock was limited when we checked.

The original LILYGO T-Display is still one of the most useful ESP32 boards ever made. It puts a 1.14 inch 135 × 240 ST7789V IPS LCD right on the board, adds two user buttons, USB-C through a CH9102F bridge, a JST connector for a LiPo battery with voltage sensing, and 16 MB of flash per the Amazon listing. LILYGO quotes about 67 mA while running and around 350 µA in sleep. That makes it a ready-made weather display, crypto or stock ticker, Wi-Fi scanner or ESPHome status screen, and the TFT_eSPI library supports it out of the box (about 4.6 stars from 225 ratings). If you want a bigger, faster screen and more RAM, see the T-Display-S3 in our ESP32-S3 guide.

The ESP32-2432S028R, nicknamed the Cheap Yellow Display (CYD) for its yellow PCB, is the cheapest way to get an ESP32 with a real touchscreen. The board pairs an ESP32-D0WDQ6 with a 2.8 inch 240 × 320 LCD and resistive touch panel, plus a microSD slot, an RGB LED, a light sensor and a speaker connector. A large community project on GitHub documents its pins and provides LVGL, TFT_eSPI and ESPHome examples, which is why it’s become a favorite for Home Assistant control panels, smart thermostats and game projects. This DIYmall listing has about 4.5 stars from 110+ ratings. Resistive touch needs a firmer press than capacitive, free GPIOs are scarce, and display driver variants differ between batches, so check the CYD community notes for your revision.

The LILYGO T-Beam turns an ESP32 into a long-range tracker. Alongside the ESP32 with 4 MB flash and 8 MB PSRAM, it carries a Semtech SX1276 LoRa radio at 915 MHz and a u-blox NEO-6M GPS module, which together make it one of the most popular boards for Meshtastic off-grid messaging, LoRaWAN asset trackers and GPS loggers (about 4.5 stars from 190+ ratings). The ESP32’s Wi-Fi and Bluetooth stay available, so you can pair a phone over BLE while LoRa handles the long-distance link. Make sure you buy the frequency that’s legal in your country (915 MHz is for the Americas and parts of Asia-Pacific; Europe uses 868 MHz), always connect the antenna before powering the radio, and note that LILYGO’s newer T-Beam Supreme moves to the ESP32-S3.

Wi-Fi isn’t always the right answer. The WT32-ETH01 uses the original ESP32’s built-in Ethernet MAC with an onboard PHY and an RJ45 jack, giving you a stable 10/100 Mbps wired connection for network gateways, Modbus TCP bridges, Bluetooth proxies for Home Assistant, or devices in places with poor Wi-Fi. It has 4 MB of flash, keeps Wi-Fi and Bluetooth available, and is well supported by ESPHome, Tasmota and ESP-IDF’s Ethernet driver (about 4.4 stars from 55 ratings). The important catch: there is no USB port, so you need a 3.3 V USB-to-UART adapter to flash it, and you must pull IO0 low to enter boot mode. The board also has no Power over Ethernet, so plan a 5 V or 3.3 V supply.

The M5Stack ATOM Lite is a finished 24 × 24 mm ESP32 device built on the ESP32-PICO-D4 system-in-package, with an IR transmitter, an RGB LED, a programmable button, a Grove port and USB-C, all in a plastic case. It has become a Home Assistant favorite: flash ESPHome and it makes a tidy Bluetooth proxy that extends BLE sensor coverage around your home, an IR blaster for air conditioners, or a one-sensor node using M5Stack’s Grove units (about 4.4 stars from 70+ ratings). Because the ESP32 is original silicon, it also supports Bluetooth Classic. Only a handful of GPIOs are exposed, so it’s best for single-purpose devices, and stock was low when we checked.

Learning ESP32 or ESP-IDF?

Get the ELEGOO USB-C 3-pack. If the project may become a product, prototype on the DevKitC-32E instead.

Need many boards cheaply?

The Hosyond 30-pin 3-pack or the 38-pin USB-C 6-pack for classrooms and multi-node homes.

Poor Wi-Fi or a metal enclosure?

The DevKitC ESP32-32U with an external antenna, or the WT32-ETH01 for a wired connection.

Camera project?

The Freenove WROVER camera board for a USB-friendly ESP32-CAM alternative with 8 MB PSRAM.

Need a screen?

T-Display for small status screens, the Cheap Yellow Display for a low-cost touchscreen panel.

Long range or Home Assistant?

T-Beam for LoRa, GPS and Meshtastic; ATOM Lite for ESPHome Bluetooth proxies and IR.

Is the original ESP32 still worth buying?

Yes, for many projects. It’s the cheapest, best-documented ESP32, and it’s the only common one with Bluetooth Classic, a built-in Ethernet MAC and true DAC outputs. Choose an ESP32-S3 instead if you need native USB, lots of RAM, displays or cameras with good performance, or AI; choose an ESP32-C6 for Matter, Thread, Zigbee or Wi-Fi 6.

What’s the difference between WROOM-32, WROOM-32E and WROVER?

All three contain the same dual-core ESP32 family. WROOM-32 is the original module; WROOM-32E uses the newer chip revision and is Espressif’s choice for new designs. WROVER modules add external PSRAM (typically 8 MB), which helps with cameras, audio and large buffers but uses GPIO16 and GPIO17. A “U” version of any module replaces the PCB antenna with a U.FL connector.

Why won’t my computer detect my ESP32 board?

The three usual causes are a charge-only USB cable, a missing USB-to-UART driver (install the CP210x, CH340 or CH9102 driver that matches your board), or a faulty USB port or hub. If the board is detected but uploads fail, hold the BOOT button while the upload starts. Our ESP-IDF install guide for Windows walks through drivers and port selection.

Which ESP32 pins should I avoid?

Don’t use GPIO6 to GPIO11, which connect to the flash chip. GPIO34 to GPIO39 are input-only with no internal pull-ups. GPIO0, GPIO2, GPIO5, GPIO12 and GPIO15 are strapping pins that affect boot, so avoid pulling them the wrong way at reset. ADC2 channels stop working while Wi-Fi is active, so use ADC1 pins for analog readings, as shown in our ESP32 ADC tutorial.

Can I use Bluetooth Classic and BLE on these boards?

Yes. Every board in this guide uses the original ESP32, which supports Bluetooth 4.2 Classic (SPP serial, A2DP audio) and Bluetooth Low Energy. Follow our ESP-IDF Bluetooth Classic tutorial to control an LED from an Android phone.