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KeeYees ESP32S ESP32 Development Board 2.4 GHz Dual Core WLAN WiFi + Bluetooth 2-in-1 Microcontroller ESP-WROOM-32 Chip for Arduino (38PIN Narrow Version, 2PCS)

4.4 out of 5 stars 879 ratings
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Size: 38 PIN Narrow
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Purchase options and add-ons

Brand KeeYees
Ram Memory Installed Size 512 GB
Memory Storage Capacity 512 KB
CPU Speed 2.4E+2 MHz
Connectivity Technology Bluetooth, WLAN

About this item

  • This module is safe, reliable, and scalable to a variety of applications.
  • The module has 38 pins and has more features than a 30-pin module. Narrower width, compatible with breadboard
  • Support Lua program, easy to develop. Support of three modes: AP, STA and AP + STA.
  • This board is used with 2.4 GHz dual-mode Wi-Fi and Bluetooth chips ESP-WROOM-32, as well as the 40nm low-power technology.
  • Technical Support: Our PDF tutorial is available on this page. Please pull down this page to find the tutorial: User Guide (PDF)
› See more product details

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Customer Ratings
4.44.4 out of 5 stars879
4.44.4 out of 5 stars879
4.44.4 out of 5 stars90
4.44.4 out of 5 stars26
3.83.8 out of 5 stars28
4.54.5 out of 5 stars248
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Product information

Technical Details

Collapse all
Summary
Processor ‎2.4E+2
Memory Speed ‎240 MHz
Wireless Type ‎802.11bgn
Other Technical Details
Brand ‎KeeYees
Operating System ‎FreeRTOS
Item Weight ‎1.13 ounces
Product Dimensions ‎1.9 x 1 x 0.47 inches
Item Dimensions LxWxH ‎1.9 x 1 x 0.47 inches
Color ‎Pack of 2
Processor Brand ‎Espressif
Number of Processors ‎2
Manufacturer ‎KeeYees
ASIN ‎B07QCP2451
Date First Available ‎April 8, 2019

Additional Information

Customer Reviews
4.4 out of 5 stars 879 ratings

4.4 out of 5 stars
Best Sellers Rank

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here

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KeeYees ESP32S ESP32 Development Board 2.4 GHz Dual Core WLAN WiFi + Bluetooth 2-in-1 Microcontroller ESP-WROOM-32 Chip for Arduino (38PIN Narrow Version, 2PCS)

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Product Description

Keeyees
esp32 board

Features:

  • Complete microcontroller with WLAN (802.11bgn) and Bluetooth (Classic and LE).
  • Reset and boot buttons are available, so a new firmware can be quickly and easily installed.
  • The development board combines a CPU with 2 Tensilica LX6 cores, clocked at up to 240 MHz, and 512 kilobytes SRAM in a single microcontroller chip.

PDF tutorial: Our PDF tutorial is available on this page. Please pull down this page to find the tutorial User Guide (PDF)

Package Include :

  • 2 x ESP32 Development Board
Breadboard

When Combined with a Breadboard

This version of the board is the only breadboard-compatible version among the many ESP-WROOM-32 development boards. This is thanks to its narrower width.

At the same time, this board has 38pins and has more features than a 30pins version board.

i/o shield

When Combined with a Breakout Board

KeeYees technical team specially designed a breakout board for this version of ESP32 Board, just to make your project more convenient.

This breakout board can expand one GPIO pin of esp32 development board to two, which is convenient for users to reuse all pins in smart home projects. Nice breadboard alternative.

KeeYees Mini ESP8266 Development Board
KeeYees ESP8266 Development Board
KeeYees ESP32 Development Board
KeeYees ESP32 Breakout Board
KeeYees ESP32 Breakout Board
Buying Options
Customer Reviews
4.4 out of 5 stars 141
4.6 out of 5 stars 1,449
4.4 out of 5 stars 879
4.3 out of 5 stars 218
4.3 out of 5 stars 218
Price $14.99 — no data $11.99 $11.99 $11.99
Size 34*25.5 mm 48*25.5 mm 48*25.5 mm no data no data
Pin Resources 16 Pin 30 Pin 38 Pin 38 Pin 30 Pin
WiFi ✓ ✓ ✓ no data no data
Bluetooth X X ✓ no data no data
Interface Micro USB Micro USB Micro USB no data no data

What's in the box

  • 2 x KeeYees ESP32S ESP32 Development Boards

    • Product guides and documents

    User Guide (PDF)

    Customer reviews

    4.4 out of 5 stars
    879 global ratings

    Review this product

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    Customers say

    Customers report that the development board works well with Home Assistant/ESPHome. The build quality and value for money receive mixed feedback - while some find it well-made and worth the low price, others report poor quality and consider it worthless.

    Select to learn more

    FunctionalityBuild qualityValue for money
    53 customers mention "Functionality"42 positive11 negative

    Customers find that the development board works great, particularly with Home Assistant/ESPHome, and one customer mentions it runs reliably for their sample size.

    "The best works as descripted" Read more

    "...They work just fine. I like the little sticky tapes with the pin names on them. A few tips:..." Read more

    "...The chip is reported as model ESP32-D0WDQ6 Rev 1. Both boards work fine. Update 2022-11-23: I bought two more boards for a total of four...." Read more

    "...Reset doesn't work across the cable either, but the button to the left resets it and finally blink (my hello world goto) sketch is working." Read more

    24 customers mention "Build quality"16 positive8 negative

    Customers have mixed opinions about the build quality of the development board, with some finding it well-made and reliable, while others report poor quality.

    "...They have 4MB of flash storage. Excellent quality/value." Read more

    "Very shoddy packaging and quality of the boards. Both boards came with short styrofoam and pins overhanging...." Read more

    "...for years, and so far it looks like their ESP32s are similarly well-enough made...." Read more

    "The board build quality is decent, but I didn't expect much. It works...." Read more

    21 customers mention "Value for money"12 positive9 negative

    Customers have mixed opinions about the value for money of the development board, with some finding it well worth the very low price while others consider it worthless.

    "Cool product, fairly easy to work with. i built a more code keyer in 2 days." Read more

    "...There are labels on the bottom, though this isn't very helpful...." Read more

    "...It's an amazing little board when used with HA/ESPHome...." Read more

    "...Just not worth the irritations." Read more

    My favorite ESP32S - 38 pin narrow dev board when I need prime shipping.
    5 out of 5 stars
    My favorite ESP32S - 38 pin narrow dev board when I need prime shipping.
    I have a dozen or two of these. More reliable than many I tried from Aliexpress. These are only a couple bucks more the Ali and are consistent, the number and config of GPIO pins I want (38) and the narrow board that leaves one row on both sides of a standard breadboard or perma-proto boards. I use these for wled with sound reactivity and other unique custom features and for my own CircuitPython (or MicroPython) scripts or my embedded development experiments using the Rust Programming Language. Super dependable board --100% working reliably for my sample size of about 20 KeyYees ESP32S - 38 pin NARROW. Highly recommend and check out associated breakout board from KeyYees for this exact board
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    Top reviews from the United States

    • Timothy P. Jackson
      5.0 out of 5 stars The best works as descripted
      Reviewed in the United States on June 5, 2025
      Size: 38 PIN NarrowVerified Purchase
      The best works as descripted
      Helpful
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    • WCat
      5.0 out of 5 stars Just received my first 2 units and both work great
      Reviewed in the United States on June 23, 2023
      Size: 38 PIN NarrowVerified Purchase
      I just received my first two this afternoon, and uploaded several sketches to both. They work just fine. I like the little sticky tapes with the pin names on them. A few tips:

      1) For those that complain about pressing the right-hand button to start an upload in the Arduino UI, this is very common, not a quirk in these particular boards. Not a big deal, really. Watch your sketch compile, then when it starts to upload, press the right-hand "boot" button for a few seconds. In my case, I hold the button until I see upload progress start, then let go. Nothing to it.

      2) The on-board blue LED is connected to D2, by the way. Try the "blink" sketch first, and just change the default pin name or number to 2 instead of whatever the sketch default is.

      3) When deciding what flavor of ESP32 board to select in the Arduino UI, I just use the generic "ESP32 Dev Module" and everything works fine for me. I have several other ESP32 modules, like the WROOM, and they all work with the Dev Module selection for me. Easy.

      4) I also tried the very simple Wi-Fi server that can flash the on-board LED (no external connections needed) by going to Examples/WiFi/SimpleWiFiServer. Change the default pin 5 to pin 2 in several places, and then put in your home Wi-Fi SSID and your password. Enable the serial monitor for 115200 bps, and upload it. Once it connects, the ESP32 will tell you what its IP address is. Enter that IP address (like 192.168.1.123) in your phone or computer web browser, and you'll get a simple page coming from your ESP32 (which is now an HTTP server). The page tells you something like "click here to turn LED D2 on" (assuming you edited your sketch so that it says "D2" instead of D5) and a similar line to turn the LED off. Nothing to it, and you did this with zero hardware!

      5) My modules did not have any labeling or silkscreen on them, but the included sticky labels are just fine. I stuck one set on the bottom of one module, and on the connector edge of the other. They are sticky enough that I'm not worried about them falling off.

      I really like these units, and will definitely buy more! I also bought a pair of the KeeYees breakout boards with screw terminals, and they perfectly match the pinout of these 38pin modules.
      21 people found this helpful
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    • Juan Jimenez
      5.0 out of 5 stars Great little product
      Reviewed in the United States on April 25, 2025
      Size: 38 PIN NarrowVerified Purchase
      Cool product, fairly easy to work with. i built a more code keyer in 2 days.
      Helpful
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    • CloudMaker
      4.0 out of 5 stars Good board; few quirks - Arduino working notes
      Reviewed in the United States on May 6, 2021
      Size: 38 PIN NarrowVerified Purchase
      Writing what I got working because the Amazon reviews were the best to getting this working for me. Tried on both Windows 10 and Ubuntu Linux 18.04. Ultimately all my issues came down to a bad USB cable. Writing what SHOULD work to help others. I'm writing this for Windows 10 though I'm sure it'd work fine on Linux now that I have a good cable.

      Go into device manager on Windows 10. When you plug the cable in, device manager should refresh and notice a device is attached. If it does nothing, get another USB cable. When it works, you should have a "Ports" section and CP210x USB to UART bridge and a com port. If you don't have that, nothing in arduino or any other program will work. Keep troubleshooting cable and driver until you get there.

      When I did finally get that working I installed esp32 from boards manager in arduino (need to add the additional boards link ... google for it). I selected the port and FireBeatle ESP32. When uploading code to it, you have to push the IOO port (the one to the right of the USB connector) and hold it when Arduino gets to "Uploading" your sketch. It's a little awkward to hold this so it's best to have it in a breadboard to do this. Reset doesn't work across the cable either, but the button to the left resets it and finally blink (my hello world goto) sketch is working.
      8 people found this helpful
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    • AzPsdnym
      5.0 out of 5 stars Both boards passed my simple initial tests
      Reviewed in the United States on September 21, 2022
      Size: 38 PIN NarrowVerified Purchase
      I had to install the CP210x USB-to-serial driver to get Windows 10 to see the device on a COM port. Also, when the Arduino IDE started trying to upload my program to the board, when the IDE output said "Connecting...", I had to press the right pushbutton on the board, for a couple of seconds, in order to allow uploading to occur. Other than those two not-serious gotchas, the board seems to work as expected. (I tested getting chip info, doing an http get via WiFi, and deep sleep with timer wakeup.) The chip is reported as model ESP32-D0WDQ6 Rev 1. Both boards work fine.

      Update 2022-11-23: I bought two more boards for a total of four. All 4 have functioned well without any known reliability problems. (I'm using WiFi, digital GPIO usage, internal LED, flash updates, NVS changes.) THESE THINGS ARE GREAT!

      Update 2022-12-08: I bought two more boards. 6 out of 6 have worked flawlessly. I wrote custom motion sensor software using PlatformIO...flashing from PlatformIO works flawlessly OTA or wired. Every pinout has behaved as expected.

      Update 2024-10-13: I've purchased five batches of 2 boards (10 boards in total) over the past two years, and all of them have worked flawlessly. They are 38-pin narrow boards (25.4mm/1in wide), unlike many of the other boards that are 2.54mm/.1in wider than this one. So these fit nicely on a 400 point breadboard, leaving a usable wire point adjacent to each pin on both sides of the board after it's been seated into the breadboard. They have 4MB of flash storage. Excellent quality/value.
      7 people found this helpful
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    • Simon Funk
      5.0 out of 5 stars Works, reliable, flashes with no button pressing (on linux)
      Reviewed in the United States on November 15, 2023
      Size: 30 PINVerified Purchase
      I got these to replace some nearly identical ones from a different seller which had super flaky wifi (it turned out due to counterfeit USB chip leaking high voltage to the ESP32). I'm happy to report that, despite having a no-name USB chip (CP2102 clone, I think) all the voltages measure as they should (unlike the other brand) and the units work so far flawlessly. I bought these from KeeYees this time because I had purchased some ESP8266s from them a long time ago which have worked great for years, and so far it looks like their ESP32s are similarly well-enough made.

      So, if you are scratching your head over which brand of this board to buy when there seem to be so many that are exactly the same: Beware they may be the same design but the components matter, and so far for me at least KeeYees has sent me good, working boards, spanning multiple years, which I can't say for some other random brands/sellers.
      4 people found this helpful
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    Top reviews from other countries

    • BlondieSL
      5.0 out of 5 stars These work nicely, but can get very warm with WiFi use.
      Reviewed in Canada on March 1, 2023
      Size: 38 PIN NarrowVerified Purchase
      I only started using ESP32 a few months ago, coming from an Arduino background.
      I have to say, I love these boards!
      They are much faster than any Arduino, have dual cores which are easy to use and having Bluetooth and WiFi (transceiver radios) makes them easy to use.

      With Arduino, I was using nRF24L wireless boards and found them glitchy and the libraries not as stable as one might like. I pretty much gave up on them because one day, communications were perfect, then all of a sudden, without any logical reason, comms would just stop or get glitchy.

      I moved to the ESP32 and found that configuring communications (either using WiFi to the router or using peer-to-peer) was so easy and STABLE! Configuring the radios is so simple and you don't need a lot of code to do so.

      The only downside I see with this particular brand, is that when using the radios, the chip can get pretty hot.
      These manufacturers should offer a heat sink for the chip.
      When being enclosed in a case, this could be a problem, so adding a heat sink and MAYBE a tiny fan might be a good idea.

      All in all I do recommend these. I did end up buying more and intend to buy more yet.
      Report
    • Frank Thompson
      5.0 out of 5 stars Great value
      Reviewed in Canada on December 29, 2024
      Size: 38 PIN NarrowVerified Purchase
      Nice boards for random projects. Seem like good quality and nicely packaged so the pins don’t get bent out of shape or broken.
      Report
    • Andree Sullivan
      4.0 out of 5 stars Onboard capacitor isn't big enough, suffers from brownouts in some situations
      Reviewed in Canada on March 18, 2024
      Size: 38 PIN NarrowVerified Purchase
      The onboard capacitor across EN isn't big enough. This means that in some situations, with certain things hooked up to certain pins, you will not be able to flash the chip from your PC without pressing the boot button. When the chip is brand new you can flash without any button press, but sometimes you can't.

      Similarly, if you hook up too many devices that try to draw too much current, again the capacitor on this dev board isn't big enough to handle spikes, and you will get Brownout Detector error messages on the serial and bootloops. I got this just from simply having a TFT backlight connected and trying to connect to wifi. You can fix this by installing a bigger capacitor yourself, even off-board, or using a stronger USB power supply, but these dev boards really struggle with weak USB ports like those on a PC or laptop.

      The 38 pin narrow layout is nice, gets you more room on your breadboard than traditional WROOM modules (this chip doesn't say WROOM on it though). And more pins than usual, although some of them aren't even usable or necessary (IE pins only for flashing direct to memory yourself, not GPIO). However there are no pin labels on the top, they come on sticky papers that you have to peel off and apply yourself, only the bottom of the board has pin labels, which obviously are not visible when installed on a breadboard.

      Good price, decent boards, convenient layout, but sometimes minor power problems in some projects. Fixable, but annoying.
      Report
    • Bill Sullivan
      5.0 out of 5 stars my favorite brand, KeeYees #1
      Reviewed in Canada on August 20, 2024
      Size: 38 PIN NarrowVerified Purchase
      These just work. easy to program, come with pins pre soldered for easy wiring. I have been able to power small projects with only using the USB port for power. They seem to be protected well cause even with hot swapping, shorting out or reverse polarity they just reboot and keep on truckin.
      Report
    • Nathan Kohlman
      5.0 out of 5 stars Had an issue, was resolved very quickly!
      Reviewed in Canada on February 4, 2022
      Size: 38 PIN NarrowVerified Purchase
      I purchased a 2 pack of these ESP32 boards as well as some ESP8266 and ESP8266 Mini boards. I started with the ESP32, followed the provided instructions, got everything setup in Arduino IDE but was having issues sending code to the board. I scoured the internet looking for solutions and tried all sorts of solutions without any luck. I was about to pack them up for a return when I figured I would try the other board in the package. It worked straight away. So i opened and tested all of the esp8266 boards and they all worked just fine.

      I emailed the seller and they emailed me a copy of the user document that I had already downloaded. I mentioned that I tried that and just one of the boards was not functioning correctly. Without hesitation they just refunded me the cost of one of the boards. I followed by ordering another 2 pack, which showed up and tested just fine.

      Will definitely purchase again!
      Report