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ESP32

Hacker Approved

The most recommended of 28 microcontrollers

A cheap microcontroller with Wi-Fi, Bluetooth, strong docs and many examples, often preferred over a Raspberry Pi when no OS is needed; battery projects can struggle with power draw.

A cheap microcontroller with Wi-Fi, Bluetooth, strong docs and many examples, often preferred over a Raspberry Pi when no OS is needed; battery projects can struggle with power draw.

225 people gave an opinion

recommend it
190
criticize it
35
approval share
84%
Each figure is 2 people. RecommendsCriticizes

Recommended in 12 of 13 months

  1. November 2025: recommended
  2. December 2025: recommended
  3. January 2026: recommended
  4. February 2026: recommended
  5. March 2026: recommended
  6. April 2026: recommended
  7. May 2026: recommended
  8. June 2026: recommended
  9. July 2026: recommended
  10. August 2026: recommended
  11. September 2026: recommended
  12. October 2026: recommended
  13. November 2026: not recommended (month in progress)

Owned for 5 years

Median of the 3 owners who said how long they have had it.

Each square is one year.

Why it carries the badge

  • 190 people recommend itNeeds 10 or more, met.
  • 5.4 recommenders for every criticNeeds 2 to 1 or better, met.
  • Recommended in 12 of 13 monthsNeeds 4 or more, met.

The same three rules apply to every product, and the badge can’t be bought. How the badge works

What people say about it

The reasons people give, with the number of comments that give each one. Open a reason to read what they said.

Why people recommend it

Each mark is one comment

  • Very cheap and widely available

    “if you're just trying to interface a bunch of pins to a usb port you can buy a pack of 3 USB-C ESP32s on amazon for like twenty bucks now”

    Comment from 1 Oct 2026 in “Price Increases for 2GB Raspberry Pi 4 and Raspberry Pi 5”

    “Super cheap from China and you can find them with all sorts of cool form factors with lipo battery chargers, screens, etc.”

    Comment from 9 Jan 2026 in “Embassy: Modern embedded framework, using Rust and async”

    “only those are guaranteed to have a lot of software support, documentation, easy availability on aliexpress etc. for cheap”

    Comment from 17 Aug 2026 in “A 3rd World Embedded Engineer Responds to "RISC-V They Should Have Known Better"”
  • Lighter alternative to Raspberry Pi

    “Love ESP boards, and with Raspberry pi pricing though the roof, I'm hoping more will discover the love of getting the job done on a 10mm2 package.”

    Comment from 3 Apr 2026 in “ESP32-S31: 320MHz 2C RV32IMAFCP+CLIC, 512KB SRAM, GbE, 802.11ax, 61 GPIO”

    “Almost everything that is unique to a Pi compared to an x86 mini PC seems like it makes more sense with an ESP device.”

    Comment from 28 May 2026 in “News about Raspberry Pi 6 and Microcontroller Development – Jeff Geerling”

    “They're the perfect alternative to a Raspberry Pi because they have WiFi, Bluetooth, lots of GPIO, and decent compute.”

    Comment from 19 Jul 2026 in “Clever hacker fits 537,000 domains in a $5 ESP32 ad-blocking dongle”
  • Surprising compute for the price

    “Espressif in particular has pushed MCUs up to a new level where it's become viable to run a designed-from-scratch web server”

    Comment from 11 Mar 2026 in “RISC-V Is Sloooow”

    “They're the perfect alternative to a Raspberry Pi because they have WiFi, Bluetooth, lots of GPIO, and decent compute.”

    Comment from 19 Jul 2026 in “Clever hacker fits 537,000 domains in a $5 ESP32 ad-blocking dongle”

    “the ESP32 is offering CPU power on par with many of the embedded-x86 SOCs that powered some of the early wifi routers”

    Comment from 28 May 2026 in “News about Raspberry Pi 6 and Microcontroller Development – Jeff Geerling”
  • Great docs, SDKs and examples

    “the ESP32 comes with top notch documentation and SDKs that will make beginners at least want to stay with Espressif's modified RTOS for a while”

    Comment from 3 Jun 2026 in “Roku LT Operating System open source distribution”

    “only those are guaranteed to have a lot of software support, documentation, easy availability on aliexpress etc. for cheap”

    Comment from 17 Aug 2026 in “A 3rd World Embedded Engineer Responds to "RISC-V They Should Have Known Better"”

    “esp32 are really nice: hundreds of code examples that do what you want without having to read too many pages”

    Comment from 12 Nov 2025 in “My fan worked fine, so I gave it WiFi”

What people warn about

Each mark is one comment

  • Power-hungry for battery projects

    “ESP32 has inherent sleep issues and before their latest chip (c6 I think) 'deep sleep' was really a gpio- or rtc- triggered boot followed by a power off.”

    Comment from 6 Nov 2025 in “IKEA launches new smart home range with 21 Matter-compatible products”

    “an esp32 on an 1100mah battery will last years on deep sleep, and about a day with wifi on and in high power modes.”

    Comment from 23 Apr 2026 in “A DIY Watch You Can Actually Wear”

    “It's not going to be as good on battery power but the barrier to entry for people wanting to tinker is really low.”

    Comment from 24 Apr 2026 in “A DIY Watch You Can Actually Wear”
  • Security and vendor dependence concerns

    “every single company I've worked which took security seriously (medical implants, critical safety industry) not only banned their use on our designs”

    Comment from 3 Apr 2026 in “ESP32-S31: 320MHz 2C RV32IMAFCP+CLIC, 512KB SRAM, GbE, 802.11ax, 61 GPIO”

    “Anything that's got wireless/bluetooth integrated is probably backdoored already, but the esp32 certainly has been”

    Comment from 12 Dec 2025 in “UK House of Lords attempting to ban use of VPNs by anyone under 16”

    “ESPs are great, but their hobbyist ecosystem ultimately relies on the goodwill of a Chinese company”

    Comment from 19 Nov 2025 in “The Death of Arduino?”
  • Limited processing power and bandwidth

    “An ESP32 mesh doesn't have nearly enough capacity to handle all the messages and multimedia flying around”

    Comment from 12 Mar 2026 in “Show HN: s@: decentralized social networking over static sites”

    “the ESP32 is fairly limited in a lot of ways due to the limited processing power and IO bandwidth”

    Comment from 13 Oct 2026 in “Turn a WiFi 7 Router into a 320Msps Software Defined Radio Receiver”

    “I found that the ESP32 and its whole WiFi stack (?) were slowing the device down.”

    Comment from 21 Nov 2025 in “Arduino published updated terms and conditions: no longer an open commons”

Other microcontrollers people recommend

The four most recommended other microcontrollers, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.

ESP32 compared with 4 alternatives
ProductRecommendCriticizeApprovalMonthsOwnedBadge
ESP32This page1903584%125 yrs3 ownersApproved
Arduino boards817353%1216 yrs7 owners—
Raspberry Pi Pico721682%12—Approved
Raspberry Pi RP2350471378%11—Approved
Raspberry Pi RP204029585%10—Approved
See all 28 microcontrollers, ranked

What people said

40 of the 265 comments that mention it, newest first. Each links to the original comment.

“tiny little ESP32 variant boards for a fraction of the cost and significantly less complexity”

RecommendsComment from 28 Oct 2026 in “Raspberry Pi Zero 3W and Pi 4 Model A spotted in device trees”

“they present something near-ish to the Pentium era of personal computing for a few dollars”

RecommendsComment from 26 Oct 2026 in “SIMD-accelerated computer vision on a $2 microcontroller”

“the success of things like ESP32 shows that good price + good enough is a powerful combination”

RecommendsComment from 20 Oct 2026 in “DeepInfer: High-performance inference framework for DeepSeek models”

“the ESP32 is fairly limited in a lot of ways due to the limited processing power and IO bandwidth”

CriticizesComment from 13 Oct 2026 in “Turn a WiFi 7 Router into a 320Msps Software Defined Radio Receiver”

“Among the cheapest and most easily available ways to get Wi-Fi or BT into your microcontroller project.”

RecommendsComment from 2 Oct 2026 in “Various Projects Find Hidden SDR Capabilities in ESP32 Microcontrollers”

“if you're just trying to interface a bunch of pins to a usb port you can buy a pack of 3 USB-C ESP32s on amazon for like twenty bucks now”

RecommendsComment from 1 Oct 2026 in “Price Increases for 2GB Raspberry Pi 4 and Raspberry Pi 5”

“only those are guaranteed to have a lot of software support, documentation, easy availability on aliexpress etc. for cheap”

RecommendsComment from 17 Aug 2026 in “A 3rd World Embedded Engineer Responds to "RISC-V They Should Have Known Better"”

“I've also seen people use an ESP32 to power on the system with a bluetooth controller which is pretty neat”

RecommendsComment from 2 Aug 2026 in “ASRock BC-250: Building the Budget Steam Machine”

“If you want easy quick setups. Like an interface for a fatbikes, washmachine, dashboard for a car, then go for esp”

RecommendsComment from 21 Jul 2026 in “Arduino Launches Plug-and-Play Modules for Long-Range Sensor Projects”

“They're the perfect alternative to a Raspberry Pi because they have WiFi, Bluetooth, lots of GPIO, and decent compute.”

RecommendsComment from 19 Jul 2026 in “Clever hacker fits 537,000 domains in a $5 ESP32 ad-blocking dongle”

“mate them to an esp32 board which is another couple bucks. It's so much fun as a hobby!”

RecommendsComment from 30 Jun 2026 in “I built a mmWave material classification radar”

“I'd bet for under $10 you could build something with an ESP32 and a battery and solar panel”

RecommendsComment from 9 Jun 2026 in “Company Will Add Phone, AirPod, and Smartwatch Trackers to ALPRs”

“esp32 is way too power budget heavy for anything using batteries though”

CriticizesComment from 3 Jun 2026 in “Roku LT Operating System open source distribution”

“the ESP32 comes with top notch documentation and SDKs that will make beginners at least want to stay with Espressif's modified RTOS for a while”

RecommendsComment from 3 Jun 2026 in “Roku LT Operating System open source distribution”

“you can just use an arduino, esp32, or an actual microcontroller for a fraction of the price and power consumption”

RecommendsComment from 29 May 2026 in “News about Raspberry Pi 6 and Microcontroller Development – Jeff Geerling”

“the ESP32 is offering CPU power on par with many of the embedded-x86 SOCs that powered some of the early wifi routers”

RecommendsComment from 28 May 2026 in “News about Raspberry Pi 6 and Microcontroller Development – Jeff Geerling”

“Almost everything that is unique to a Pi compared to an x86 mini PC seems like it makes more sense with an ESP device.”

RecommendsComment from 28 May 2026 in “News about Raspberry Pi 6 and Microcontroller Development – Jeff Geerling”

“It's not going to be as good on battery power but the barrier to entry for people wanting to tinker is really low.”

MixedComment from 24 Apr 2026 in “A DIY Watch You Can Actually Wear”

“If power usage is the metric you optimize for, there's much better BOM than an esp32.”

CriticizesComment from 24 Apr 2026 in “A DIY Watch You Can Actually Wear”

“an esp32 on an 1100mah battery will last years on deep sleep, and about a day with wifi on and in high power modes.”

MixedComment from 23 Apr 2026 in “A DIY Watch You Can Actually Wear”

“Trying to reduce idle power use of a simple esp32 based project I did a while back”

MixedComment from 21 Apr 2026 in “Framework Laptop 13 Pro”

“The trick is to use the internal ESP32 10MHz hardware which automatically kicks timestamps into a register if a GPIO does something.”

RecommendsComment from 4 Apr 2026 in “Iran's Network of Cameras Bolsters Air Defenses, Expert Says”

“Love ESP boards, and with Raspberry pi pricing though the roof, I'm hoping more will discover the love of getting the job done on a 10mm2 package.”

RecommendsComment from 3 Apr 2026 in “ESP32-S31: 320MHz 2C RV32IMAFCP+CLIC, 512KB SRAM, GbE, 802.11ax, 61 GPIO”

“every single company I've worked which took security seriously (medical implants, critical safety industry) not only banned their use on our designs”

CriticizesComment from 3 Apr 2026 in “ESP32-S31: 320MHz 2C RV32IMAFCP+CLIC, 512KB SRAM, GbE, 802.11ax, 61 GPIO”

“Microcontrollers like esp32 cost about $10 these days, for a machine more capable than an early PC.”

RecommendsComment from 18 Mar 2026 in “Java 26 is here, and with it a solid foundation for the future”

“An ESP32 mesh doesn't have nearly enough capacity to handle all the messages and multimedia flying around”

MixedComment from 12 Mar 2026 in “Show HN: s@: decentralized social networking over static sites”

“Espressif in particular has pushed MCUs up to a new level where it's become viable to run a designed-from-scratch web server”

RecommendsComment from 11 Mar 2026 in “RISC-V Is Sloooow”

“An ESP32 that just proxies to cloud APIs and handles tool orchestration locally is actually a more reliable deployment target than a full OS”

RecommendsComment from 22 Feb 2026 in “zclaw: Personal AI assistant in under 888 KB, running on an ESP32”

“Super cheap from China and you can find them with all sorts of cool form factors with lipo battery chargers, screens, etc.”

RecommendsComment from 9 Jan 2026 in “Embassy: Modern embedded framework, using Rust and async”

“FreeRTOS with hardware flash paging can pose an issue, but at least it already doesn't need Arduino software”

MixedComment from 15 Dec 2025 in “Adafruit: Arduino’s Rules Are ‘Incompatible With Open Source’”

“for low power sensor stuff the ESP32 is far away from being my favorite anyway”

CriticizesComment from 15 Dec 2025 in “Adafruit: Arduino’s Rules Are ‘Incompatible With Open Source’”

“Arduino/Raspberry/ESP32-compatible stuff is cheap and available. Lots of information about it.”

RecommendsComment from 12 Dec 2025 in “Nokia N900 Necromancy”

“Anything that's got wireless/bluetooth integrated is probably backdoored already, but the esp32 certainly has been”

CriticizesComment from 12 Dec 2025 in “UK House of Lords attempting to ban use of VPNs by anyone under 16”

“Yeah, Arduino, Teensy, ESP32… I prefer these options when you don't in fact need an OS.”

RecommendsComment from 5 Dec 2025 in “Show HN: I was reintroduced to computers: Raspberry Pi”

“the best part of the modern embedded chips with few MB of RAM (including ESP32) is that they _don't_ run Linux”

RecommendsComment from 27 Nov 2025 in “ESP32”

“I found that the ESP32 and its whole WiFi stack (?) were slowing the device down.”

CriticizesComment from 21 Nov 2025 in “Arduino published updated terms and conditions: no longer an open commons”

“ESPs are great, but their hobbyist ecosystem ultimately relies on the goodwill of a Chinese company”

MixedComment from 19 Nov 2025 in “The Death of Arduino?”

“Just wait until Espressif gets some greedy shareholders/or some manager that needs a raise”

CriticizesComment from 12 Nov 2025 in “My fan worked fine, so I gave it WiFi”

“esp32 are really nice: hundreds of code examples that do what you want without having to read too many pages”

RecommendsComment from 12 Nov 2025 in “My fan worked fine, so I gave it WiFi”

“ESP32 has inherent sleep issues and before their latest chip (c6 I think) 'deep sleep' was really a gpio- or rtc- triggered boot followed by a power off.”

CriticizesComment from 6 Nov 2025 in “IKEA launches new smart home range with 21 Matter-compatible products”

Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.