ESP32
Hacker ApprovedThe 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%
Recommended in 12 of 13 months
- November 2025: recommended
- December 2025: recommended
- January 2026: recommended
- February 2026: recommended
- March 2026: recommended
- April 2026: recommended
- May 2026: recommended
- June 2026: recommended
- July 2026: recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: recommended
- 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"” - Comment from 29 May 2026 in “News about Raspberry Pi 6 and Microcontroller Development – Jeff Geerling”
- Comment from 2 Oct 2026 in “Various Projects Find Hidden SDR Capabilities in ESP32 Microcontrollers”
- Comment from 18 Mar 2026 in “Java 26 is here, and with it a solid foundation for the future”
- Comment from 12 Dec 2025 in “Nokia N900 Necromancy”
- Comment from 20 Oct 2026 in “DeepInfer: High-performance inference framework for DeepSeek models”
- Comment from 28 Oct 2026 in “Raspberry Pi Zero 3W and Pi 4 Model A spotted in device trees”
- Comment from 9 Jun 2026 in “Company Will Add Phone, AirPod, and Smartwatch Trackers to ALPRs”
- Comment from 26 Oct 2026 in “SIMD-accelerated computer vision on a $2 microcontroller”
- Comment from 30 Jun 2026 in “I built a mmWave material classification radar”
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” - Comment from 29 May 2026 in “News about Raspberry Pi 6 and Microcontroller Development – Jeff Geerling”
- Comment from 27 Nov 2025 in “ESP32”
- Comment from 28 Oct 2026 in “Raspberry Pi Zero 3W and Pi 4 Model A spotted in device trees”
- Comment from 5 Dec 2025 in “Show HN: I was reintroduced to computers: Raspberry Pi”
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” - Comment from 18 Mar 2026 in “Java 26 is here, and with it a solid foundation for the future”
- Comment from 26 Oct 2026 in “SIMD-accelerated computer vision on a $2 microcontroller”
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” - Comment from 12 Dec 2025 in “Nokia N900 Necromancy”
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” - Comment from 24 Apr 2026 in “A DIY Watch You Can Actually Wear”
- Comment from 21 Apr 2026 in “Framework Laptop 13 Pro”
- Comment from 15 Dec 2025 in “Adafruit: Arduino’s Rules Are ‘Incompatible With Open Source’”
- Comment from 3 Jun 2026 in “Roku LT Operating System open source distribution”
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?” - Comment from 12 Nov 2025 in “My fan worked fine, so I gave it WiFi”
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.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| ESP32 | 190 | 35 | 84% | 12 | 5 yrs3 owners | Approved |
| Arduino boards | 81 | 73 | 53% | 12 | 16 yrs7 owners | — |
| Raspberry Pi Pico | 72 | 16 | 82% | 12 | — | Approved |
| Raspberry Pi RP2350 | 47 | 13 | 78% | 11 | — | Approved |
| Raspberry Pi RP2040 | 29 | 5 | 85% | 10 | — | Approved |
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”
“they present something near-ish to the Pentium era of personal computing for a few dollars”
“the success of things like ESP32 shows that good price + good enough is a powerful combination”
“the ESP32 is fairly limited in a lot of ways due to the limited processing power and IO bandwidth”
“Among the cheapest and most easily available ways to get Wi-Fi or BT into your microcontroller project.”
“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”
“only those are guaranteed to have a lot of software support, documentation, easy availability on aliexpress etc. for cheap”
“I've also seen people use an ESP32 to power on the system with a bluetooth controller which is pretty neat”
“If you want easy quick setups. Like an interface for a fatbikes, washmachine, dashboard for a car, then go for esp”
“They're the perfect alternative to a Raspberry Pi because they have WiFi, Bluetooth, lots of GPIO, and decent compute.”
“mate them to an esp32 board which is another couple bucks. It's so much fun as a hobby!”
“I'd bet for under $10 you could build something with an ESP32 and a battery and solar panel”
“esp32 is way too power budget heavy for anything using batteries though”
“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”
“you can just use an arduino, esp32, or an actual microcontroller for a fraction of the price and power consumption”
“the ESP32 is offering CPU power on par with many of the embedded-x86 SOCs that powered some of the early wifi routers”
“Almost everything that is unique to a Pi compared to an x86 mini PC seems like it makes more sense with an ESP device.”
“It's not going to be as good on battery power but the barrier to entry for people wanting to tinker is really low.”
“If power usage is the metric you optimize for, there's much better BOM than an esp32.”
“an esp32 on an 1100mah battery will last years on deep sleep, and about a day with wifi on and in high power modes.”
“Trying to reduce idle power use of a simple esp32 based project I did a while back”
“The trick is to use the internal ESP32 10MHz hardware which automatically kicks timestamps into a register if a GPIO does something.”
“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.”
“every single company I've worked which took security seriously (medical implants, critical safety industry) not only banned their use on our designs”
“Microcontrollers like esp32 cost about $10 these days, for a machine more capable than an early PC.”
“An ESP32 mesh doesn't have nearly enough capacity to handle all the messages and multimedia flying around”
“Espressif in particular has pushed MCUs up to a new level where it's become viable to run a designed-from-scratch web server”
“An ESP32 that just proxies to cloud APIs and handles tool orchestration locally is actually a more reliable deployment target than a full OS”
“Super cheap from China and you can find them with all sorts of cool form factors with lipo battery chargers, screens, etc.”
“FreeRTOS with hardware flash paging can pose an issue, but at least it already doesn't need Arduino software”
“for low power sensor stuff the ESP32 is far away from being my favorite anyway”
“Arduino/Raspberry/ESP32-compatible stuff is cheap and available. Lots of information about it.”
“Anything that's got wireless/bluetooth integrated is probably backdoored already, but the esp32 certainly has been”
“Yeah, Arduino, Teensy, ESP32… I prefer these options when you don't in fact need an OS.”
“the best part of the modern embedded chips with few MB of RAM (including ESP32) is that they _don't_ run Linux”
“I found that the ESP32 and its whole WiFi stack (?) were slowing the device down.”
“ESPs are great, but their hobbyist ecosystem ultimately relies on the goodwill of a Chinese company”
“Just wait until Espressif gets some greedy shareholders/or some manager that needs a raise”
“esp32 are really nice: hundreds of code examples that do what you want without having to read too many pages”
“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.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.