From idea to deployment in no time, H32 helps make product development a whole easier experience

H32 rev3 Ultra Low Power (3.5uA) ESP32 platform

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Home automation

What is it?

H32 is an Ultra Low Power ESP32 platform. It is designed to make connections to additional electronics (sensors etc) a lot easier using spring terminals and, once your project is past the development stage you may need a custom expansion board with the additional electronics but NOT a whole ESP32 board with power management etc.. these are taken care for by H32. This makes it cheaper and faster to deliver the finished project for deployment.

Why did you make it & what makes it special?

Almost everybody involved with ESP32 has at some point used a "typical" devkit most of which have terrible power management circuitry for a battery powered project you want to develop. Almost everybody who has worked with a "typical devkit during project development hates the myriad of not so easy to work with wires with pin headers which if not of really good quality can cause problems either electrical (cheap wires with huge resistance) or mechanical (getting loose easily after few uses). not to mention one wrong move can remove a bunch of wires and have you start from scratch. Typically you will breadboard a devkit connect sensors etc to it and once you're done you most likely need to design a custom board to host the devkit and additional electronics. Although in theory its possible to bring an ESP32 in a very low power mode, using a normal devkit usually increases the "idle" state power consumption from hundreds of uA to a few mA even. You also cannot power a devkit from a wide voltage range and most of the time they are designed to use with LiPo or protected Li-Ion as they dont have battery protection onboard.

H32 was designed to solve all these problems and more. Instead of trying to achieve low idle power consumption with the ESP and everything else onboard powered H32 shuts down system power completely achieving an ultra low idle power consumption of aprox 3.5uA. The onboard fuel gauge will turn on power if battery goes critically low and so will any sensor you add or any kind of switch like reed switches or floater switches. H32 fits inside 100x100mm waterproof electrical junction boxes (some are bigger inside than others, you need to find a suitable enclosure but many in the market do fit, H32 was designed to fit a specific model we can source from the Greek manufacturer) H32 has a 500mA single cell Li-Ion charger with battery protection as well as an I2C fuel gauge which are responsible for the well being of the onboard 18650 cell. Power source can be anything DC from wall adapters to solar panels with voltages between 5 and 30V. When in off state a solar panel can recharge the battery and if turned on and solar panel delivers enough power there is a power path making sure battery stays charged and system receives power from external source.


H32 operates based on a power management circuit controlled by active low signals. Besides the Power Button & Fuel Gauge which can both turn on power, H32 is using an RTC by EPSON in order to turn on and off on its own based on a time interval which can by dynamically changed based ie on battery status or a sensor reading etc. This means H32 is particularly suited for applications where a physical event is monitored for changes over time or, has a very sporadic and irregular occurrence. A good example is that of a remote water tank where a floater switch triggers H32 when water level is low and H32 can use for example an NB-IoT or LoRa modules to send an alert to the end user that tank needs to be refilled. While waiting for this event, H32 can stay OFF waking up once every few days even in order to verify battery status and send a signals confirming its still active.


All GPIO from Ai-Thinker's ESP32-S (ESP32-WROOM-32) except GPIO13 are available to the user.. GPIO13 is used to shut down power when system is ready.. it is still accessible in order you want to implement a different shut down approach.


We have prepared a prototyping board but are working on application specific expansion boards ie LoRa or NB-IoT or Beekeeping with a load cell interface etc. Main system power and battery power are also available for use.


An AHT21 I2C humidity & temperature sensor is onboard H32 for basic readings..


Firmware for H32 has been developed by Joachim Baumann and you can find it here Current version supports H32 rev2 but firmware for rev3 is in development as we speak and should be ready in the following weeks.


There is a 6pin programming header with access to POWER, RESET, GPIO0 & RX/TX A matching USB adapter is specially designed for H32 (and not only)

H32 will increase your creativity, expand your battery runtime and help you go from idea to finished project faster and easier than any other devkit in the market today.. did we mention its consumes only 3.5uA when idle???

Links to code and documentation

Code (

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Burgduino's store

Patra, Achaia, Greece
12 orders since Oct 18, 2021
Burgduino electronics