Introducting H32 - Page 1
Forum section: electronics / projects

author: soubitos
author_rank: Frequent Contributor
timestamp: February 17, 2021, 10:14:49 am
content: H32 is an attempt to create an energy efficient ESP32/RFM9x devkit which allows easy installation and testing while developing firmware but, once the project built around it is ready you can simply move to an enclosure or its installation location and have a working project without need to redesign a custom board for it.H32 is built around an ESP32-WROOM-32U and has room for an optional RFM9x module.Onboard you will find an RTC with its own battery & a humidity/temp sensor from sensirion so you can monitor the conditions inside the enclosure.There are two main switches. First one selects power mode between OFF-TIMER & ON states. Set to ON your power efficiency depends on firmware and ESP32's deep sleep. Set to Timer, a nanopower timer (TPL5111) is power cycling the controller with the second switch selecting 30-60min or a custom interval (set by two easy to solder TH/1206 resistors). In timer mode only the LDO & Timer draw current from the power source and in theory would consume about 50nA combined (I think 3-4x that much is going to be more realistic accounting for leackage currents etc.Programming H32 is pretty much standard procedure, there are onboard reset and flash buttons and uart access but i also designed a small CH340N USB/TTL adapter with autoreset to connect on the 6pin header. Removing the usb/ttl circuitry from the devkit means lower power consumption and lower cost as even if you need to install several units, you only need one adapter.H32 has all available connections going through spring loaded terminals making it so much easier to wire sensors, inputs and outputs and you dont need to breadboard the devkit itself to make a functional project setup. You get access to UART, SPI, I2C, 4x GPIO & 4x Analog inputs. Voltage dividers on the analog inputs have a 10k resistor to ground and you can set the dividers by adding TH/1206 resistors.There is an XT30 connector to connect to battery or power source and as is it will perform very well with possibly readily available or low cost and easy to source 12V solar panels/LA battery chargers/7Ah LA batteries. I am already working on 2 or 3 alternative power sources with matching PSU board connecting on top of H32.PCB is 84x72mm and is designed to fit DEGSON PCB carriers or DRG-03 brackets to allow installation on DIN RAIL.I am also working on a backplate to fit 100x100mm IP65 electrical enclosures with onboard battery charger battery holder and protections for single cell 18650 Li-Ion.H32 is the official sensor node board for mudpi projectmudpi.appand will launch a campaign on groupgets.We will make a limited number available as early birds, priced a bit lower than campaign or retail price and make H32 available to peple willing to test and use it while providing feedback and possibly willing to help promote it.

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 17, 2021, 02:45:51 pm
content: To each their own but I would have named it after a reptile due to its ability to "hibernate". Maybe "alligator" for staying still using little energy but then leap in a powerful burst when opportunity strikes?

author: soubitos
author_rank: Frequent Contributor
timestamp: February 18, 2021, 10:49:43 am
content: I was not thinking so aggressive when naming the darn board

author: soubitos
author_rank: Frequent Contributor
timestamp: February 18, 2021, 10:51:30 am
content: This is Sunburst , a matching 1S2A LiPo mppt solar charger for H32

author: soubitos
author_rank: Frequent Contributor
timestamp: March 05, 2021, 11:40:56 am
content: Seems Hummingbird is used by an electronics company in the US and to avoid confusion and collision i had to rename the project to H32, was calling it H32 for short anyway....First PCB have been ordered, should be here in few weeks, components will take a little longer but i am really excited to have the first H32's rolling out.Still available units to pre-order, shall anybody be interested.

author: xamarinbcn
author_rank: Newbie
timestamp: December 23, 2021, 01:04:26 pm
content: Hola cómo puedo comprar esta pcb. Gracias