ESP32 Board - WiFi LoRa 32

Description

Due to lack of documentation about this board i try to collect some infos about it.

Getting the OLED work is a bit tricky, especially for beginners i think. The BoobieTrap here is that you have set Pin16 (OLED_RST) to High or you will see nothing on your display.
Took me a few hours to trick this out :)

just add following lines to your setup loop

pinMode(16,OUTPUT);
digitalWrite(16, LOW); // set GPIO16 low to reset OLED
delay(50);
digitalWrite(16, HIGH); // while OLED is running, must set GPIO16 to high

and, if needed, edit your Wire.begin() to Wire.begin(4,15); (4 = SDA 15 SCL)

i tested it with the Adafruit SSD1306 and the Acrobotics SSD1306 Librarys
both work.

Display size is 128x64

Files

ESP+kit+Specification.pdf

Looks like an Original Chinese dokumentation from HelTec Automation. Found somewhere in the web

Adobe Portable Document Format - 442.80 kB - 08/31/2017 at 08:39

Preview

esp32_hardware_design_guidelines_en.pdf

Usefull for developing own PCB's

Adobe Portable Document Format - 5.16 MB - 08/31/2017 at 08:06

Preview

esp32_datasheet_en.pdf

Esspressif Datasheet (EN)

Adobe Portable Document Format - 849.58 kB - 08/31/2017 at 07:55

Preview

Heltec_WIFI-LoRa-32_DiagramPinout.jpg

Pinout from the Board (found in the description of the auction i bought the board)

JPEG Image - 184.17 kB - 08/31/2017 at 07:55

Preview

ESP32-DrawLogo.ino

Hello World OLED on HelTec ESP32 Board

ino - 6.37 kB - 08/27/2017 at 13:08

Download

Project Logs

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Zip Content on Github
supamoe25 • 09/02/2017 at 07:59 • 1 comment

Zip File should be up on github. Also i found the original link from the auction. Can be found in the comments ;)

I played around with Adafruit SSD1306 / U8gLib. Both work on the board. but some need a bit tweaking (pin16 high etc.)
some kind of software found
supamoe25 • 08/27/2017 at 16:55 • 2 comments

As the Link in the original Dokumentation that i found was not longer available i searched through a few ebay and amazon offers.
Finaly i found something in an ebay auction from DIYmall. The link contains a ~400MB Zip file with the SDK toolchain and some examples more then in the std esp32-arduino package.
Here i found a oled example where the think with the Pin16 pullup was added compared to the std esp32 libs.
i will not add this zip file here or on github cause it seems like there is some copyright violation ( i'm sure it is xD ) triggered here.
But i will upload some off the examples after i took a look at them

View all 2 project logs

Discussions

atboimb wrote 09/09/2018 at 22:02

Hi,

Just tryin to make a temp sensor with this board but I can't get any mesures from DHT22 :/ Always getting nan or timeouts depending on the lib I use ... Did you managed to get this kind of sensor work ? Am I missing something ? Tried to connect to pins 34 -> 39 with no success. Any help would be much appreciated.

Thx.

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supamoe25 wrote 12/04/2018 at 14:46

Hi,

got an DHT22 and an BME280 runnin for around 4month. Worked like a charm, with esp8266 and the Helltec Esp32 board.

Which libs did u use? And it's recommend to use a Resistor (4.7k or up) between VCC and DATA Pin on the DHT22. Some circuits in the web didn't use it and i remember this could cause failures.

Wiring like this should work

https://www.elec-cafe.com/wp-content/uploads/2015/10/ESP8266-Temperature-Humidity-Webserver-with-a-DHT11-sensor_Elec-Cafe.png

edit: maybe try this Lib: https://github.com/beegee-tokyo/DHTesp

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0x16 wrote 06/18/2018 at 07:16

Can You create device similar gotenna or sunnet ? but with screen 4 buttons and good antena?

simple send message, mesh network

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Alex Ramos wrote 04/01/2018 at 12:53

Hello my Lora ESP32 Is stuck flashing the orange LED after uploading any example code. Terminal says Hard Reset, but nothing happens.

Tkz

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Msciegienny wrote 02/27/2018 at 16:58

anyone have working board with OLED and DHT31 sensor (via i2c)? I can run only OLED or DHT31 - not work together...

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Sam Lauzon wrote 01/31/2018 at 01:45

Hi Res Pinout (From manufacturer, in English.)
http://www.heltec.cn/download/WIFI_LoRa_32_Diagram.pdf

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david.agner wrote 12/23/2017 at 08:49

Found some more pins attached to the SX1276. Not verified yet but had a lot of issues when I used those pins for an other spi module.

/*
SX1276 (pin) – ESP32 (pin)
DIO0 (8) – GPIO26 (15)
DIO1 (9) – GPIO33 (13)
DIO2 (10) – GPIO32 (12)
*/

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lbernstone wrote 12/07/2017 at 20:06

Has anyone found a remote control button(s) that will work with the SX1278 in these devices?

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Anton Baykouchev wrote 12/07/2017 at 13:19

I was playing with this module as well and for me Sandeep Mistry LoRa library examples with callbacks (based on interrupt) was not working. OnReceive(...) was never called.

The reasone for this was that I had to define the DIO pin for the 1278 interrupt as INPUT.

pinMode(26, INPUT);

Afterwards all the LoRa sketches was working pretty fine.

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Guy 'DeuxVis' P. wrote 11/08/2017 at 20:51

Are you sure? yes | no

Jeffeb3 wrote 11/05/2017 at 17:47

This is just what I needed, Thank you!

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jseward wrote 11/04/2017 at 23:55

What type of battery connector does this board have?

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Guy 'DeuxVis' P. wrote 11/08/2017 at 13:24

I've read it is "micro jst 1.25 mm pitch 2 pins" like this one, but I haven't verified yet : https://www.ebay.com/itm/182462448865

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Guy 'DeuxVis' P. wrote 11/03/2017 at 13:07

If anyone want a 433Mhz version of the lora wiki kit 32, I ordered one by error and am willing to send it to anyone who can have an use for it, at the cost of shipping from France. Drop me a PM.

The dumbest being, I will probably end up sendingit back to Asia here as it seems to be the only region where 433 Mhz is a free frequency...

Seller link for reference : https://fr.aliexpress.com/item/SX1278-LoRa-ESP32-0-96-inch-Blue-OLED-Display-Bluetooth-WIFI-Lora-Kit-32-Module-Internet/32831131677.html?isOrigTitle=true

Edit : no longer available, it went to someone in Germany.

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reg.swensen wrote 10/24/2017 at 08:43

Tnx to xgarb. Excellent info

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Stefan Le Breton wrote 10/24/2017 at 05:55

Hi,

I asked my friendly aliexpress seller ( Bulemon Store) for information and I got this:

https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series

(Joined just after asking..)

This seems to be from heltec as there are a few commits since joining..

Stefan

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Guy 'DeuxVis' P. wrote 10/13/2017 at 15:28

From esp32.net hardware page I found what looks like - a 16 Mbytes flash clone of that on https://www.aliexpress.com/store/product/TTGO-loraSX1278-ESP32-0-96OLED-16-Mt-bytes-128-Mt-bit-433Mhz-for-arduino/2090076_32824758955.html

They provide - as of now - a working link to the big zip file too.

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Guy 'DeuxVis' P. wrote 10/17/2017 at 13:56

By the way those boards are now listed in espressif arduino-esp32 extension - see https://github.com/espressif/arduino-esp32/pull/584

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Mark Brady Ingle wrote 09/15/2017 at 02:43

Does anyone have a working pair of these boards. The code is running on my boards but no packets are showing received. I have println statements in the loop so I know the code is executing. Im testing the LoRa Send and Receive Arduino code

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supamoe25 wrote 09/15/2017 at 07:51

not right now. still in delivery. suppose 2-3 weeks to arrive, but i'm anyway kinda busy atm.

didn't test the LoRa stuff much but it seemed mine collected some packages that time i tried.

Are you sure? yes | no

reg.swensen wrote 10/10/2017 at 09:52

I'm looking for the same thing. I just ordered two boards so I'm going on faith that someone will figure out how to get these things running before long. Have you found any clear docs describing how the 1278 chip on the board is interfaced to the pins of the ESP32? If those don't match the settings in the driver library I can guess no data will be seen despite the code seeming to execute. on at least one of the ebay auctions I saw a photo of what appeared to be a graphical version of the LoRa Send and Receive with display on the built-in SSD1306. It appeared to be displaying a count of successfully sent and received packets but I can't find the sketch that was used to make that photo anywhere. Too bad... it would probably answer all our questions.

Are you sure? yes | no

xgarb wrote 10/16/2017 at 16:14

Lora send and receive can be done with the Sandeep Mistry LoRa library available in the Arduino IDE library manager. You have to make a few changes to the examples:

Define some pins:
#define SS 18
#define RST 14
#define DI0 26

Add a couple of lines to the setup():
SPI.begin(5, 19, 27, 18);
LoRa.setPins(SS, RST, DI0);

and change the baud rate:
Serial.begin(115200);

and LoRa frequency:
LoRa.begin(433E6)

You can cut and paste the whole Sketch from here: https://robotzero.one/heltec-wifi-lora-32/ I've also got a basic output onto the OLED working on the link above.

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patrick wrote 09/08/2017 at 06:37

Hello,

Did not found where to plug the power in (I'd prefer not to use USB)

Anyone has an idea?

Thanks in advance

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supamoe25 wrote 09/08/2017 at 07:27

Mine got a plug for battery at the bottom, maybe there or one of the 5V pins? haven't tried that yet.

The battery plug is maybe only 3.7/4.2V tollerant as it seems that it got a Charging Unit build in, if i can trust the descriptions i found

Are you sure? yes | no

patrick wrote 09/08/2017 at 07:32

Yes, mine too have a plug for a battery. I have connected one 3.7V lithium.

When this battery is connected, the +3.3V and +5V on the board are on. So I guess I can not use them to inject power (to charge the battery). Did not found other pins labelled "Vin"...

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supamoe25 wrote 09/08/2017 at 11:20

maybe the 5V pins can be used as input. think i try it tonight powering it over the pins.

With NodeMCU's(esp8266) or the BluePill Boards(STM32) it is possible, also with a RPi. But powering over the pins means bypassing "overvoltage" safetys AFAIK

EDIT:::

So i succesfull powerd the board over 5V/GND Pin. it's taking round about 86mA with Radios Off. i added a pic to the project

Are you sure? yes | no

Tom wrote 09/02/2017 at 04:38

I have the non-LoRa versons of this Heltec board. I've been looking for examples that make use of the display. Some of the ads show a WiFi app but mine were not pre-flashed and haven't found a download. Let me know if you find anything interesting in your zip.

Are you sure? yes | no

supamoe25 wrote 09/02/2017 at 07:36

Hey Tom,

i just uploading the Zip file with the examples to the GitHub repo right now. So it should be there in a few minutes.

btw i found the link to the Zip File

http://www.diymalls.com/files/FZ2835-FZ2836-FZ2837-ESP32-ESP8266.zip

user/pw: diymall

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xgarb wrote 09/27/2017 at 15:22

On my blog I have the non-Lora version working with the U8g2 display library. If you want to set up the ESP32 with the Arduino IDE I covered that as well... https://robotzero.one/heltec-wifi-kit-32/ Video hopefully coming this weekend.

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ESP32 Board - WiFi LoRa 32

Description

Files

ESP+kit+Specification.pdf

esp32_hardware_design_guidelines_en.pdf

esp32_datasheet_en.pdf

Heltec_WIFI-LoRa-32_DiagramPinout.jpg

ESP32-DrawLogo.ino

Project Logs

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Zip Content on Github

some kind of software found

Discussions

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ESP32 Board - WiFi LoRa 32

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Description

Files

ESP+kit+Specification.pdf

esp32_hardware_design_guidelines_en.pdf

esp32_datasheet_en.pdf

Heltec_WIFI-LoRa-32_DiagramPinout.jpg

ESP32-DrawLogo.ino

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Zip Content on Github

some kind of software found

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900 MHz radio

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