Development Board SX1278 ESP32 Chip OLED WIFI LoRa Node 433-470MHz Upgrade Version

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Heltec LoRa Node Products Difference Table:

“Heltec LoRa” product family already included follow options:

LoRa spread spectrum communication (node);

Battery powered;

Good RF circuit design and impedance matching.

Product	Type??/span>	MCU	FLASH	Battery	Battery Detect	Vext??/span>	Low Power??/span>	Display
WiFi LoRa 32	Dev-Board	ESP32	4MB	Lithium??/span>	x	x	x	OLED (128x64)
WiFi LoRa 32(V2) (This item)	Dev-Board	ESP32	8MB	Lithium??/span>	√	√	800uA	OLED (128x64)
Wireless Stick (Product ID: 1639290)	Dev-Board	ESP32	8MB	Lithium??/span>	√	√	800uA	OLED (64x32)
Wireless Stick Lite (Product ID: 1638098)	Dev-Board	ESP32-PICO	4MB	Lithium??/span>	√	√	35uA	x
Wireless Shell (Product ID: 1638101)	Module	ESP32-PICO	4MB	–	√	x	10uA	x
LoRa Kit 151 (Product ID: 1639289)	Dev-Board	STM32L151CBU6	128kB	Lithium	x	x	7uA	x
LoRa Node 151 (Product ID: 1638100)	Dev-Board	STM32L151CCU6	256kB	1/2 AA Lithium chlorine sulfite battery	√	√	1.8uA	x
Turtle Board (Product ID: 1638099)	Dev-Board	STM32L432KC	256kB	AAA x 2	√	√	5uA	x

Notes:

??– Type:

Dev-Board – Can be used directly;

Module – Only core function, need to cooperate with external PCB or circuit.

??– Lithium: All lithium battery socket for Heltec boards is SH1.25-2;

??– Vext: 3.3V(500mA) output, for external devices (e.g. sensors) power supply, in deep sleep mode, Vext can be shut down via software;

??– Low Power: Products’ low power design, of Whole Circuit, the measured data are the current of the system during deep sleep.

Feature:

-WiFi LoRa 32 is a classic IoT dev-board designed & produced by Heltec Automation(TM), it’s a highly integrated product based on ESP32 + SX127x, it has Wi-Fi, BLE, LoRa functions, also Li-Po battery management system, 0.96″ OLED are also included. It’s the best choice for smart cities, smart farms, smart home, and IoT makers.

-CE Certificate;

-Microprocessor: ESP32 (dual-core 32-bit MCU + ULP core), with LoRa node chip SX1276/SX1278;

-Micro USB interface with a complete voltage regulator, ESD protection, short circuit protection, RF shielding, and other protection measures;

-Onboard SH1.25-2 battery interface, integrated lithium battery management system (charge and discharge management, overcharge protection, battery power detection, USB / battery power automatic switching);

-Integrated WiFi, LoRa, Bluetooth three network connections, onboard Wi-Fi, Bluetooth dedicated 2.4GHz metal 3D antenna, reserved IPEX (U.FL) interface for LoRa use;

-Onboard 0.96-inch 128*64 dot matrix OLED display, which can be used to display debugging information, battery power, and other information;

-Integrated CP2102 USB to serial port chip, convenient for program downloading, debugging information printing;

-Support the Arduino development environment;

-We provide ESP32 + LoRaWAN protocol Arduino® library, this is a standard LoRaWAN protocol that can communicate with any LoRa gateway running the LoRaWAN protocol. In order to make this code running, a unique license is needed. it can be found on this page;

-With good RF circuit design and basic low-power design (sleep current ≤800uA), it is convenient for IoT application vendors to quickly verify solutions and deploy applications.

Source	Parameter
MCU	ESP32( 240MHz Tensilica LX6 dual-core + 1 ULP, 600 DMIPS, 520KB SRAM, Wi-Fi, dual mode Bluetooth)
LoRa chip	SX1276 (868 and 915 version); SX1278 (433 and 470 version)
LoRa bands	EU_433, CN_470_510, EU_863_870, US_902_928 four bands optional
LoRa maximum output power	18dB ± 2dB
Hardware resources	UART x 3; SPI x 2; I2C x 2; I2S x 1
	12 – bits ADC; 8 – bits DAC
	29 general GPIO
Display	0.96 inch 128*64 OLED display
FLASH	8MB(64M-bits) SPI FLASH
interface	Micro USB x 1; LoRa antenna interface(IPEX) x 1
Size	50.2 x 25.5 x 9.74 mm
USB to UART Bridge	CP2102
Battery Type	3.7V Lithium(SH1.25 x 2)
Battery detection circuit	√
External device power control(Vext)	√
Low power design	Deep Sleep 800uA

Electrical characteristics	Condition	Minimum	Typical	Maximum
Power Supply	USB powered(≥500mA)	4.7V	5V	6V
	Lithium powered(≥250mA)	3.3V	3.7V	4.2V
	3.3V(pin)powered(≥150mA)	2.7V	3.3V	3.5V
	5V(pin)powered(≥500mA)	4.7V	5V	6V
Power consumption(mA)	WIFI scan		115mA
	WIFI AP		135mA
	LoRa 10dB emission		50mA
	LoRa 12dB emission		60mA
	LoRa 15dB emission		110mA
	LoRa 20dB emission		130mA
Output	3.3V pin output			500mA
	5V pin output (USB powered only)		Equal to the input current
	External device power control (Vext 3.3V)			350mA

Package includes:

1 x Development Board

How to install Heltec ESP32 Arduino Development Environment:

http://www.heltec.cn/wifi_kit_install/

Heltec ESP32 Series Source code:

Heltec ESP(ESP32 & ESP8266) framework (the basic of Heltec ESP series products Arduino running environment): https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series

Heltec ESP32 library (must work with Heltec ESP framework): https://github.com/HelTecAutomation/Heltec_ESP32

Heltec ESP32 LoRaWAN library (a standard LoRaWAN protocol library provide by Heltec Automation, need a license to active: http://www.heltec.cn/search/): https://github.com/HelTecAutomation/ESP32_LoRaWAN

Adafruit CircuitPython TinyLora library (Alan Peaty ported and shared this library): https://github.com/fantasticdonkey/uLoRa

WiFi LoRa 32 Pin out Diagram:

https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series/blob/master/PinoutDiagram/WIFI_LoRa_32_V2.pdf

WiFi LoRa 32 Schematic Diagram:

https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series/tree/master/SchematicDiagram/WiFi_LoRa_32(V2)

The upgrade of WiFi LoRa 32(V2) relative to V1:

https://docs.heltec.cn/#/en/user_manual/the_upgrade_of_wifi_lora_32_v2_compare_with_v1

Summary of Common Problems:

https://docs.heltec.cn/#/en/faq/heltec_esp_series_common_problem_summary

AutoCAD & 3D Drawing:

AutoCAD 2017 version drawing: https://docs.heltec.cn/download/WiFi_Kit.dwg

Solid Works 2014 Version 3D drawing: https://docs.heltec.cn/download/WiFi_Kit.zip

Interesting applications made by WiFi LoRa 32:

Paxcounter: https://github.com/cyberman54/ESP32-Paxcounter

A low-cost LoRa ioT solution: https://github.com/CongducPham/LowCostLoRaGw

As a model remote control: http://www.moz8.com/thread-172414-1-1.html?_dsign=4feb6948

Used to prevent hay and straw fires: https://www.ibm.com/developerworks/cn/iot/library/iot-lpwan-lora-nodemcu-dhtsensors/

WiFi instant camera: https://hackaday.io/project/162256-esp32-8266-wifi-instant-camera

morserino (Morse code with a multi-functional morserino device) : http://www.morserino.info/morserino-32.html

MicroPython example (IoT examples with many sensors and detail docs):

https://www.rosietheredrobot.com/2019/04/lora-wan-kenobi.html

https://www.rosietheredrobot.com/2020/02/battle-of-bletain.html

LoRa sensor node config & usage video: https://youtu.be/YJwjZOkhdD8 https://youtu.be/8-bIp66ON1I

Single-channel LoRa gateway solution: https://github.com/things4u/ESP-1ch-Gateway-v5.0

User test info report:

General test report: https://robotzero.one/heltec-wifi-lora-32/

Communication distance test:

YouTube: click to play