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 |
Type① |
MCU |
FLASH |
Battery |
Battery Detect |
Vext③ |
Low Power④ |
Display |
| WiFi LoRa 32 |
Dev-Board |
ESP32 |
4MB |
Lithium② |
x |
x |
x |
OLED (128×64) |
WiFi LoRa 32(V2)
(This item) |
Dev-Board |
ESP32 |
8MB |
Lithium② |
√ |
√ |
800uA |
OLED (128×64) |
|
Dev-Board |
ESP32 |
8MB |
Lithium② |
√ |
√ |
800uA |
OLED (64×32) |
|
Dev-Board |
ESP32-PICO |
4MB |
Lithium② |
√ |
√ |
35uA |
x |
|
Module |
ESP32-PICO |
4MB |
– |
√ |
x |
10uA |
x |
|
Dev-Board |
STM32L151CBU6 |
128kB |
Lithium |
x |
x |
7uA |
x |
|
Dev-Board |
STM32L151CCU6 |
256kB |
1/2 AA Lithium chlorine sulfite battery |
√ |
√ |
1.8uA |
x |
|
Dev-Board |
STM32L432KC |
256kB |
AAA x 2 |
√ |
√ |
5uA |
x |
Notes:
① – Type:
Dev-Board – Can be used directly;
Module – Only core function, need to cooperate with external PCB or circuit.
② – Lithium: All lithium battery socket for Heltec boards is SH1.25-2;
③ – Vext: 3.3V(500mA) output, for external devices (e.g. sensors) power supply, in deep sleep mode, Vext can be shut down via software;
④ – 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:
Heltec ESP32 Series Source code:
Heltec ESP(ESP32 & ESP8266) framework (the basic of Heltec ESP series products Arduino running environment):
Heltec ESP32 library (must work with Heltec ESP framework):
Heltec ESP32 LoRaWAN library (a standard LoRaWAN protocol library provide by Heltec Automation, need a license to active: http://www.heltec.cn/search/):
Adafruit CircuitPython TinyLora library (Alan Peaty ported and shared this library):
WiFi LoRa 32 Pin out Diagram:
WiFi LoRa 32 Schematic Diagram:
The upgrade of WiFi LoRa 32(V2) relative to V1:
Summary of Common Problems:
AutoCAD & 3D Drawing:
AutoCAD 2017 version drawing:
Solid Works 2014 Version 3D drawing:
Interesting applications made by WiFi LoRa 32:
Paxcounter:
A low-cost LoRa ioT solution:
As a model remote control:
Used to prevent hay and straw fires:
WiFi instant camera:
morserino (Morse code with a multi-functional morserino device) :
MicroPython example (IoT examples with many sensors and detail docs):
LoRa sensor node config & usage video:
Single-channel LoRa gateway solution:
User test info report:
General test report:
Communication distance test:
YouTube:
Availability: 
Shipping: Free Airmail 
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