Description
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 homes, and IoT makers.
Overview
- 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.
Tech spec
| Resource | Parameter | ||
| Master Chip | ESP32( 240MHz Tensilica LX6 dual-core + 1 ULP, 600 DMIPS) | ||
| Wireless Communication | Wi-Fi | Bluetooth | LoRa |
| 802.11 b/g/n (802.11n up to 150 Mbps) | Bluetooth V4.2 BR/EDR and Bluetooth LE specification | Node-to-node communication or LoRaWAN | |
| LoRa Chip | SX1276/SX1278 | ||
| LoRaWAN Area | hardware version | Support frequency | |
| LF | EU433 | ||
| CN470 | |||
| HF | IN865 | ||
| EU868 | |||
| US915 | |||
| AU915 | |||
| KR920 | |||
| AS923 | |||
| LoRa Maximum Output Power | 19dB ± 1dB | ||
| Hardware Resource | UART x 3; SPI x 2; I2C x 2; I2S x 1; 12-bits ADC input x 18; 8-bits DAC output x 2; GPIO x 22，GPI x 6 | ||
| FLASH | 8MB(64M-bits) SPI FLASH | ||
| RAM | 520KB internal SRAM | ||
| Interface | Micro USB x 1; LoRa Antenna interface(IPEX) x 1; 18 x 2.54 pin x 2 | ||
| Maximum Size (Including protruding parts such as switch and battery compartment) |
51 x 25.5 x 10.6 mm | ||
| USB to Serial Chip | CP2102 | ||
| Battery | 3.7V Lithium（SH1.25 x 2 socket） | ||
| Solar Energy | x | ||
| Battery Detection Circuit | √ | ||
| External Device Power Control（Vext） | √ | ||
| Low Power | Deep Sleep 800μA | ||
| Display Size | 0.96-inch OLED | ||
| Working Temperature | -40~80℃ | ||
| Electrical Features | Condition | Minimum | Typica | 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 output | 50mA | |||
| LoRa 12dB output | 60mA | |||
| LoRa 15dB output | 110mA | |||
| LoRa 20dB output | 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 |
Docs&resource
- 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://resource.heltec.cn/download/WiFi_LoRa_32/WIFI_LoRa_32_V2.pdf
- WiFi LoRa 32 Schematic Diagram
- https://resource.heltec.cn/download/WiFi_LoRa_32/V2
- WiFi LoRa 32 Hardware Update Logs
- https://heltec-automation-docs.readthedocs.io/en/latest/esp32/wifi_lora_32/hardware_update_log.html
- Heltec LoRa Node Products Difference Table (Product Selection Table)
- https://docs.heltec.cn/#/en/products/lora/lora_node/heltec_lora_node_list_eu
- Frequently Asked Questions
- https://heltec-automation-docs.readthedocs.io/en/latest/esp32/frequently_asked_questions.html
- AutoCAD & 3D Drawing
- AutoCAD 2017 version drawing: https://resource.heltec.cn/download/WiFi_LoRa_32/lora32%26kit32.dwg
- Solid Works 2014 Version 3D drawing: https://resource.heltec.cn/download/WiFi_LoRa_32/lora32%26kit32.stl
- 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
- 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:
- YouKu:click to play
- YouTube:click to play
Test Info
LoRa 470MHz RF Power Output
868MHz and 915MHz SWR Test Data
470MHz Smith Chart
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