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Heltec Development Board SX1262 ESP32 Chip OLED WiFi LoRa Node V2 for Arduinos
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Heltec LoRa Node Products Difference Table:
u201cHeltec LoRainchs 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 Poweru2463 | Display |
| WiFi LoRa 32 | Dev-Board | ESP32 | 4MB | Lithium② | x | x | x | OLED (128x64) |
| WiFi LoRa 32(V2) | Dev-Board | ESP32 | 8MB | Lithium② | u221a | u221a | 800uA | OLED (128x64) |
| (This item) | ||||||||
| Wireless Stick | Dev-Board | ESP32 | 8MB | Lithium② | u221a | u221a | 800uA | OLED (64x32) |
| Wireless Stick Lite | Dev-Board | ESP32-PICO | 4MB | Lithium② | u221a | u221a | 35uA | x |
| Wireless Shell | Module | ESP32-PICO | 4MB | – | u221a | x | 10uA | x |
| LoRa Kit 151 | Dev-Board | STM32L151CBU6 | 128kB | Lithium | x | x | 7uA | x |
| LoRa Node 151 | Dev-Board | STM32L151CCU6 | 256kB | 1/2 AA Lithium chlorine sulfite battery | u221a | u221a | 1.8uA | x |
| Turtle Board | Dev-Board | STM32L432KC | 256kB | AAA x 2 | u221a | u221a | 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;
u2463 – 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, 0.96u2033 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 ARDUIN0 development environment;
-We provide ESP32 + LoRaWAN protocol ARDUIN0 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 solution 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 | u221a | |
| External device power control(Vext) | u221a | |
| Low power design | Deep Sleep 800uA | |
| Electrical characteristics | Condition | Min. | Typical | Max. |
| 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 |
1 x Development Board
