Overview
WiFi LoRa 32 is a part of the “Heltec LoRa“ series, with the following features:
| 1 | CE Certificate; |
| 2 | Microprocessor: ESP32 (dual-core 32-bit MCU + ULP core), with LoRa node chip SX1276/SX1278; |
| 3 | Micro USB interface with complete voltage regulator, ESD protection, short circuit protection, RF shielding and other protection measures; |
| 4 | 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); |
| 5 | Integrated WiFi, LoRa, Bluetooth three network connections, on-board Wi-Fi, Bluetooth dedicated 2.4GHz metal 3D antenna, reserved IPEX (U.FL) interface for LoRa use; |
| 6 | On-board 0.96-inch 128*64 dot matrix OLED display, which can be used to display debugging information, battery power and other information; |
| 7 | Integrated CP2102 USB to serial port chip, convenient for program downloading, debugging information printing; |
| 8 | Support the Arduino development environment; |
| 9 | (Exclusive) Supports the Arduino version of the ESP32 + LoRaWAN protocol routine provided by Heltec. This is a standard LoRaWAN protocol that can communicate with any gateway/base station running the LoRaWAN protocol (requires serial number activation, only the development of the company) The board is available) |
| 10 | 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; |
Technical Parameters
| Source | Parameter |
| MCU | ESP32( 240MHz Tensilica LX6 dual-core + 1 ULP, 600 DMIPS, 520KB SRAM, Wi-Fi, dual mode Bluetooth) |
| LoRa chip | SX1276 |
| 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 | 4MB(32M-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 |
Eletrical characteristics
| 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 input current | |||
| External device power control (Vext 3.3V) | 350mA |
Heltec Lora32 Pinout Schema
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