Heltec ESP32 LoRa 32 V4 Board with OLED

A development board from Heltec based on a ESP32-S3 microcontroller by Espressif. Thanks to the built-in USB connector, it is easy to program. Things can be shown on the built-in OLED display. For extra connectivity, the board has multiple wireless communication interfaces (including Wi-Fi/Bluetooth/LoRa). Finally, the board has a battery connector where a Li-Po/Li-ion battery (not included) can be connected, which can also be charged via the board.

Compared to the V3, this version features upgrades like solar charging and increased storage capacity.

Note: Not all countries allow LoRa signals to be transmitted on 868MHz with a power of 28dBm (630mW, maximum of this module). In the Netherlands, for example, this maximum is 20dBm (100mW) around 868MHz (with the exception of between 869.40 - 869.65MHz, which may be a maximum of 27dBm (500mW)). Therefore, set the maximum transmission power in such a way that it complies with local laws and regulations.

See the following page for more information: Wiki

See the following page for more information: Manufacturer page

Specifications

General

- Brand: Heltec

- Model: HTIT-WB32LAF

- Revision: V4.3

- Operating temperature: -20°C to 70°C

- Features: Display, Battery charger, Microcontroller (MCU), Programmable button(s)

Physical Specifications

- Color: Black

- Weight: 11 g

- Dimensions: 52 mm × 25 mm

- Form factor: Module

Electrical Specifications

- Supply voltage: 4.7V – 6V

- IO voltage: 3.3V

- Max source current (IO): 40 mA

- Max sink current (IO): 28 mA

Microcontroller (MCU)

- Manufacturer: Espressif

- Chip: ESP32-S3

- Clock speed: 240 MHz

- Cores: 2

Memory

- SRAM: 512 KB

- PSRAM: 2 MB

- Flash: 16 MB

- EEPROM: Emulated

Communication Interfaces

- Interfaces: ADC, I2C, I2S, PWM, SPI, GPIO, UART, USB CDC, Native USB

- GPIO pins: 0–7, 15–21, 26, 33–48

- Total IO pins: 32

- PWM channels: 20

- ADC channels: 13

- DAC channels: 0

- UART: 3

- I2C: 2

- SPI: 2

- USB-to-serial: Integrated

Wireless Connectivity

- Interfaces: LoRa, Wi-Fi, Bluetooth

- Wi-Fi: ESP32-S3, 2.4 GHz

- Bluetooth: Version 5.0 (LE)

- LoRa: SX1262, 868 MHz

Display

- Type: OLED

- Driver: SSD1315

- Size: 0.96 inch

- Resolution: 128 × 64

- Shape: Rectangular

- Color: Blue

Battery & Charging

- Charger IC: CN3165

- Battery type: Li-Po, Li-ion

- Max charging voltage: 4.2V

- Max charging current: 540 mA

- Adjustable current: No

- Protection circuit: No

Connectors

- Power: USB-C (female), 2.54 mm pins

- IO: USB-C, Molex Picoblade (male), 2.54 mm pins

- Battery: Molex Picoblade (male)

- Solar: Molex Picoblade (male)

- Wi-Fi/Bluetooth antenna: Built-in, optional uFL (modification required)

- LoRa antenna: uFL (IPEX MHF1)

Package Contents

- 1× Wi-Fi LoRa 32 V4 board

- 2× 18-pin male headers

- 2× 2-pin male headers

- 1× IPEX LoRa antenna

- 2× Molex Picoblade compatible cables