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Heltec WiFi LoRa 32 board

Pinout (first release)

Pinout.

LMIC pin mapping

For LMIC use:

// Pin mapping
const lmic_pinmap lmic_pins = {
    .nss = SS, // active-low SPI slave-select; pin 18
    .rxtx = LMIC_UNUSED_PIN, // rx/tx control
    .rst = RST_LoRa, // reset; pin 14
    .dio = {DIO0, DIO1, DIO2} // digital input/output; pins 26, 33, 32
};

Board details

According to the manufacturer:

  • Dominant Frequency: 240MHZ
  • Flash: 32M-Bits
  • Processor: for Tensilica LX6 Dual Core
  • Master chip: ESP32, chip built-in 520 KB SRAM
  • Computing capacity: up to 600DMIPS
  • LoRa chip: SX1276, +20 dBm power output
  • Receiver sensitivity: -139dBm (SF12, 125KHZ)
  • 0.96-inch blue OLED display
  • Dual-mode Bluetooth: traditional Bluetooth and BLE low-power Bluetooth
  • Operating voltage: 3.3 - 7V
  • Operating temperature range: -40 - 90 °C
  • UDP continuous throughput: 135Mbps
  • USB adapter chip: CP2102
  • 802.11 b/g/N HT40 Wi-Fi transceiver
  • Support mode: Sniffer, Station, softAP and Wi-Fi Direct
  • Transmit power: 19.5dBm@11b, 16.5dBm@11g, 15.5dBm@11n
  • Data rate: 150Mbps@11n HT40, 72Mbps@11n HT20, 54Mbps@11g, 11Mbps@11b
  • Lithium battery charging circuit and interface

According to the ESP8266 and ESP32 serial bootloader utility:

$ esptool.py chip_id

Serial port /dev/cu.SLAB_USBtoUART
Detecting chip type... ESP32
Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, Coding Scheme None
Crystal is 26MHz

See also its PlatformIO details.

CP210x drivers

CP210x USB to UART Bridge Virtual COM Port (VCP) drivers are required to facilitate host communication with CP210x products. The drivers can be downloaded from Silicon Labs.