Big ESP32 + SX127x topic part 3

End Devices (Nodes)
98

There appears to be a new Heltec ESP32 LoRa board:

Heltec Wireless Stick

heltec%20wireless%20stick

New features (based on below specs / source):

  • Apparently 800uA power consumption in sleep mode.
    (Disclaimer: this is my interpretation, formatting on page linked below is not clear about this.)
    A major improvement (while still 20+ times more than deep sleep current of ESP32)
  • 16 MB flash.
  • 0.49" OLED display. Yes that’s tiny!
    This will probably have 64x32 resolution.
  • New Wifi Antenna design (similar to TTGO Wifi LoRa32)
    (Finally an ESP32 LoRa board with a more properly placed Wifi antenna on top.)
  • ESP32, LoRa chip and display appear to be shielded with a metal cover (with cutout for display screen).

Source: https://www.aliexpress.com/item/Mini-ESP32-Wifi-Lora-Development-Board-with-0-49inch-oled-display-LoraBar/32960464571.html

Processor

Adopt Lexin’s ESP32 chip

  • 32-bit dual-core, 240MHz frequency
  • Integrated WiFi and Bluetooth
  • The main processor is completely free to run the user application.
  • An additional ULP coprocessor that monitors GPIOs, ADC channels,
    and controls most of the internal peripherals.

LoRa

Using Semtech’s SX1276 chip

  • Supports 433MHz, 470MHz, 868MHz, 915MHz quad-band optional
    Can be used as both a LoRa node and a micro gateway
  • Support LoRaWAN protocol
    Node transmission distance: up to 6KM in open space
  • Output power: up to +20dBm (±2dBm)

WiFi

  • 802.11 b/g/n/e/i
    802 802.11 n (2.4GHz), speed up to 150Mbps
    802 802.11 e: QoS mechanism to implement wireless multimedia technology
  • WMM-PS, UAPSD
  • MPDU and A-MSDU frame aggregation technology
    Block reply, fragmentation and reorganization
  • Beacon automatic monitoring / scanning
    802 802.11 i security features: pre-authentication and TSN
  • Support WPA / WPA2 / WPA2-Enterprise / WPS encryption
  • Infrastructure BSS Station Mode / SoftAP Mode
  • Wi-Fi Direct (P2P), P2P discovery, P2P GO mode and P2P power management
  • Support for IPv6

Bluetooth

Bluetooth v4.2 full standard, including traditional Bluetooth (BR/EDR)
and Bluetooth Low Energy (BLE)

  • Supports standard Class-1, Class-2 and Class-3 without external power amplifier
  • Enhanced precision power control
  • Output power up to +10 dBm
  • NZIF receiver with BLE reception sensitivity of -128 dBm
    Adaptive Frequency Hopping (AFH)Standard HCI based on SDIO / SPI / UART interface
    High speed UART HCI up to 4 Mbps
  • Support BT 4.2 controller and host protocol stack
  • Service Discovery Protocol (SDP)
    Universal Access Application (GAP)
  • Security Management Protocol (SMP)
  • Low power Bluetooth
    ATT ATT / GATT
  • HID
  • Supports all GATT-based Bluetooth low energy applications
  • SPP-Like Low-Power Bluetooth Data Transmission Protocol
    BLE BLE Beacon
  • A2DP / AVRCP / SPP, HSP / HFP, RFCOMM
  • CVSD and SBC audio codec algorithms
    Bluetooth piconet (Piconet) and scatternet (Scatternet)

Human interaction

  • 0.49 inch OLED screen
  • button (reset and program)

power supply

  • Input power: USB, lithium battery
  • Output power: +5V (only when USB is powered), +3.3V
    Integrated lithium battery charging circuit
  • External power supply controlled by IO port to facilitate development board to enter low power consumption

interface

  • UART UART, SPI, I2C, I2S, Mirco SD card
  • 12 - bits ADC, 8 - bits DAC
  • 29 general GPIO ports

storage

  • FLASH: 64Mb (16MB)

Power consumption

  • Sleep current: 800uA

Mechanical structure

  • Size: 60mmX23mmX8mm
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