Precise details:
Heltec LoRa Node Products Difference Table:
“Heltec LoRa” product family already included follow options:
LoRa spread spectrum communication (node);
Battery powered;
Good RF circuit design and impedance matching.
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;
④ – Low Power: Products’ low power design, of Whole Circuit, the measured data are the current of the system during deep sleep.
Feature:
-Microprocessor: ESP32 (dual-core 32-bit MCU + ULP core + Internal 4MB FLASH), with LoRa node chip SX1276;
-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;
-Integrated CP2102 USB to serial port chip, convenient for program downloading, debugging information printing;
-Support the Aduino development environment;
-(Exclusive) Supports the Aduino 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, the serial number can be queried on this page);
-With good RF circuit design and good low-power design (sleep current ≤ 30uA), 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 |
|
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 |
None |
|
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 30uA |
|
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 the input current |
/ |
|
External device power control (Vext 3.3V) |
/ |
/ |
350mA |
Package includes:
1 x Wireless ESP32 Stick Lite
File support:
