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.
Product |
Type① |
MCU |
FLASH |
Battery |
Battery Detect |
Vext③ |
Low Power④ |
Display |
WiFi LoRa 32 |
Dev-Board |
ESP32 |
4MB |
Lithium② |
x |
x |
x |
OLED (128×64) |
|
Dev-Board |
ESP32 |
8MB |
Lithium② |
√ |
√ |
800uA |
OLED (128×64) |
|
Dev-Board |
ESP32 |
8MB |
Lithium② |
√ |
√ |
800uA |
OLED (64×32) |
|
Dev-Board |
ESP32-PICO |
4MB |
Lithium② |
√ |
√ |
35uA |
x |
Wireless Shell (This item) |
Module |
ESP32-PICO |
4MB |
– |
√ |
x |
10uA |
x |
|
Dev-Board |
STM32L151CBU6 |
128kB |
Lithium |
x |
x |
7uA |
x |
|
Dev-Board |
STM32L151CCU6 |
256kB |
1/2 AA Lithium chlorine sulfite battery |
√ |
√ |
1.8uA |
x |
|
Dev-Board |
STM32L432KC |
256kB |
AAA x 2 |
√ |
√ |
5uA |
x |
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:
-Main control chip ESP32-PICO (dual-core 32-bit MCU + ULP core), with LoRa node chip SX1276;
-RF shielding(contain a shield shell) and other protection measures;
-Integrated WiFi, LoRa, Bluetooth network connections, both of them are IPEX socket;
-Support the Arduino development environment;
-(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, the serial number can be queried on this page);
-With good RF circuit design and basic low-power design (sleep current: 10uA theoretically), it is convenient for IoT application vendors to quickly verify solutions and deploy applications;
Source |
Parameter |
MCU |
ESP32-PICO-D4( 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 |
18 ± 2dB |
Hardware resources |
UART x 3; SPI x 2; I2C x 2; I2S x 1 |
12 – bits ADC; 8 – bits DAC |
44 general GPIO |
FLASH |
internal 4MB(32M-bits) SPI FLASH |
Interface |
LoRa antenna (IPEX) x 1; Wi-Fi / BLE antenna (IPEX) x 1 |
Size |
38.4 x 16.1mm |
External device power control (Vext) |
√ |
Low power design |
deep sleep mode 10uA |
Electrical characteristics |
Condition |
Minimum |
Typical |
Maximum |
Power Supply |
3.3V power supply(≥500mA) |
2.7V |
3.3V |
3.5V |
Power consumption(mA) |
WIFI scan |
|
115mA |
|
WIFI AP |
|
135mA |
|
LoRa 10dB emission |
|
100mA |
|
LoRa 12dB emission |
|
105mA |
|
LoRa 15dB emission |
|
120mA |
|
LoRa 20dB emission |
|
145mA |
|
Output |
External device power control Vext (3.3V) |
|
|
350mA |
Package includes:
1 x Wireless ESP32 ModuleFiles support:
How to install Heltec ESP32 Aduino Develoment Environment:
Wireless Shell Source Code:
Heltec ESP(ESP32 & ESP8266) framework (the basic of Heltec ESP series products Arduino running environment):
Heltec ESP32 library (must work with Heltec ESP framework):
Heltec ESP32 LoRaWAN library (a standard LoRaWAN protocol library provide by Heltec Automation, need a license to active: http://www.heltec.cn/search/):
Wireless Shell Pinout Diagram:
AutoCAD & 3D Drawing:
Reference Hardware Design:
Wireless Shell Reference Hardware Design Schematic:
Wireless Shell Schematic & PCB Package (Altium Designer 18.1.7):
Summary of Common Problems:
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