Turtle Board 868MHz (Heltec)
The turnkey Turtle board solution can be used immediately. Support standard LoRaWAN protocol and RadioShuttle protocol. The included RadioShuttle radio protocol software enables node-to-node communication without additional routers and servers. The Turtle LoRa board by HelTec Automation can run 10 years on AAA batteries (standard or rechargeable NiMH) using the “RadioShuttle” LoRa wireless low-energy protocol software.
About RadioShuttle protocol
RadioShuttle Protocol is a node-to-node LoRa wireless communication protocol software. Compare with LoRaWAN(TM), which is capable of efficiently sending messages in a fast and secure way, any node can work as a gateway. We also provide the MQTT server and IOS / Android APP examples source code.
LoRaWANTM
RadioShuttle
Concentrator required
No concentrator required, the station uses regular LoRa module
Network subscription fees (If use MQTT server)
No monthly fees
One large radio cell
Many small independent radio cells
Busy network in a radius of many kilometers
Small networks with no interference
Single point of failure (Concentrator)
Automatic transmitting power adjustment – longer battery life
High latency, larger spreading factor, e.g. SF11 (1320 ms)
Low latency, small spreading factor, e.g. SF7 (120 ms)
Turtle Board is a highly integrated, fully functional board (part of the ``Heltec LoRa`` series) with the following features:
- CE Certificate;
- Microprocessor: STM32L432KC (32-bit ultra-low power MCU) with LoRa node chip SX1276;
- Micro USB interface with complete protection measures such as voltage regulation, ESD protection, and short circuit protection;
- Onboard AAA x 2 battery holder, USB / battery power automatically switch;
- Reserve IPEX and SMA antenna interfaces for LoRa use;
- Programming and debugging interface can be combined with our downloader
- Support DFU protocol, which can be downloaded conveniently via USB (combined with “RadioShuttle STM32 Utility”)
- Professional software support (ARM Mbed IDE);
- Provide Standard LoRaWAN protocol routines;
- Good RF circuit design and perfect low-power design (sleep current: 4uA), which is convenient for IoT application vendors to quickly verify solutions and deploy applications;
Technical Parameters
|
Source |
Parameter |
|
MCU |
STM32L432KC(Ultra-low-power 32-bit MCU+FPU ARM® Cortex®-M4) |
|
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 Resource |
USART x 3; SPI x 2; I2C x 2; SAI x 1; USB 2.0 x 1 |
|
12 – bits ADC x 1; 12 – bits DAC x 2 |
|
|
DMA controller |
|
| 26 general GPIO |
|
|
Flash |
256KB FLASH；64KB SRAM； |
|
Interface |
Micro USB x 1; LoRa antenna(SMA) x 1，Debug interface（8-Pin） |
|
Size |
56.6 x 24 x 20 mm |
|
Battery Type |
AAA x 2 |
|
Battery detection circuit |
√ |
|
External device power control（Vext） |
√ |
|
Low power design |
Deep Sleep: 4uA |
Electrical characteristics
Electrical characteristics
Power Supply
USB powered（≥500mA）
4.7V
5V
6V
Lithium powered（≥250mA）
1.8V
3V
3V
3.3V（pin）powered（≥150mA）
2.7V
3.3V
3.5V
5V（pin）powered（≥500mA）
4.7V
5V
6V
Power consumption(mA)
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
https://www.radioshuttle.de/wp-content/uploads/2019/03/Turtle-Data_sheet.pdf
https://www.radioshuttle.de/en/turtle-en/turtle-board-en/
https://www.radioshuttle.de/en/radioshuttle-en/protocol/
https://www.radioshuttle.de/en/turtle-en/radioshuttle-stm32-utility-en/
https://docs.heltec.cn/download/Turtle_Board.pdf
https://docs.heltec.cn/#/en/products/lora/lora_node/heltec_lora_node_list_eu
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