Arduino LoRa For STM32F103CB
An Arduino library for sending and receiving data using LoRa radios.
Semtech SX1276/77/78/79 wiring
| Semtech SX1276/77/78/79 | Arduino(STM32F103CB) |
|---|---|
| VCC | 3.3V |
| GND | GND |
| SCK | SCK |
| MISO | MISO |
| MOSI | MOSI |
| NSS | PA4 |
| NRESET | PC13 |
| DIO0 | PA1 |
| DIO1 | PB13 |
| DIO2 | PB12 |
| Charger Header J4 | Battery 3.7V Li |
|---|---|
| 1 | + |
| 2 | - |
| Charge Value | Arduino(STM32F103CB) |
|---|---|
| Divinder 430K/1.5M | PA0 |
Board Header Details
| Header J1 Pins | Arduino(STM32F103CB) |
|---|---|
| 1 | 3.3V |
| 2 | PB9 |
| 3 | PB8 |
| 4 | GND |
| 5 | GND |
| 6 | PB1 |
| 7 | PB0 |
| 8 | GND |
| 9 | PA2 |
| 10 | PA3 |
| 11 | PB10 |
| 12 | PB11 |
| 13 | GND |
| Header J2 Pins | Arduino(STM32F103CB) |
|---|---|
| 1 | 5V |
| 2 | GND |
| 3 | PB5 |
| 4 | PB4 |
| 5 | PB3 |
| 6 | PA15 |
| 7 | PA12 |
| 8 | PA11 |
| 9 | PA8 |
| 10 | PB15 |
| 11 | PB14 |
| 12 | GND |
| 13 | GND |
| Header J3 Pins | Arduino(STM32F103CB) |
|---|---|
| 1 | 3.3V |
| 2 | SWIO |
| 3 | SWCLK |
| 4 | GND |
| Header J5 Pins | Arduino(STM32F103CB) |
|---|---|
| 1 | 3.3V |
| 2 | GND |
| 3 | PB6/SCL |
| 4 | PB7/SDA |
| Header J7 Row One Pins | Arduino(STM32F103CB) | Header J7 Row Two Pins | Arduino(STM32F103CB) |
|---|---|---|---|
| 1 | 3.3V | 2 | 3.3V |
| 3 | BOOT0 | 4 | BOOT1 |
| 5 | GND | 6 | GND |
NOTES: While Programming through on board USB (CH340 USB to UART Driver required in windows) connected to STM32F103CB's PA10/USART1_RX and PA9/USART1_TX select the following in Arduino IDE
| Board :Generic STM32F103C Series |
| Variant : STM32F103CB(20k RAM,128k Flash) |
| CPU Speed:72MHz Normal |
| Upload Meathod: Serial |
| Port should be picked as per windows (Com 1,2,3 etc) |
To add STM32 board to arduino ide use https://github.com/rogerclarkmelbourne/Arduino_STM32
Header J7 should be set as following for programming
Pin 1 --- Pin 3 Short using Jumper
Pin 4 --- Pin 6 Short using Jumper
Press reset pin S3 before pressing upload button
Header J7 should be set as following to run application program
Pin 3 --- Pin 5 Short using Jumper
Pin 4 --- Pin 6 Short using Jumper
Press reset pin S3 after this
NSS, NRESET, and DIO0 pins can be changed by using LoRa.setPins(ss, reset, dio0). DIO0 pin is optional, it is only needed for receive callback mode. If DIO0 pin is used, it must be interrupt capable via attachInterrupt(...).
Installation
Using the Arduino IDE Library Manager
- Choose
Sketch->Include Library->Manage Libraries... - Type
LoRainto the search box. - Click the row to select the library.
- Click the
Installbutton to install the library.
Using Git
cd ~/Documents/Arduino/libraries/
git clone https://github.com/sandeepmistry/arduino-LoRa LoRaAPI
See API.md.
Examples
See examples folder.
FAQ
1) Initilizating the LoRa radio is failing
Please check the wiring you are using matches what's listed in Semtech SX1276/77/78/79 wiring. You can also use LoRa.setPins(ss, reset, dio0) to change the default pins used. Some logic level converters cannot operate at 8 MHz, you can call LoRa.setSPIFrequency(frequency) to lower the SPI frequency used by the library. Both API's must be called before LoRa.begin(...).
2) Can other radios see the packets I'm sending?
Yes, any LoRa radio that are configured with the same radio parameters and in range can see the packets you send.
3) Is the data I'm sending encrypted?
No, all data is sent unencrypted. If want your packet data to be encrypted, you must encrypt it before passing it into this library, followed by decrypting on the receiving end.
4) How does this library differ from LoRaWAN libraries?
This library exposes the LoRa radio directly, and allows you to send data to any radios in range with same radio parameters. All data is broadcasted and there is no addressing. LoRaWAN builds on top of LoRA, but adds addressing, encryption, and additional layers. It also requires a LoRaWAN gateway and LoRaWAN network and application server.
License
This libary is licensed under the MIT Licence.