Difference between revisions of "Lora Relay"
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: This Lora relay module is preloaded Arduino Pro mini(3.3v 8M) bootloader and simple demo firmware Lora Relay V1.1, the users could freely change/update the firmware with Arduino IDE, with a common UART tool (Note that if there no DTR in your UART tool, you will need to press reset button to reset the controller Mega328P manually).<br> | : This Lora relay module is preloaded Arduino Pro mini(3.3v 8M) bootloader and simple demo firmware Lora Relay V1.1, the users could freely change/update the firmware with Arduino IDE, with a common UART tool (Note that if there no DTR in your UART tool, you will need to press reset button to reset the controller Mega328P manually).<br> | ||
| − | Lora Relay transceivers feature the LoRa long range modem that provides ultra-long range spread spectrum communication and high interference immunity.<br> | + | : Lora Relay transceivers feature the LoRa long range modem that provides ultra-long range spread spectrum communication and high interference immunity.<br> |
: Lora Relay offers bandwidth options ranging from 7.8125kHz to 500 kHz with spreading factors ranging from 6 to 12, there are three choices of the working frequency.<br> | : Lora Relay offers bandwidth options ranging from 7.8125kHz to 500 kHz with spreading factors ranging from 6 to 12, there are three choices of the working frequency.<br> | ||
Revision as of 04:14, 24 June 2020
Contents
Introduction
Warning: If Lora Relay is used for controlling AC110V/AC220V Devices, be aware of safety.
- This is a relay module that could be controlled by Lora, with max current 30A/240V. Based on RFM98W, it support max 4~5 km Lora communication.
- This Lora relay module is preloaded Arduino Pro mini(3.3v 8M) bootloader and simple demo firmware Lora Relay V1.1, the users could freely change/update the firmware with Arduino IDE, with a common UART tool (Note that if there no DTR in your UART tool, you will need to press reset button to reset the controller Mega328P manually).
- Lora Relay transceivers feature the LoRa long range modem that provides ultra-long range spread spectrum communication and high interference immunity.
- Lora Relay offers bandwidth options ranging from 7.8125kHz to 500 kHz with spreading factors ranging from 6 to 12, there are three choices of the working frequency.
| Item | Lora Module | working frequency |
| Lora Relay 433M | RFM98W-433MHz/SX1278 | 433MHz |
| Lora Relay 868M | RFM95W-868MHz | 433MHzcommunication is established. |
| Lora Relay 915M | RFM95W-915MHz | 915MHz |
Free ISM bands world Wide(come from TI)
Lora Relay based on the Arduino, users can program it with Arduino IDE, which is very easy especially suit for the none-programmers. There are also guide for users to learn how to create the first IoT project with this board, with which the starters can learn the hardware and programming skill quickly.
This guide help you the basic usage of Lora Relay.
Features
• ATMEL Atmega328P: High Performance, Low Power Atmel®AVR® 8-Bit Microcontroller
• RAM: 2KBytes.
• Flash:32Kbytes.
• EEPROM: 1Kbytes.
• Clock Speed: 8 MHz.
• Interface: UART.
• DC12V powered
• Default baud rate: 115200bps.
• Working Temperature: -20 ~ +85℃.
Interface Function
①U1:LTC555
②J1:UART interface
③U2:Atmega328P
④ISP: used for download bootloader
⑤RST:Reset button
⑥Lora Module
⑦
⑧Antenna interface
Usage
Required Materials
- 1. Lora Soil Moisture Sensor
- 2. Maduino Lora Radio
- 3. USB-to-UART tool
- 4. 2*AAA battery
- 5. microUSB Cable
- 6. PC
System diagram
Notice: Maduino Lora Radio and the Lora Soil Moisture Sensor must have the same work frequency. Otherwise, it receive nothing from another.
Lora Soil Moisture Sensor requires a USB-to-UART tool to upload firmware to it, you can get it from:
https://www.makerfabs.com/usb-uart-convertor-cp2102.html
Install the CP2102 driver from:
https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers
Hardware Connections
| Lora Soil Moisture Sensor | USB-to-UART Tool |
| 3V3 | 3V3 |
| GND | GND |
| RX | TXD |
| TX | RXD |
After a Arduino IDE installed, there is a default package to support Lora Soil Moisture Sensor(Arduino Zero ),
From the top Arduino IDE menu, select Tools-> Board-> Arduino Pro or Pro Mini
From the top Arduino IDE menu, select Tools-> Processor->Atmega328P(3.3V,8Mhz)
After inserted the USB-to-UART tool to you PC, select the related Port. In my PC, there is COM7 that may different in your PC.
Download the RadioHead file, click Add.ZIP.Library, select RadioHead.
https://github.com/Makerfabs/MaduinoLoraRadio
Open LoraTransmitterADCAHT10.ino, verify and upload the firmware to Lora Soil Moisture.
Modify the frequency macro according to your board is 433Mhz or 868Mhz or 915Mhz.
If your Lora board is 433MHz:
#define RF95_FREQ 433.0
If your Lora board is 868MHz:
#define RF95_FREQ 868.0
If your Lora board is 915MHz:
#define RF95_FREQ 915.0
Tips: Lora Soil Moisture designed as a product, so it not integrates the USB-to-UART on board. If you upload the firmware fails, press and hold the Reset button before upload the firmware. When the IDE shows below, then release the button that may helped to upload the firmware success. That’s we need a reset the MCU when upload the firmware.
Install the AAA*2 batteries and put the Lora Soil Moisture aside, now we need to make the Lora Radio Receiver.
2. Lora Radio Receiver.
Plug the Maduino Lora Radio to PC via microUSB cable.
Open the code LoraReceiver.ino
Select the Arduino Pro or Pro mini
Select ATmega328P(3.3V,8Mhz)
Verify and upload the firmware.
Result:
The Lora Soil Moisture will send messages via Lora Radio frequency. And the Maduino Lora Radio will receive the result and print them in the Serial Monitor.
We can see it gets the air humidity and temperature and soil moisture from the Lora Soil Moisture Sensor.
FAQ
You can list your questions here or contact with support@makerfabs.com for technology support.
