Arduino Nano with Remote Communication Board RFM95

Using Arduino Sensors
1

I like to try Remote Communication Board RFM95 with arduino Nano.
What I understand RFM95 has 3.3V signals output.
Arduino Nano has 5V signals input.
My question is - should I use 3.3V/5V shifter?
Thx

2

A bidirectional level level shifter is required. If connected together without one, you will destroy the radio, the Arduino, or both.

Much better and easier to use a 3.3V Arduino, and connect the radio directly.

3

Thank you very much. I do not have arduino 3.3V.

4

by the time you purchase a level shifter and connect it up it would be simpler to buy a microcontroller which uses 3.3V logic, e.g.ESP32, ESP8266, RPi RP2040, Arduino PRO mini 3.3V, Arduino pro micro, etc etc

you could save yourself trouble by moving to a board which incorporates a microcontroller and a LoRa module, e.g. ttgo-lora32 , Adafruit Feather 32u4 LoRa, TTGO-Beam, Hiltec LoRa 32, The Things UNO, Adafruit RP2040 with RFM95, etc
this saves the problems of level shifters, jumper wires which give poor connections and intermittent faults, etc, e.g. see river level monitoring

5

Than you for your help. I have a couple of Arduino boards - and I thought I can use it for my simple project. I have ESP32 boards and I will change my design.
Thank You once again

6

the ESP32 connections I tend to use for the RFM95 are

// ESP32 connections
// ESP32 SCK pin GPIO18  to RFM95_pin SCK
// ESP32 MISO pin GPIO19  to RFM95_pin MISO
// ESP32 MOSI pin GPIO23  to RFM95_pin MOSI
// ESP32 pin GPIO5   to RFM95 SS
// ESP32 pin GPIO4   to RFM95 Reset
// ESP32 pin GPIO2   to RFM95 DIO0

but you can use any suitable GPIO pins for SS, REST and DIO0
if you wish to connect to LoRaWAN you also need to connect DIO1

for LoRa Point-to-Point the Arduino LoRa library is easy to use

7

Thank You very much - You saved me a lot of time to find this out.
Thank You

8

if you are using the LoRa.h library you need to call setpins() to configure the RFM95, e.g.

 // void setPins(int ss = LORA_DEFAULT_SS_PIN, int reset = LORA_DEFAULT_RESET_PIN, int dio0 = LORA_DEFAULT_DIO0_PIN);
  LoRa.setPins(5, 4, 2);  // for ESP32
  if (!LoRa.begin(866E6)) {

in the call to LoRa.begin() you set your frequency - in this case 866MHz for Europe

9

Thx once again. Will try

10

I added setpins() - it works. Thank you. I'm just wonder whey it is not included in example code of sender?
I changed frequency to 915E6 (NA)
Once again Thank You

11

the example code would be using the default pins - see Semtech SX1276/77/78/79 wiring
in Arduino LoRa

12

Thanks a lot.