What is it ?

A small software that allows to measure the receiver sensitivity of Lilygos modules T-beam and T3.

Why ?

Sometimes, you can doubt of a module that seems to have receiving problems.

Injecting a signal with a known value, you can check this.

This software puts the module in receive mode and displays the RSSI value in dBm of the input signal.

How ?

• Connect a signal generator at the antenna connector with a known value, modulated or not.

• Load the software on Visual Studio Code with PlatformIO compiler.

• Change to settings to fit to your board.

• Reboot the module that will display the RSSI value of the received signal.

  The noise floor (without any antenna or signal) is around -118dBm

Settings

#define Lilygo_Tbeam               // LilyGo T-beam board. Comment out for this board
//#define Lilygo_T3                 // LilyGo T3 board. Comment out for this board
//#define ssd1306                   // defines the OLED driver type comment if using SSD1306 driver. Comment if 1.3" inch uses SH1106
double RXfreq = 433.775;            // frequency in MHz

Comment the unused lines and enter the desired frequency

The upper lines are for a T-beam module with an OLED using the SSH1106 driver.

Note

You must change the frequency, depending of your LoRa band supported by your LoRa module.