Hi! My friend and I are trying to use a TF-Luna LiDAR sensor with our Arduino UNO board.
We are using a popular code segment that seems to pop up everywhere for TF-Luna:
/* File Name: TFLI2C_simple.ino
* Developer: Bud Ryerson
* Date: 4 NOV 2021
* Version: 0.1.2
* Described: Simplified Arduino example sketch for the Benewake
* TF-Luna LiDAR sensor configured for the I2C interface
*/
#include <Arduino.h> // every sketch needs this
#include <Wire.h> // instantiate the Wire library
#include <TFLI2C.h> // TFLuna-I2C Library v.0.2.0
TFLI2C tflI2C;
int16_t tfDist; // distance in centimeters
int16_t tfAddr = TFL_DEF_ADR; // use this default I2C address or
// set variable to your own value
void setup()
{
Serial.begin( 9600); // initialize serial port
Wire.begin(); // initialize Wire library
Serial.println( "TFLI2C example code simplified"); // say "Hello!"
Serial.println( "4 NOV 2021"); // and add date
}
void loop()
{
if( tflI2C.getData( tfDist, tfAddr)) // If read okay...
{
Serial.print("Dist: ");
Serial.println(tfDist); // print the data...
}
else tflI2C.printStatus(); // else, print error.
delay( 50);
}
Unfortunately, this code seems to hang (not timing out, giving an error, or giving an output infinitely) at if( tflI2C.getData( tfDist, tfAddr)) // If read okay...
We have pin 1 of the Luna plugged into 5v, pin 2 into SDA, pin 3 into SCL, pin 4 into GND, pin 5 into GND, and pin 6 unplugged.
We also tried to use an I2C Scanner to find the issue but that hands as well, here is the code:
// --------------------------------------
//http://playground.arduino.cc/Main/I2cScanner
// i2c_scanner
//
// Version 1
// This program (or code that looks like it)
// can be found in many places.
// For example on the Arduino.cc forum.
// The original author is not know.
// Version 2, Juni 2012, Using Arduino 1.0.1
// Adapted to be as simple as possible by Arduino.cc user Krodal
// Version 3, Feb 26 2013
// V3 by louarnold
// Version 4, March 3, 2013, Using Arduino 1.0.3
// by Arduino.cc user Krodal.
// Changes by louarnold removed.
// Scanning addresses changed from 0...127 to 1...119,
// according to the i2c scanner by Nick Gammon
// http://www.gammon.com.au/forum/?id=10896
// Version 5, March 28, 2013
// As version 4, but address scans now to 127.
// A sensor seems to use address 120.
// Version 6, November 27, 2015.
// Added waiting for the Leonardo serial communication.
//
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
// Watch Video explainign I2C address: https://www.youtube.com/watch?v=bqMMIbmYJS0
//
#include <Wire.h>
void setup()
{
Wire.begin();
Serial.begin(9600);
while (!Serial); // Leonardo: wait for serial monitor
Serial.println("
I2C Scanner");
}
void loop()
{
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for(address = 1; address < 127; address++ )
{
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address<16)
Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
else if (error==4)
{
Serial.print("Unknown error at address 0x");
if (address<16)
Serial.print("0");
Serial.println(address,HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found
");
else
Serial.println("done
");
delay(5000); // wait 5 seconds for next scan
}
The point at which this hangs is error = Wire.endTransmission();
We are hoping to get an input from this lidar for a hackathon tomorrow (today because it's 1am) and can't figure out what we are doing wrong. Can anyone help?
