How to make the TFMINI rangefinder talk I2C

ppoirier · February 25, 2018, 8:29pm

@nicodh ok I did some test and I confirm the “0” distance when reading over 6 Meter outdoor.
An easy work around can be implemented using the Arduino , we output 7 Meter when the distance and the signal strength is below a certain level.

I uploaded an example on my github

github.com

patrickpoirier51/TFMINI_MAXBOTIX_EMULATOR/blob/master/BeneWake_TFMINI_I2C_Maxbotic_Outdoor_Limit/BeneWake_TFMINI_I2C_Maxbotic_Outdoor_Limit.ino#L74


   if(Index<8){
     Framereceived[Index]=inChar;
     Index++;
   }
   else{
      Framereceived[Index]=inChar;
      if( Framereceived[1]=='Y'){
       if(Checksum(Framereceived, 8)==Framereceived[8]){
       distance= (uint16_t)(((Framereceived[2] + (Framereceived[3]*256))+OffSet)/Scaling);
       strength = (uint16_t)(Framereceived[4] + (Framereceived[5]*256));
       if ( (strength < strLimit) && (distance <= distLow ))  {
           distance = OutdoorMax;
             }  
        }  
        }           
      for(uint8_t i=0;i<8;i++){
      Framereceived[i]=0;
      }
     Index=0;
   }
}

The outputs reads like this ( I can be adjusted with : strLimit = 10; distLow = 46; )