UNO + HB100 + LCD - Project Guidance - Arduino Forum

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Hi guys. My name is Bernardo, from Argentina.

I am on a speed radar project for private neighborhoods.

The materials I use are: -Arduino uno -HB100 by limpkin -LCD display 12x2 -Battery 12v 7ah

I have tried several codes, using libraries, or not. Inside the house it works, running or walking, but when I take it to the street, sometimes it works, sometimes it doesn't. Is it a hardware or code problem? Or is the sensor not suitable for this project?

Code

#include <FreqPeriod.h> #include <Wire.h> // libreria de comunicacion por I2C #include <LCD.h> // libreria para funciones de LCD #include <LiquidCrystal_I2C.h> // libreria para LCD por I2C LiquidCrystal_I2C lcd (0x27, 2, 1, 0, 4, 5, 6, 7); // DIR, E, RW, RS, D4, D5, D6, D7 double lfrq; long int pp; void setup() { Serial.begin(9600); FreqPeriod::begin(); lcd.setBacklightPin(3,POSITIVE); // puerto P3 de PCF8574 como positivo lcd.setBacklight(HIGH); // habilita iluminacion posterior de LCD lcd.begin(16, 2); // 16 columnas por 2 lineas para LCD 1602A lcd.clear(); // limpia pantalla Serial.println("FreqPeriod Library Test"); } void loop() { pp = FreqPeriod::getPeriod(); if (pp) { //Serial.print ("period: "); //Serial.print(pp); //Serial.print(" 1/16us / frequency: "); lfrq = 16000400.0 /pp; //Serial.print(lfrq); //Serial.print(" Hz "); //lcd.setCursor(0,0); Serial.print(lfrq/19.49); Serial.println( "km/h"); lcd.print(lfrq/19.49); lcd.print( "km/h"); delay(200); lcd.clear(); } }

I want it to work like in this video And the code that Markus shares, I modified it to show on the display, it works running or walking (at a distance of 3 meters), but with cars it does not seem to work.

2268×4032 2.03 MB

At that time I was with 9v batteries, now it is with 12v directly to arduino (I would be missing a stepdown)

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