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Cost performance ratio is excellent. All 3 sensors arrived in good condition. But be aware: The HC-SR04 has a well-known bug (or is this really a feature???): The sensor can stuck after measuring our of range. It delivers zero distance values permanently, even if something is quite close. There is a software workaround: if (distance==0) { pinMode(echoPin, OUTPUT); digitalWrite(echoPin, LOW); pinMode(echoPin, INPUT); } // OR this one if (distance == 0 && digitalRead(ECHO_PIN) == HIGH) { pinMode(ECHO_PIN, OUTPUT); digitalWrite(ECHO_PIN, LOW); delay(100); pinMode(ECHO_PIN, INPUT); } } For more see here: https://forum.arduino.cc/index.php?topic=55119.45 https://bitbucket.org/teckel12/arduino-new-ping/issues/3/hc-sr04-sensor-get-stuck-at-zero
Prodotto di ottima qualità.
I recommend it very useful and arrived in perfect condition.
Arrivati in buone condizioni e puntuali
Suoer
ممتاز جدا مفيده للاردوينيو
De acordo com as informações do anúncio.
I ordered these for a parking lot problem for a company, let's hope I need some more. For now, they'rrrrrrre grrreat! Everyone works fine, no problems. Heaps of tutorials online as well. Read the data sheet too, they are really simple, hook one up to a 555.
l ho montato su un F450 con Flight control F3...funziona bene devo perfezionare l alt/PID...per avere una risposta perfetta..vale la spesa
Bom sensor ultra-sônico para meus projetos