ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor for Arduino UNO MEGA2560 Nano Robot XBee ZigBee

These little modules work great and are sold in a group of 5 for a great price. All 5 come bundled in a single anit-static bag, and were well packaged. Also, did you see that last line where Elego mentions they include "a little gift"? I missed that, and it was a pleasant surprise. No spoilers, but that little gift was a great help in connecting up those sensors. The range is listed to 500 cm but I started to get large margin of errors past 400 cm. I also couldn't read closer than 4 cm (not 2 cm). To get a more accurate reading within the 4 cm to 400 cm range, I found taking a moving average of the last 3 readings to be good enough to do the trick. If you're not picky, one reading is sufficient. The PCB is well designed - it is the minimum size to hold the sonic sensors, rugged and firm. There are 4 pins; two for 5v and GND, 1 to TRIGGER it, and one to read the ECHO from. Usage is actually quite simple: 1. Send a pulse to the TRIGGER pin to start the ranging; 2. Measure the time in microseconds that it takes the ECHO pin to respond; 3. Divide the time taken by a constant (manufacturer provided; it is 58.0 for CM) to get the distance. I'm not sure how much Amazon will allow me to write in a review, but I'm including the minimalist sketch (no comments) below to get you started (for Arduino, sorry, I'm not familiar with Pi). This will loop the ranging while reporting the distance in CM to the SERIAL MONITOR window in the Arduino IDE every second: --- Example Minimalist Sketch for HC-SR04 in Arduino -- /* HC-SR04 Sonic Ranging Sensor 5v to VCC 7 to Trig 8 to Echo GND to GND */ void setup() { pinMode(7, OUTPUT); digitalWrite(7, LOW); Serial.begin(9600); } void loop() { unsigned long start; digitalWrite (7, HIGH); delayMicroseconds(10); digitalWrite (7, LOW); // Wait - for ECHO pulse while (digitalRead(8) == 0); start = micros(); while (digitalRead(8) == 1); Serial.println ((micros() - start) / 58.0); delay(1000); } --- End ---

Awesome, good quality

Funziona perfettamente. Utilizzato per riempire una vasca fino a livello x.

These have worked great for sensing water level. I have had it sitting at the top of a sealed tank with two holes just big enough for the sensors to fit. I DIYed an enclosure out of an old plastic case that some GRK screws came in. This is absolutely not the recommended way to use them, but have been receiving accurate measurements for the last ~3 weeks with a 15 second update interval running 24/7.

Ottimi sensori poi arrivano pure con cavi maschio femmina e femmina femmina inclusi