Hi all
I’m trying to run the PiicoDev Buzzer (p18 / WPI4050) from an Arduino Nano powered at 3.3 V. It appears on I²C at 0x5C and ACKs all writes, but never makes a sound (LED solid). The same buzzer works perfectly on my Raspberry Pi using the Python demo.
I have the Arduino wired with a piicodev breadboard adapter to the buzzer
GND → GND
3V3 → 3.3V
SDA → A4 (analog pin 4 / I²C SDA)
SCL → A5 (analog pin 5 / I²C SCL)
Couldn’t find any libraries for the buzzer.
Here’s the sketch I used:
#include <Wire.h>
#define BUZZER_ADDR 0x5C
void setup() {
Serial.begin(115200);
Wire.begin();
Wire.setClock(100000);
delay(1000); // let buzzer boot
Serial.println("PiicoDev Buzzer V2 test");
}
void loop() {
playTone(1000, 1000);
delay(2000);
playTone(2000, 1000);
delay(4000);
}
void playTone(uint16_t freq, uint16_t dur) {
Serial.print("Writing frequency "); Serial.println(freq);
writeReg16(0x00, freq);
delay(10);
Serial.print("Writing duration "); Serial.println(dur);
writeReg16(0x02, dur);
delay(10);
Serial.println("Triggering play command");
writeReg8(0x04, 0x01);
delay(10);
}
void writeReg16(uint8_t reg, uint16_t val) {
Wire.beginTransmission(BUZZER_ADDR);
Wire.write(reg);
Wire.write(val >> 8);
Wire.write(val & 0xFF);
uint8_t err = Wire.endTransmission();
Serial.print("Write16 reg "); Serial.print(reg, HEX);
Serial.print(" err="); Serial.println(err);
}
void writeReg8(uint8_t reg, uint8_t val) {
Wire.beginTransmission(BUZZER_ADDR);
Wire.write(reg);
Wire.write(val);
uint8_t err = Wire.endTransmission();
Serial.print("Write8 reg "); Serial.print(reg, HEX);
Serial.print(" err="); Serial.println(err);
}
Serial output (when connected):
Writing frequency 1000
Write16 reg 0 err=0
Writing duration 1000
Write16 reg 2 err=0
Triggering play command
Write8 reg 4 err=0
All writes are ACKed (err=0), yet no sound is produced.
What am I doing wrong?
