![]() The impedance of the piezo matters here as well. but is going to produce a sharper OFF state, albeit one with less voltage. The "drive" is a bit disproportional and may "sound" less amplified on the ON state. This gives you a reduced voltage to the piezo in the ON state, and an reduced impedance during the OFF state. If you use a resistor divider, you are putting one resistor in series with the piezo from the driver pin, and one in parallel with the piezo to ground. Increase the single resistor and you effectively decrease the current to the piezo in the ON and OFF cycles. If you are driving your output high AND low, then a series resistor and a 50% duty cycle output charges and discharges the "capacitor" evenly. The piezo can be thought of as a capacitor. Here's a couple links to some code that may help: You can also put this code at the end of your loop() routine to keep it from looping over and over: while(true) //kill loop, while true do nothing You should hear a 2048Hz tone on your buzzer for 3 seconds. 1 / 2048Hz = 488uS, or 244uS high and 244uS low to create 50% duty cycle With this code: for (long i = 0 i < 2048 * 3 i++ ) If you replace this code: digitalWrite(buzzPin, HIGH) Given that you are driving it correctly now, you need to "stimulate" it. This will drop the 12V down to 3.5V for your buzzer, since it has a coil resistance of about 42ohms. 2W would be better, but you are only turning it on for 3 seconds so it shouldn't get too hot in that period of time. It should be obvious by now that you have the kind you need to stimulateīased on your buzzer's specs, I would change your resistor from 470ohms to 100ohms. Some buzzers "self-oscillate" at a particular frequency, and some need to be stimulated at a frequency to produce a sound. There actually is no problem with your code if you had the right buzzer. I assume the other pins you are sending HIGH are turning on some LEDs. They’re only given the RS PRO Seal of Approval if we’re confident of their exceptional quality, which means you can be confident too.Looks like you are trying to make a racing light. Trusted by engineers all over the world, every part of every RS PRO product has been rigorously tested against demanding industry standards RS PRO is our own brand range and brings you a wide range of high-quality, great value products offering you more choice. ![]() Maximum operating temperature of +85☌.Minimum operating temperature of -30☌.It’s used for alarms, as well as telephone dial tones and toy or game sounds. It’s safe for use in a temperature range between -30☌ and +85☌. This handy component has been extensively tested to meet the strictest RS PRO safety and quality standards. This piezo buzzer generates sounds with a much larger pressure level when you compare it to magnetic buzzers. Its ABS (acrylonitrile butadiene styrene) housing makes it highly shock- and chemical-resistant, and it boasts flying leads for quick connections. It features internal circuitry and can be fitted directly onto a printed circuit board (PCB). This buzzer can function with a low current of 14 mA. It has a resonant frequency of 2.8 kHz, plus you can easily wire it to release a continuous tone of up to 73 dB. Safely and simply generate sounds from your electronic equipment with this piezo buzzer from RS PRO. RS PRO 20 V DC, Panel Mount Buzzer, 73 dB Continuous
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