) If you want to use an LCD (or LED) display to show the alarm-temperature and/or the actual current temperature, then a microcontoller and a bit of programming would be useful. (A regular 'ol thermostat doesnt have a "brain" or memory. Fine-tune the parameters of the Arduino program and the sound sensor's potentiometer until you get the desired results. Power the TV Loudness Guard and place it next to your TV. It's OK if you want to make an Arduino project, but you don't really need a microcontroller or programming for such simple logic. Update the TV Loudness Guard program with the remote control button code captured from step 1 and upload the program to your Arduino. ![]() make an alarm when for example temperature is above a certain value. (I have a "ding dong" device as a pre-alarm on my home & car alarms. However, most buzzers require a bit more current so you'll need a MOSFET to boost the current/voltage. So, you can simply turn it on & off with an Arduino pin, just like you turn on & off an LED. A regular (voice coil) speaker takes more current and it needs an amplifier.Īn "active" buzzer generates the sound itself. (It shouldn't be an issue in your application.) A piezo speaker can be driven directly from the Arduino (probably with a series resistor). Arduino Uno 12x 10k resistors Audio amplification Arduino MIDI Interfaces for MIDI receiving Breadboard and jumper wires The Circuit The circuit is effectively one large passive mixer combining all output pins into a single output which can (if you squint) be plugged into some amplification. This could be an issue if your program (sketch) is doing lots of other things at the same time. The only downside (besides a bit of extra programming) is that it takes processor-time to generate the sound. With enough hardware & software you could make it play music. ![]() The Arduino needs to generate the "tone". so we get 500 millisecond of tone separated by 500 milliseconds of quiet. With a "passive" device or speaker, you have to send it an AC "sound signal" and you can control the sound. Learn some best practices for coding with Arduino, distilled down into 10 easy.
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