Built-in project · no microcontroller
555 tone
A 555 astable drives a piezo straight from the output pin, no board and no button. There is no microcontroller in it: the simulator solves the 5 parts as a circuit, so it runs the moment you press Run, and nothing needs compiling.
Runs in your browser. Free, and no account needed.
Click to open it in the editor
The circuit itself, running here on the simulator. Press what can be pressed; click anything else to open it in the editor.
How it works
There is no microcontroller in this one, so nothing is compiled: the simulator solves the circuit itself. The file in the editor is the notes that come with it.
sketch.ino
// Mokxi: a 555 astable driving a piezo.
// There is no microcontroller here. Press Run and the simulator solves the
// circuit itself.
//
// f = 1.44 / ((R1 + 2 R2) C) = 1.44 / ((1k + 9.4k) x 100nF), about 1.4 kHz.
// Change R2 or C1 in the properties panel and the pitch moves with them.
Parts list
7 parts, plus the jumper wires. Every one is in the editor's parts bin.
- 1 × Full-size breadboard
- 1 × Power, 5 V
- 1 × Resistor, 1k Ω
- 1 × NE555 timer
- 1 × Resistor, 4.7k Ω
- 1 × Capacitor, 100 nF
- 1 × Piezo speaker
How it is wired
5 connections, pin by pin, read from the circuit itself. Each line is one set of pins joined together, by a jumper wire or a breadboard strip.
- 5 V: Resistor, 1k Ω pin 2; NE555 timer pin RESET; NE555 timer pin VCC
- Ground: NE555 timer pin GND; Capacitor, 100 nF pin 2; Piezo speaker pin 2
- NE555 timer pin TRIG; NE555 timer pin THR; Resistor, 4.7k Ω pin 2; Capacitor, 100 nF pin 1
- NE555 timer pin OUT; Piezo speaker pin 1
- NE555 timer pin DIS; Resistor, 4.7k Ω pin 1
Change it and keep it
Open it in the editor, change the circuit or the code, and keep your version in a free account.