This LM2596-based adjustable buck converter steps down a higher DC input to a lower DC output with good efficiency. It is commonly used to power Arduino and ESP32 projects from a higher-voltage supply, and the output voltage is set with the onboard trimmer potentiometer.
| Pin | Signal | Description |
|---|---|---|
OUT+ |
power | Regulated positive DC output from the buck converter, set by the trimmer. |
OUT- |
ground | Output negative/ground return for the regulated DC load. |
IN+ |
power | Positive DC input supply to the buck converter, typically 3–40 VDC. |
IN- |
ground | Input negative/ground return for the DC supply. |
| From | To | Wire |
|---|---|---|
board:5V |
x1:IN+ |
red |
board:GND |
x1:IN- |
black |
x1:OUT+ |
board:5V |
red |
x1:OUT- |
board:GND.1 |
black |
This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.
// Canonical example for an LM2596 adjustable step-down module
// This sketch reads the Arduino's 5V rail as a simple voltage check.
// Wiring note: the LM2596 is connected to the Arduino power rails in this example.
void setup() {
Serial.begin(9600);
while (!Serial) {
;
}
Serial.println("LM2596 adjustable step-down module example");
Serial.println("The module is wired to the Arduino power rails.");
}
void loop() {
int raw = analogRead(A0);
float volts = raw * (5.0 / 1023.0);
Serial.print("A0 reading = ");
Serial.print(raw);
Serial.print(" approx volts = ");
Serial.println(volts, 3);
delay(1000);
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