Solid State Relay SSR-25DD DC-DC 25A 3-32VDC / 5-200VDC

Description

What it is

The solid state relay SSR-25DD is a device used to automatically control electrical circuits. This type of relay does not have moving mechanical parts but uses semiconductors to close or open the connection.

Features

• Type: Solid State Relay SSR-25DD
• Maximum Current: 25A
• Various voltage levels accepted (check the datasheet)

What it is for

The solid state relay is ideal for makers who want to control high loads from Arduino or other microcontrollers. It can be used to create automatic control systems, for example, to turn an outdoor light on and off based on light conditions.

Tutorial: How to use Solid State Relay SSR-25 DD DC-DC

The solid state relay SSR-25DD is ideal for controlling electrical circuits from Arduino or other microcontrollers. It is suitable for makers looking for a simple and efficient way to manage high loads.

What you need

• Arduino Uno
• Solid State Relay SSR-25DD
• Jumper wire
• External power supply

Steps

1. Connect the control port (IN) of the relay to the Arduino digital pin.
2. Connect the relay power supply (+ and -) to the external power supply, check the datasheet for voltage limits.
3. Connect the load to be controlled to the relay output circuit (COM and NO/C).
4. Write the Arduino sketch to manage the activation/deactivation of the relay.
5. Upload the sketch to the microcontroller.
6. Test the relay function by turning the connected load on and off.

Example code

//Sketch di esempio
int relayPin = 7; //Collegamento alla porta digitale dell'Arduino
void setup() {
  pinMode(relayPin, OUTPUT);
}
void loop() {
  digitalWrite(relayPin, HIGH); //Attiva il relè
  delay(2000);
  digitalWrite(relayPin, LOW); //Disattiva il relè
  delay(2000);
}

Mini project

Create an automatic control system for an outdoor light that turns on at sunset and off at sunrise.

Common mistakes

• Do not verify the load compatibility with the relay.
• Ignore the minimum and maximum voltage allowed by the relay.
• Connect the Arduino directly to the output circuit without protection.
• Omit a decoupling capacitor between power supply and relay input.

Recommended accessories

• Current limiting resistor
• Decoupling capacitor 100nF
• Arduino Prototyping Shield
• Ambient Light Sensors

Frequently asked questions

Can the relay handle AC loads?
Check the datasheet, the SSR-25DD model is primarily designed for DC.

How long does it take to change state?
Check the datasheet for the activation/deactivation delay specification.

Can I connect it directly to the Arduino?
No, use a digital pin as an intermediary.