Solenoid Valve 12v 1/2in Solar Water Heater

Solenoid Valve 12v 1/2in Solar Water Heater Documentation

Overview

The Solenoid Valve 12v 1/2in Solar Water Heater is an electrically operated valve designed to control the flow of water in solar water heating systems. It is commonly used in residential and commercial applications to regulate the flow of hot water from the solar collector to the storage tank. This valve is designed to operate at 12V DC and has a 1/2 inch port size, making it suitable for a wide range of solar water heating systems.

Technical Specifications

Operating Voltage: 12V DC
 Port Size: 1/2 inch
 Flow Rate: Up to 15 L/min
 Operating Temperature: -20C to 90C
 Material: Brass
 Connection Type: Threaded

Pinout

The solenoid valve has two terminals:

Positive (VCC): Connect to 12V DC power supply
 Negative (GND): Connect to ground

Code Examples

### Example 1: Basic On/Off Control using Arduino

This example demonstrates how to control the solenoid valve using an Arduino board.
```c++
const int valvePin = 2; // Solenoid valve connected to digital pin 2

void setup() {
  pinMode(valvePin, OUTPUT);
}

void loop() {
  // Open the valve (active high)
  digitalWrite(valvePin, HIGH);
  delay(10000); // Keep the valve open for 10 seconds
  
  // Close the valve (active low)
  digitalWrite(valvePin, LOW);
  delay(10000); // Keep the valve closed for 10 seconds
}
```
### Example 2: Temperature-Based Control using Raspberry Pi and Python

This example demonstrates how to control the solenoid valve based on temperature readings from a DS18B20 temperature sensor using a Raspberry Pi and Python.
```python
import RPi.GPIO as GPIO
import time

# Set up GPIO mode
GPIO.setmode(GPIO.BCM)

# Set up solenoid valve pin
valve_pin = 17
GPIO.setup(valve_pin, GPIO.OUT)

# Set up temperature sensor pin
temp_pin = 4
GPIO.setup(temp_pin, GPIO.IN)

while True:
    # Read temperature from DS18B20 sensor
    temp = read_temperature(temp_pin)
    
    if temp > 45: # Open valve if temperature is above 45C
        GPIO.output(valve_pin, GPIO.HIGH)
    else: # Close valve if temperature is below 45C
        GPIO.output(valve_pin, GPIO.LOW)
    
    time.sleep(1)
```
Note: In this example, the `read_temperature()` function is assumed to be a custom function that reads the temperature from the DS18B20 sensor and returns the value in Celsius.

### Example 3: Timer-Based Control using ESP32 and MicroPython

This example demonstrates how to control the solenoid valve using a timer-based approach with an ESP32 board and MicroPython.
```python
import machine
import utime

# Set up solenoid valve pin
valve_pin = 27
machine.Pin(valve_pin, machine.Pin.OUT)

# Set up timer
timer = machine.Timer(0)

def valve_control(timer):
    # Open valve for 10 minutes
    machine.Pin(valve_pin, machine.Pin.HIGH)
    utime.sleep(600) # 10 minutes
    
    # Close valve for 10 minutes
    machine.Pin(valve_pin, machine.Pin.LOW)
    utime.sleep(600) # 10 minutes

timer.init(period=1200000, mode=machine.Timer.PERIODIC, callback=valve_control)
```
Note: In this example, the timer is set to trigger the `valve_control()` function every 20 minutes, which opens and closes the valve alternately for 10 minutes each.

These code examples demonstrate how to control the Solenoid Valve 12v 1/2in Solar Water Heater in various contexts, including basic on/off control, temperature-based control, and timer-based control.