Circuit Documentation

Summary

This circuit is designed to control a water pump based on soil moisture levels. It uses a 7805 voltage regulator to provide a stable 5V supply, a relay to switch the water pump, and a soil moisture sensor to detect the moisture level. An LED is included to indicate the status of the circuit.

Component List

1. 7805 Voltage Regulator

   • Description: Provides a stable 5V output from a higher voltage input.
   • Pins: Vin, Gnd, Vout

2. 9V Battery

   • Description: Provides the primary power source for the circuit.
   • Pins: +, -

3. Toggle Switch

   • Description: Allows manual control to turn the circuit on or off.
   • Pins: L1, COM, L2

4. LED: Two Pin (red)

   • Description: Indicates the status of the circuit.
   • Pins: Cathode, Anode

5. Resistor

   • Description: Limits the current through the LED.
   • Pins: Pin1, Pin2
   • Properties: Resistance: 200 Ohms

6. 5V Relay

   • Description: Switches the water pump on or off based on the control signal.
   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

7. Water Pump

   • Description: Pumps water when activated.
   • Pins: VCC, GND

8. SparkFun Soil Moisture Sensor

   • Description: Measures the moisture level in the soil.
   • Pins: VCC, GND, SIG

Wiring Details

7805 Voltage Regulator

• Vin: Connected to L2 of the Toggle Switch
• Gnd: Connected to GND of the 5V Relay, GND of the 9V Battery, GND of the Soil Moisture Sensor, and Pin2 of the Resistor
• Vout: Connected to VCC of the 5V Relay, VCC of the Soil Moisture Sensor, and Cathode of the LED

9V Battery (Primary)

• +: Connected to COM of the Toggle Switch
• -: Connected to GND of the 5V Relay, GND of the Soil Moisture Sensor, GND of the 7805 Voltage Regulator, and Pin2 of the Resistor

9V Battery (Secondary)

• +: Connected to Common terminal of the 5V Relay
• -: Connected to GND of the Water Pump

Toggle Switch

• L1: Not connected
• COM: Connected to + of the Primary 9V Battery
• L2: Connected to Vin of the 7805 Voltage Regulator

LED: Two Pin (red)

• Cathode: Connected to Vout of the 7805 Voltage Regulator
• Anode: Connected to Pin1 of the Resistor

Resistor

• Pin1: Connected to Anode of the LED
• Pin2: Connected to GND of the 5V Relay, GND of the 9V Battery, GND of the Soil Moisture Sensor, and GND of the 7805 Voltage Regulator

5V Relay

• Normally Open: Connected to VCC of the Water Pump
• Common terminal: Connected to + of the Secondary 9V Battery
• Normally Closed: Not connected
• In: Connected to SIG of the Soil Moisture Sensor
• GND: Connected to GND of the 9V Battery, GND of the Soil Moisture Sensor, GND of the 7805 Voltage Regulator, and Pin2 of the Resistor
• VCC: Connected to Vout of the 7805 Voltage Regulator

Water Pump

• VCC: Connected to Normally Open of the 5V Relay
• GND: Connected to - of the Secondary 9V Battery

SparkFun Soil Moisture Sensor

• VCC: Connected to Vout of the 7805 Voltage Regulator
• GND: Connected to GND of the 5V Relay, GND of the 9V Battery, GND of the 7805 Voltage Regulator, and Pin2 of the Resistor
• SIG: Connected to In of the 5V Relay

Code

There is no code provided for this circuit.