9. Output Devices
Group assignment:
Measure the power consumption of an output device.
This week we tired to measure power consumption of the output that we are going to use for our final projects.
Lock-style Solenoid - 12VDC
Technical specifications of the solenoid:
⚡ Power and Electrical Specs
- Voltage: 9V–12V DC (lower voltage results in weaker/slower operation)
- Current Draw: 650mA at 12V, 500mA at 9V
- Activation Time: 1–10 seconds📏 Dimensions
- Max Dimensions: 41.85mm (1.64") × 53.57mm (2.1") × 27.59mm (1.08")
- Body Dimensions: 23.57mm (0.92") × 67.47mm (2.65") × 27.59mm (1.08")
- Wire Length: 222.25mm (8.75")⚖️ Weight
- 147.71g
We refer this link to learn about the solenoid.
The power consumed by the solenoid can be calculated using the formula:
🔌 Power Consumption Calculation
Given:
- Voltage (V):12V
- Current (I):650mA=0.65A
Formula:P = V × I
Calculation:12V × 0.65A = 7.8W
Result: The power consumption is 7.8 watts.
We conducted the practical measurement using the oscilloiscope. We gave the current of 3.2A and 12VDC.The default state of the solenoid is locked. When we gave the 12V DC the it unlock. We connect the VCC and GND of the solenoid to the osilliscope as shown in the image below.
Here is the short video on
By doing this help us to see actual power consumed with the calculated power. The actual power consumed is 10.52W
From the pratical measurement we observed the following:
Mini Water Pump
Specifications:
Model - JT80SL
Length (including the inlet): 53mm
Diameter: 24mm
Approximate weight: 30g
Height (including water inlet): 31mm
Water inlet: Outer diameter 7.60mm, inner diameter 5.75mm
Water outlet: Outside diameter 7.30mm, inner diameter 5.30mm
Voltage range: DC 2.5V to 6V
Operating current: 130mA to 220mA
Hydraulic head: 40 to 110 cm
Flow: 80 to 120 Ltr/Hour
Power: 0.4 to 1.5 W
we calculated the power consumption using he datasheet value:
🔌 Power Consumption Calculation
Given:
🔹 Voltage (V) =6V
🔹 Current (I) =220mA=0.22A
Formula:P = V × I
Calculation:6V × 0.22A = 1.32W
💡 Result: The power consumption is 1.32 watts.
We made the connection as shown in the image below and the gave the value 6V with 220mA current and observe the power consumed by the pump.
From the pratical measurement we observed the following:
Here’s a short video demonstrating how the mini water pump creates pressure to move water efficiently from one source to another.
MG996R Servo Motor
Specifications
Operating Voltage: +5V typically
Current: 2.5A (6V)
Stall Torque: 9.4 kg/cm (at 4.8V)
Maximum Stall Torque: 11 kg/cm (6V)
Operating Speed: 0.17 s/60°
Gear Type: Metal
Rotation: 0°-180°
Weight of Motor: 55g
Package Includes: Gear horns and screws
We refer the code from the link and run the code in ide to test the servo motor.
#include <Servo.h>
Servo servo; // create servo object to control a servo
void setup() {
servo.attach(9); // attaches the servo on pin 9 to the servo objectư
servo.write(0); // rotate slowly servo to 0 degrees immediately
}
void loop() {
for (int angle = 0; angle <= 180; angle += 1) { // rotate slowly from 0 degrees to 180 degrees, one by one degree
// in steps of 1 degree
servo.write(angle); // control servo to go to position in variable 'angle'
delay(10); // waits 10ms for the servo to reach the position
}
for (int angle = 180; angle >= 0; angle -= 1) { // rotate from 180 degrees to 0 degrees, one by one degree
servo.write(angle); // control servo to go to position in variable 'angle'
delay(10); // waits 10ms for the servo to reach the position
}
}
This Arduino code initializes a servo motor on pin 9 in the setup() function, setting it to 0 degrees at startup. The loop() function then continuously sweeps the servo from 0° to 180° in 1-degree increments with a 10ms delay per step (making the motion slow and smooth), pauses, and then reverses the sweep back from 180° to 0° using the same delay.