Output devices

Measure the power consumption of an output device.

For this week's group assignment we needed to measure the power consumption of the output device that we were using. For the motor that I used this week I needed to supply 3.3V so when using the power supply machine I also measured what was the power consumption. We tested this when the motor was set to the minimum and maximum to check what was its maximum. In the next two pictures you can see that when the motor was off the power consumption was 0A and when it was on it was 0.08A.

Power consumption when the motor was switched off.
Power consumption when the motor was switched on.
Measuring with the multimeter

We also measured the power consumption of a DC motor using both the power supply and the multimeter. For doing so we have to connect them in the following way:

The GND of the power supply has to be connected to the ground cable of the DC motor. Then we connect the red probe to the current connection, we first started by measuring with the biggest one, the 10A one. It is always bettero to start with the biggest one and then if you see that your consumption is less than that you can chnge to the 500mA max one. This red probe will be connected to the other cable of the motor. Finally, the red probe of the multimeter has to be connected to the VCC of the power supply.

Before connecting everything we made sure that the power supply was stablish to the one we wanted, 5V for the DC motor. Once the whole thing was ready we switched on and we measured the consumption.

In this case the consumption was in 0.10 ams so we could change the multimeter probe to the 500mA position. Then we also changed the A wheel to 200m. By doing this we can be more precise with the measuring. You can see in the next video that it was consuming around 98mA.