# How to calculate the power consumption of an ultrasonic distance sensor?

I’m working on a project that will be using an ultrasonic distance sensor continuously throughout the day. I want to figure out what the theoretical power consumption would be over a number of hours in order to help me determine the necessary battery capacity for allowing the system to operate all day.

What information from the data sheet do I need to calculate this? What formula(s) do I need?

• Do you have a specific sensor in mind, or are you asking about any sensor you might pick?
– Null
Commented Sep 23, 2021 at 14:33
• Have a look at the typical curret ratings for given supply voltages. either these values are mentioned in tables or charts. Commented Sep 23, 2021 at 14:38
• We haven’t narrowed down the specific sensor just yet. I was hoping to factor the power consumption in to our decision. Commented Sep 23, 2021 at 14:53
• Is the device a transducer that you will integrate with your electronics or a COTS system (transducer plus necessary electronics)? In the end, you need to know the principles of integration.
– qrk
Commented Sep 23, 2021 at 19:12

Perhaps it is not the power consumption of the component that is important, but rather that of the entire measuring device, which is battery-operated. The frequency and duration of the measurement are also decisive. Find out how many watt seconds a measurement takes. Formula $$\ W = U*I*t\$$ then you can also estimate how long a battery will last. A 6LR61 (9V block alkaline) has about 320Ws until it is empty.