Strain gauges need to be part of a bridge circuit. This clip shows how a simple bridge circuit works. I show the equation for output voltage and do an example calculation.
I am not from a one of the circuit branches, however it is so nice that you explain from the basics. It makes it easier for a chemical engineer like myself to apply electrical basics in my work.
Wonderful. I hadn't really thought about it, but I'd be willing to do guest lectures or tutoring if anyone ever asked. No university has ever asked, though.
im building a humanoid robot and im using this as finger tips for end efflector. your formulas should help me on my calculations and predication algorithm for its movement when i do my C++ Classes or function calls
9:38 i was waiting for this part to come up so good, tho you did skip over some very important highlights you brought up such as amplifiers to boost the 1.5mV ? can you elaborate on that aspect of which amplifier are you refereeing name/model number? also it did not pick up clear on what you meant to say when you placed the strain gauge over the wheatstone bridge covering only R1 "what does this mean for the rest of R2 R3 and R4 ? are they still being used at this point?
Frank Lopez they are still being used. In a q bridge circuit they would be fixed resistors with the same resistance as the strain gauge (when un-strained). This makes your single strain gauge the only variable. A change in resistance due to strain unbalances the bridge and produces an output voltage. You can then use the gauge factor and excitation voltage to calculate strain. As long as you know the test materials youngs modulus you can use the strain to calculate stress
I really don't know how they keep the bad profs at my school :( ... I am not saying this as a complement but I really love the way you are teaching. I might propose some of Electrical Engineering topics and I want you to explain them. Is that OK sir?
@purdueMET Will do! P.S your book 'Engineering the Guitar', great too! You should definitely do a youtube video on some of the concepts, excellent job ;)
