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Wireless Digital Scale This scale is wireless. It may be useful where you can’t operate a normal scale, due to the weather outside, or if you don’t want to scare birds or other creatures away. With this scale you can weigh them. In this instructable, I used a 0 to 1 Kg load cell since I wanted to weigh hummingbirds and orioles that visited our nectar feeder. One end of the load cell was attached to the eaves, and the other end has a hook from which the support string for the feeder hangs. Many other load cells are available in different weight ranges, and they all can be hooked up the same way, the only difference being the zero factor and range factor which can be changed in the Arduino sketch. Supplies Required The parts are all very low cost, but will take 4 to 5 weeks to arrive from China. The display module contains: ATTiny85 micro controller ATtiny85 2 ea.

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The raw data can be seen here but you can view some prettier graphs of the data here on analog. On a visit to Portland, Oregon, last summer my friend mentioned he had always wanted to put a load cell under a beehive to measure the weight of the hive over time. He thought it was a great project for SparkFun and I immediately started thinking how it might be done.

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Sorry about the vacancy. Hadn’t seen any posts pop up in ages, and forgot this was here until Ribcage sent me a message. I have made a lot of headway since this thread so I guess I can give my insights and updates as to what I have done. And where I am. Now, I understand and totally agree that I won’t be walking straight into an Operator’s Job. It is no longer a long Wait List, it is now based on merit and previous experience.

Now the entrance to enroll in the Cert II is based on relevant industry experience or at least a trade. Someone with minimal experience or none, does not get them cash. It is not the same as the Cert II, so you need to be employed as an Operator to enroll in those courses. The tickets I found to be me more desirable to gain employment were: Get to work, show the company I am committed, and work my way up from the mailroom so to speak.

Wireless Digital Scale

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Chevron’s Wheatstone project faces 6-month delay

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Some of the test and monitoring equipment for the military was the best that could be produced at the time and no expense was spared in its construction. At the budget-built end, there were the countless test-gadgets intended for radio repairmen or radio hobbyists that might seem to barely be able to perform the intended task but clever designs sometimes resulted in very useful test instruments. Biddle of Philadelphia imported these instruments and each box has his tag attached.

Biddle was also a very early major builder and supplier of wireless equipment with Reginald Fessenden being one of his prominent customers over a long period of time. At the turn of the last century, many precision measurements had to be calculated because the measurement couldn’t be made directly since many of the instruments we take for granted today hadn’t been developed. A known precision resistance allowed one part of the equation to be selected and the remainder was then calculated.

These types of boxes were used in DC Resistance bridge circuits for precise measurements of an unknown resistance Wheatstone Bridge circuits or in other circuits for calculating current flow, low voltage levels or comparison evaluations. Many experiments were carried out at Mt. Wilson and the facility there had has a lot of very early test gear. I was given these boxes by my old Virginia City friend, Maynard Clark who worked at Mount Wilson Observatory Maynard designed much of the computer software for the various telescope drive systems at Mt.

Biddle Company – “JAGABI” Adjustable Slide Rheostat-Potentiometer These large, adjustable wire-wound rheostat-potentiometers were generally used in college and university physics laboratories when performing experiments in electricity where fairly large currents were involved. Most of these types of devices used nickel-chromium wire wound on ceramic forms. All of these rheostats will have a slide adjustment to vary the value of resistance or voltage when connected as a potentiometer as necessary for the experiment.

How does an op amp work? How do I use an op amp? — Part 1

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You have got to have a nice, well calibrated variable resistance on the opposite side to the unknown resistance. The accuracy with which you can judge the unknown is limited by the calibration accuracy of the variable resistance. Using Ohm’s law to find an unknown resistance is a great way to do it. You just match the voltage you apply to the unknown based on the range of resistance you expect to encounter.

Suppose you had a short piece of heavy copper buss bar you wanted to measure the resistance of. I have a nice AC welder that can put out amps for brief periods. I will short the output with the buss bar, put amps to it and while the current is flowing, I will measure the voltage difference between each end of the bar.

With such a small resistance in the unknown resistor, it takes a lot of amps to generate a nice measurable voltage. Conversely, the mega high resistance of thick layers of insulation can be measured by putting a couple of tens of kilovolts to it and reading the milliamperage. I use neon sign transformers and large resistor banks for stepping down and for amp measurements. I have a series of calibrated shunts that are useful. They run a millivolt per amp.

I have a big brass shunt on my car dash that gives me a reading of starting amps. I ran old welding cable to bring the starter amps into the passenger compartment.

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How does an op amp work? How do I use an op amp? How do I use an op amp These are questions that I have asked at two periods in my life. The second time was when I dove headfirst back into analog electronics for my new job and had to re-teach myself a lot of things. I really appreciate the opportunity I had to re-learn everything because the second time around, I think I got it right. What is an op amp?

This symbol is an IDEAL op-amp, meaning it is impossible to construct one and really the expectations for the op amp are unrealistic. Inverting Ideal Op-amp OK, so now you know what the symbol is, but what does it mean? Well, the idea is you put two electrical signals into the inputs then the output changes accordingly.

It takes the difference between the inputs and amplifies it, hence operational amplifier, or op amp. You may have noticed that input A has a minus symbol and input B has a plus symbol. Now the op-amp is in an unbalanced state. The device is designed so that when this happens, the output goes as negative as it can. More on that later.

Wheatstone Australian Project Facing Delays

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Learn how the device works here. One is connected to the body whose temperature is to be measured; this is the hot or measuring junction. The other junction is connected to a body of known temperature; this is the cold or reference junction. Therefore the thermocouple measures unknown temperature of the body with reference to the known temperature of the other body.

They are as follows: The Seebeck effect states that when two different or unlike metals are joined together at two junctions, an electromotive force emf is generated at the two junctions. The amount of emf generated is different for different combinations of the metals. As per the Peltier effect, when two dissimilar metals are joined together to form two junctions, emf is generated within the circuit due to the different temperatures of the two junctions of the circuit.

As per the Thomson effect, when two unlike metals are joined together forming two junctions, the potential exists within the circuit due to temperature gradient along the entire length of the conductors within the circuit. In most of the cases the emf suggested by the Thomson effect is very small and it can be neglected by making proper selection of the metals. The Peltier effect plays a prominent role in the working principle of the thermocouple.

Telegraphy

Thermocouples Chapter 9 – Electrical Instrumentation Signals An interesting phenomenon applied in the field of instrumentation is the Seebeck effect, which is the production of a small voltage across the length of a wire due to a difference in temperature along that wire. This effect is most easily observed and applied with a junction of two dissimilar metals in contact, each metal producing a different Seebeck voltage along its length, which translates to a voltage between the two unjoined wire ends.

Most any pair of dissimilar metals will produce a measurable voltage when their junction is heated, some combinations of metals producing more voltage per degree of temperature than others: The Seebeck effect is fairly linear; that is, the voltage produced by a heated junction of two wires is directly proportional to the temperature. This means that the temperature of the metal wire junction can be determined by measuring the voltage produced. Thus, the Seebeck effect provides for us an electric method of temperature measurement.

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RTDs are sometimes referred to generally as resistance thermometers. In practice, an electrical current is transmitted through a piece of metal the RTD element or resistor located in proximity to the area where temperature is to be measured. The resistance value of the RTD element is then measured by an instrument. This resistance value is then correlated to temperature based upon the known resistance characteristics of the RTD element.

How do RTDs Work? RTDs work on a basic correlation between metals and temperature. As the temperature of a metal increases, the metal’s resistance to the flow of electricity increases. Platinum is the most commonly used metal for RTD elements due to a number of factors, including its 1 chemical inertness, 2 nearly linear temperature versus resistance relationship, 3 temperature coefficient of resistance that is large enough to give readily measurable resistance changes with temperature and 4 stability in that its temperature resistance does not drastically change with time.

Other metals that are less frequently used as the resistor elements in an RTD include nickel, copper and Balco.

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