How to Make a Load Cell Amplifier – The SparkFun Load Cell Amplifier helps you to quickly read load cells from an analog input and convert the measured voltage into current with the help of a load cell amplifier. The Load Cell Amplifier allows you to read load cells from a digital input. You just need an adapter to convert the analog signal into a digital one. By connecting the amplifier directly to your microprocessor you can easily read the variations in the load cell’s resistance, and by some simple calibration you will be capable to obtain very accurate current readings. This is very useful for creating your own load cell analog or digital output, process control, or even simple presence detection.
There are two kinds of load cell amplifiers available in the market: constant-varying and variable-varying. The constant-varying is considered the more reliable type as it continuously changes the input voltage to produce output voltage variation as the input load varies. However, when the output load fluctuates, the output may also vary. To prevent this, the variable-varying is used which continuously produces variable load levels as per requirement. Usually, the output voltage is linearly controlled with the help of an output potentiometer and is then amplified through a load cell amplifier. It is then converted into currents by means of a linear amp; thus producing regulated currents.
You can purchase the load cell amplifier and its associated fittings from many online stores at affordable prices. You can even buy them used, but for proper quality it is recommended that you should install it yourself. If you are not very much experienced with electronic gadgets, I recommend that you choose to buy a pre-built amplifier along with its corresponding fuse holders.
This will allow you to reduce the chances of your device getting damaged due to incorrect installation. Alternatively, if you want to save some money, you can visit a local hardware store and ask the assistant to install the amp for you; they will surely charge you less than buying it new.
The Function Of A Load Cell Amplifier And How It Can Be Used
The SparkFun Load Cell Amplifier consists of a tiny breakout board for your HX711 IC that enables you to quickly read load cells from a distance. By connecting the amplifier directly to your microprocessor you will also be able to read the voltage changes in the load cell’s resistance, this will then allow you to easily calculate the resistance value of the load cell. This is useful for creating your own load cell detection, process control or even simple presence detection, all from a distance. This device is ideal for using as an in ground load cell or from an interface with an external meter.
Easier To Detect
The built in load cell amplifier and its built in digital input and analog output enable it to function as both a demodulation device and as a measurement device. The output from the analog input can be calibrated and set to show maximum or minimum values. You can also program the amplifier with the measured signals to display as a percentage or other types of graphs. This device is very easy to use and programming is really simple, all you need to do is connect the probes to the probes of the load cell and program the amp. A great feature of this load cell amplifier is that it also has a user programmable LED screen that makes programming a breeze. The only thing that is not quite optimal about this load cell amplifier is the fact that the signal range is limited to just 40 Ohm, so if you want to use heavier loads you are going to need a different load source.
The Load cell amplifier is made specifically for DC load and has an on board voltage indication LED, but it can also be used with any type of load, it does not matter if the load is placed between the negative and positive terminals of the DC input as the LED display will continue to show on the DC input. The only drawback to the built in load cell amplifier is the fact that it cannot detect larger loads because it can only detect the DC load. If you are going to use this type of load cell amplifier then you need to buy the separate load gauges that are designed to work in conjunction with this type of load cell. Some of these load gauges have separate input and output signals and some even combine the input and output signals into a single signal to make it easier to detect a load.