AN-CM-261 Overweight Indicator
■This application note introduces the implementation of a load cell to indicate overweight. It was based on the Wheatstone bridge network principle. This overweight indicator can be used in multiple applications such as airline baggage limit, elevator capacity, etc. In this app note we will use strain gauges as the weight sensor, SLG88104 as differential amplifier, and SLG46140V GreenPAK as ADC and signal conditioning. If the weight is over 60 Kg, SLG46140V will sound an alarm with 1Hz frequency.
■This application note comes complete with design files which can be found in the References section.
●Introduction
■The main goal of this application is to measure the weight of an object then indicate with an alarm sound in case of overweight. Input of the system comes from a load cell. Input is an analog signal that has been amplified by a differential amplifier. The analog signal is converted to a digital signal using an ADC. The value of the ADC reading result is then compared to a certain value that is set so that it represents the desired load limit. If an overweight occurs, then the alert turns on with a frequency of 1 Hz. In this app note, we will use a strain gauge as the weight sensor, SLG88104 as the differential amplifier, and SLG46140V as ADC and signal conditioning. The system can be proven by applying a load exceeding the desired load limit (60 Kg). System functionality is correct if at that condition the alarm is on with a frequency of 1Hz.
■The key advantages of designing with GreenPAK is that the product is smaller, lower cost, simpler, and easy to develop. GreenPAK has a simple GUI interface in GreenPAKDesigner, allowing engineers to quickly and easily implement new designs and respond to changing design requirements. If we want to develop it further, this solution is an excellent choice. Using GreenPAK makes this design very simple, light weight, and only a small area occupied to implement it on most applications. Because of the internal circuit resources available within GreenPAK, this design can be enhanced with more features without having to add too many additional IC’s. To verify the functionality of this system, we just need to implement the circuit designed with the GreenPAK simulation tool.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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14-Nov-2018 |
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Revision 1.0 |
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AN-CM-261 |
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1.4 MB |
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