There are solutions out there that would be single chip -
Weighing Scale Design: Using PSoC5LP
Hi all, Following is a PSoC 5 based load cell measurement system. The project attachment contains Weighing Scale Example and Bridge Sensor Example in the workspace. The Weighing Scale example provides a complete code to measure the weight using a load cell and display the results on an LCD...community.cypress.com
This was done using Correlated Double Sampling. Note DelSig was only
used at 12 bits, but is capable of 20 bits. Also most of chips resources
went unused, available for other tasks, see right hand window. Chip also
has DSP that can be used for any additional filtering needed.
View attachment 167151
Board to do this - https://www.cypress.com/documentation/development-kitsboards/psoc-5lp-development-kits
CY8CKIT-059
Compiler and IDE free - https://www.cypress.com/products/psoc-creator-integrated-design-environment-ide
Regards, Dana.
Did you do some basic calculations?come with sensitivity of 1 mV / gram.
Hi,
Did you do some basic calculations?
1mV/ gram * 10kg = 10V. Is this useful for PIC input?
10bits resolution is 1024 steps.
10kg / 1024 = about 10g step size. Is this useful resolution for a kitchen weigh?
Klaus
According to datasheets available for this half bridge load cell, the sensitivity is about 1 mV/V for rated load of 50 kg. Respectively it can't be used without a high gain differential amplifier.
With a bridge supply voltage of 5V, you get 5 mV output for full scale load of 50 kg. Or 1 mV for 10 kg.
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No load offset is however +/- 0.5 mV. To allow offset zeroing in software, you want some extra ADC resolution.
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