Need advice on how to add multiplier to scale readout - Electronic Circuits Projects Diagrams Free

darnat46 · 31st August 2009, 03:31 AM

Hello all, I want to build a 1/14th scale semi truck weigh scale. I need a way to make an electronic scale readout multiply the actual model weight by 2500. Example a 1/14th scale loaded model truck which weighs actual 32 lbs to read out as 80,000 and everything in between. 16 lbs would read out as 40,000 etc. Does anyone have any ideas on how I could acomplish this? Thankyou, Darwin

**Nigel Goodwin** · 31st August 2009, 10:07 AM

As it would make sense to be doing this using a microcontroller anyway, just do the multiplication in the software.

bountyhunter · 31st August 2009, 10:01 PM

LED or LCD digital displays are usually built around a full scale reading of 199.9 for an input voltage of 199.9mV. Take whatever signal you have coming from the "weigh circuit" and simply attenuate it with a resistive divider or gain it up using a non-inverting op-amp gain stage so that you get the scale range you want.

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31st August 2009, 03:31 AM	#1
darnat46	Need advice on how to add multiplier to scale readout Hello all, I want to build a 1/14th scale semi truck weigh scale. I need a way to make an electronic scale readout multiply the actual model weight by 2500. Example a 1/14th scale loaded model truck which weighs actual 32 lbs to read out as 80,000 and everything in between. 16 lbs would read out as 40,000 etc. Does anyone have any ideas on how I could acomplish this? Thankyou, Darwin

31st August 2009, 10:07 AM	#2
Nigel Goodwin	As it would make sense to be doing this using a microcontroller anyway, just do the multiplication in the software. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

31st August 2009, 10:01 PM	#3
bountyhunter	LED or LCD digital displays are usually built around a full scale reading of 199.9 for an input voltage of 199.9mV. Take whatever signal you have coming from the "weigh circuit" and simply attenuate it with a resistive divider or gain it up using a non-inverting op-amp gain stage so that you get the scale range you want. Last edited by bountyhunter; 31st August 2009 at 10:02 PM.