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Its a full bridge strain gauge, so power goes to Red and Black,
Green and White to A/D or IA input.
The lower R valued ones may need a R in series with power connection
to limit current, which creates a CM Voltage so A/D has to be differential
input, or use IA. Does information describe current limit allowed, max ?
Regards, Dana.
Green and White to A/D or IA input.
The lower R valued ones may need a R in series with power connection
to limit current, which creates a CM Voltage so A/D has to be differential
input, or use IA. Does information describe current limit allowed, max ?
Regards, Dana.
yes i have AD620 module too amplify it , the vender told me 25mA.how much safe power supply should give and how can i connect this with breadboard
Edit: do i need voltage divider , i have voltage regular 3-24V DC
thankyou very much
Last edited:
A good starting point would be Fig 38 in :
Regards, Dana.
Regards, Dana.
i understang this Amp , i want to know that how should i suppl power
What A/D are you going to use to read the output of AD620 ?
In other words what is the desired output range you want out
of the AD620 ?
Will you be feeding the AD620 output to an A/D, if so whats is
its input range allowed ?
Regards, Dana.
In other words what is the desired output range you want out
of the AD620 ?
Will you be feeding the AD620 output to an A/D, if so whats is
its input range allowed ?
Regards, Dana.
the mv voltage from AD620will be feed into Arduino , the voltage allowed output from AD620 is 9V .
Tha allowed Arduino input range is 0 - Vcc, Vcc is either 3.3 or 5V.
So you cannot overdrive the input. Circuits you can use to accomplish this :
electronics.stackexchange.com
The Ad620 has to be operated at higher V than Arduino Vcc if you want maximum range, becuse its limited,
not rail to rail :
Regards, Dana.
So you cannot overdrive the input. Circuits you can use to accomplish this :
How would I design a protection clipper circuit for ADC input?
I'd like to be able to protect my ADC from input voltages higher than 5V. What's the simplest protection circuit I could build to have an output like shown below?
The Ad620 has to be operated at higher V than Arduino Vcc if you want maximum range, becuse its limited,
not rail to rail :
Regards, Dana.
if i supply 3-5 V to AD620 , will it will be enough ? secondly i want to know that how can i suppl power to 4 strain gauge full bridge if wheatstone bridge not requiredTha allowed Arduino input range is 0 - Vcc, Vcc is either 3.3 or 5V.
So you cannot overdrive the input. Circuits you can use to accomplish this :
How would I design a protection clipper circuit for ADC input?
I'd like to be able to protect my ADC from input voltages higher than 5V. What's the simplest protection circuit I could build to have an output like shown below?
The Ad620 has to be operated at higher V than Arduino Vcc if you want maximum range, becuse its limited,
not rail to rail :
View attachment 60410
Regards, Dana.
Attachments
Hello,
It looks like it uses a ICL7660 as voltage converter for the negative voltage:
protosupplies.com
Bertus
It looks like it uses a ICL7660 as voltage converter for the negative voltage:
AD620 Instrumentation Amplifier Module - ProtoSupplies
The AD620 instrumentation amplifier module provides a platform for amplification of small AC or DC signals such as from analog sensors.
protosupplies.com
Bertus
so i should supply 3.5-10V to AD620?Hello,
It looks like it uses a ICL7660 as voltage converter for the negative voltage:
View attachment 60415
AD620 Instrumentation Amplifier Module - ProtoSupplies
The AD620 instrumentation amplifier module provides a platform for amplification of small AC or DC signals such as from analog sensors.
Bertus
The gauge circuit is driving the ground, in this case, of the Arduino which would
pose additional problems interfacing to it.
You have a bridge, connected to Vcc, lets say 5V. Its CM V is 2.5V. Its deviation
you have to compute, but for this example, when bridge unbalanced ranges
+/- 100 mV. So its output ranges from 2.6V to 2.4V.
Your arduino, says its running off 5V, the A/D input range is 0 - 5V.
So you have to translate 2.4V to 2.6 V to 0 V to 5.0 V. So start with G needed.
G = 5V / .2V = 25. So that gives you the slope of Vout / Vin.
Now you have to offset that by the CM voltage of 2.5 V so you get 0 - 5 V.
The easy way is to have a - supply as well on AD620 and use a OpAmp
differential circuit to subtract out the offset. A tool you can play with :
tools.analog.com
A design method for offset OpAmp is :
Of course you dont have to use the entire range of Arduino A/D, you can
trade that off for other considerations.
For negative supply you can use PWM output of Arduino and this :
www.allaboutcircuits.com
Because the AD620 has excellent PSRR that should be OK, but doing an error buget or
sim always prudent.
Regards, Dana.
pose additional problems interfacing to it.
You have a bridge, connected to Vcc, lets say 5V. Its CM V is 2.5V. Its deviation
you have to compute, but for this example, when bridge unbalanced ranges
+/- 100 mV. So its output ranges from 2.6V to 2.4V.
Your arduino, says its running off 5V, the A/D input range is 0 - 5V.
So you have to translate 2.4V to 2.6 V to 0 V to 5.0 V. So start with G needed.
G = 5V / .2V = 25. So that gives you the slope of Vout / Vin.
Now you have to offset that by the CM voltage of 2.5 V so you get 0 - 5 V.
The easy way is to have a - supply as well on AD620 and use a OpAmp
differential circuit to subtract out the offset. A tool you can play with :
Instrumentation Amplifier Diamond Plot Tool | Analog Devices
Generate Common-Mode Voltage vs. Output Voltage (aka Diamond) plots, using your design criteria. Select your preferred In-Amp from a list of devices that will meet your signal range requirements.
tools.analog.com
A design method for offset OpAmp is :
Of course you dont have to use the entire range of Arduino A/D, you can
trade that off for other considerations.
For negative supply you can use PWM output of Arduino and this :
Build Your Own Negative Voltage Generator - Projects
Everyone needs a negative voltage rail eventually, but most only have a single rail supply. This project will show you how to build a negative voltage generator that runs off a single rail supply!
Because the AD620 has excellent PSRR that should be OK, but doing an error buget or
sim always prudent.
Regards, Dana.
Last edited:
Sim for -V generator, you will have to juggle values to get AD620 output
swing down to 0V (to maximize Arduino A/D input range). Also use Schottky
diodes versus the Si I used, to get more - V. Basically strive for
~ 2V so that AD620 can swing to ground. Note using Schottky's versus IN914
should get closer to -2V needed.
I ran Arduino PWM at 1 Khz.....to drive this neg V generator.
Regards, Dana.
Last edited:
for this Fully strain gauge bridge how can i power it up , there are four terminals , two terminal S+ and S- go to AD620 signal + and signal -
i have question that the Module i have , do i need to make another OP and connect AD620 MOdule with it ?The gauge circuit is driving the ground, in this case, of the Arduino which would
pose additional problems interfacing to it.
You have a bridge, connected to Vcc, lets say 5V. Its CM V is 2.5V. Its deviation
you have to compute, but for this example, when bridge unbalanced ranges
+/- 100 mV. So its output ranges from 2.6V to 2.4V.
Your arduino, says its running off 5V, the A/D input range is 0 - 5V.
So you have to translate 2.4V to 2.6 V to 0 V to 5.0 V. So start with G needed.
G = 5V / .2V = 25. So that gives you the slope of Vout / Vin.
Now you have to offset that by the CM voltage of 2.5 V so you get 0 - 5 V.
The easy way is to have a - supply as well on AD620 and use a OpAmp
differential circuit to subtract out the offset. A tool you can play with :
Instrumentation Amplifier Diamond Plot Tool | Analog Devices
Generate Common-Mode Voltage vs. Output Voltage (aka Diamond) plots, using your design criteria. Select your preferred In-Amp from a list of devices that will meet your signal range requirements.
A design method for offset OpAmp is :
Of course you dont have to use the entire range of Arduino A/D, you can
trade that off for other considerations.
For negative supply you can use PWM output of Arduino and this :
Build Your Own Negative Voltage Generator - Projects
Everyone needs a negative voltage rail eventually, but most only have a single rail supply. This project will show you how to build a negative voltage generator that runs off a single rail supply!
View attachment 60416
Because the AD620 has excellent PSRR that should be OK, but doing an error buget or
sim always prudent.
Regards, Dana.
the company said that , the working current during static measurement is about 25mA , unfortunately could not find datasheet
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