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load cell amplification using 741 to interface with pic

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raman00084

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my load cell has 4 wires 2 for power supply and 2 for output. i want to amplify the out put signal and interface to pic micro adc. how to do this in ic 741, dual supply is needed are single is enough. kindly post the circuit in op amp 741.



regards
kalyan
 

Hi,

741 is the single useful information here.
But a old, poor performance 741 Opamp will be not the right choice for load cells.

Please give more in formations about your load cell and the signals.

Btw: ther are thousands of load cell circuits around. You surely made your research. What's wrong with them?

Klaus
 

I think you need to use an Instrumentation amplifier for better operation(in case you don't know you can find some info here https://en.wikipedia.org/wiki/Instrumentation_amplifier ),so in case you need a single supply or/and cheaper INA you can either build a one using 3 op amps or look for a one like AD8223 ,AD623, MAX4194 .... etc
 

Use HX711, its low cost and works great, you get direct digital data without messing with analog amplifiers.

https://www.sunrom.com/195



Code: 
sbit AD_DATA_PIN = P1^5; // Pin mapping of microcontroller
sbit AD_SCK_PIN = P0^0; // Pin mapping of microcontroller

unsigned long ReadCount(void)
{
	unsigned long Count;
	unsigned char i;
	AD_SCK_PIN=0; 
	Count=0;
	while(AD_DATA_PIN); 
	for (i=0;i<24;i++)
	{
		AD_SCK_PIN=1;
		Count=Count<<1;
		AD_SCK_PIN=0;
		if(AD_DATA_PIN) Count++;
	}
	AD_SCK_PIN=1;
	Count=Count^0x800000;
	AD_SCK_PIN=0;
	return(Count);
}
 
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