Reading Analog input from AD620AN , output misbehaving on Serial monitor

Other Hardware Sensors
1

Hey,

I am using load cell(200kg) connected with AD620AN(load cell amplifier). I am getting proper output on of amplifile(checked by multi meter). When i am reading this value from arduino UNO analog pin(A0, A1). Serial monitor is giving some different data.

Please find screen shot of output.

also find the code i am using.

#include <XBee.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3); // RX, TX
XBee xbee = XBee();

uint8_t payload[] = { 0, 0 };

// SH + SL Address of receiving XBee
XBeeAddress64 addr64 = XBeeAddress64(0x0013A200, 0x40DC8215);
ZBTxRequest zbTx = ZBTxRequest(addr64, payload, sizeof(payload));
ZBTxStatusResponse txStatus = ZBTxStatusResponse();

int offset1=0;
int offset2=0;
int L1,L2,L3 = 0; //
int statusLed = 13;
int errorLed = 13;

void flashLed(int pin, int times, int wait) {

for (int i = 0; i < times; i++) {
digitalWrite(pin, HIGH);
delay(wait);
digitalWrite(pin, LOW);

if (i + 1 < times) {
delay(wait);
}
}
}
void setup() {
pinMode(statusLed, OUTPUT);
pinMode(errorLed, OUTPUT);

Serial.begin(115200);
mySerial.begin(115200);
xbee.setSerial(mySerial);

}

void loop() {
// put your main code here, to run repeatedly:
String dataString;
L1=analogRead(0);
L2=analogRead(1);

dataString= String(L1)+","+String(L2)+";";
float weight = ((L1-offset1)+(L2-offset2))/2.3;
Serial.println(dataString);

payload[0] = int(weight) >> 8 & 0xff;
payload[1] = int(weight) & 0xff;

xbee.send(zbTx);

// flash TX indicator
flashLed(statusLed, 1, 50);
delay(500);

}

load.png
load.png1366×768 167 KB

2 
mySerial.begin(115200);

I never seen anything above 19200 baud to work reliably on a SoftwareSerial but it's good to block the Arduino do the rest very badly (it blocks interrupts during sending and receiving and interrupts are necessary for a lot of things in the Arduino platform).

Test your stuff without SoftwareSerial and if everything works connect the XBee to the hardware serial interface.

3

Thanks for your replay,

My "AD620" IC (pin number 6 output with respect to ground of arduno) is constantly 90 mV without load on loadcell. when i am putting load on loadcell the output of AD620 is amplified to around 250 mV.

Please find the circuit diagram attached.

I am unable to understand why me serial monitor is showing this output.

IMG_20170402_195547.jpg
IMG_20170402_195547.jpg3120×4160 1.17 MB

4

I am unable to understand why me serial monitor is showing this output.

You still didn't tell us what output you get nor what you expect.