Question About AD7705 ADC - Sensors - Arduino Forum

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Question about AD7705 ADC Other Hardware Sensors October 19, 2017, 11:14pm 1

Hi there, I'm a beginner of Arduino and I'm trying to get the 16-bit ADC, AD7705 work with Arduino UNO. I used the AD7705/AD7706 library written by Kerry D. Wong(AD7705/AD7706 Library Revisited – Kerry D. Wong). My connections are:

VDD: 5V on Arduino board GND: GND on Arduino Board Din: D11 on Arduino Board Dout: D12 on Arduino Board SLK: D13 on Arduino Board CS: D10 on Arduino Board

AIN2(+) : connected to the voltage input that I wanna measure.

And My code is:

#include <AD770X.h> AD770X ad7706(2.5); double v; //double v2; void setup() {  Serial.begin(9600);  ad7706.reset();  ad7706.init(AD770X::CHN_AIN1);    //ad7706.init(AD770X::CHN_AIN2); } void loop() {  v = ad7706.readADResult(AD770X::CHN_AIN1);  Serial.print(v);  //v2 = ad7706.readADResult(AD770X::CHN_AIN2);  Serial.print("\n");  //Serial.println(v2);  delay(500); }

My problem is I keep getting 0 from the reading. Can somebody kindly help me on this? Is there some parts that I messed up? Thanks! Ray

October 19, 2017, 11:16pm 2

luxinrui: Is there some parts that I messed up?

Not buying an HX711. :slight_smile: And not posting your code in the code tags </>.

October 19, 2017, 11:29pm 3

Thanks for your reminder I just modified it :slight_smile: But still I only have that AD7705 :cry:

October 20, 2017, 6:02am 4

Judging from the comments on Wong's site, you're not the only one with the "all I get are zeros" problem. One person resolved it by pulling the reset pin high, but that didn't work for others. Worth a shot. If it doesn't work, I'd say ditch it and move on to a different ADC.

October 20, 2017, 7:32am 5

From the code it looks like you read AIN1 while signal is connected to AIN2?

EDIT: it is differential ADC. You need to connect AINx(-) to something, maybe GND (if you are interested in "single-ended" voltage as Arduino measures it).

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