NDC 4-20ma board cannot find i2c address

Hardware
1

I bought this board: 2-Channel 4-20 mA Current Loop Receiver 16-Bit ADS1115 I2C Mini Module
https://store.ncd.io/product/2-channel-4-20-ma-current-loop-receiver-16-bit-ads1115-i2c-mini-module/

trying to use it with an ESP32 board. I used this booster between the ESP32 and the NCD board so it would get the 5v required (and confirmed it was getting 5v on the +5v pin and gnd

Adafruit QT 3V to 5V Level Booster Breakout Product ID: 5649 Adafruit QT 3V to 5V Level Booster Breakout - STEMMA QT / Qwiic : ID 5649 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits

when I startup my esp32 I have a scan i2c bus in setup it does not find the device. I also attached another i2c device on the NCD board and it found that. I have tried the pullup and address jumpers on the NCD with no luck (and could not find any doc on them)

ncd i2c
ncd i2c1512Ă—1418 179 KB

, thoughts ?

2

Update, i wired up a uno 5v board and a i2c scan routine , it could find it on x48 or x49 depending on the addr jumper, not sure why the esp32 cannot see this board ?

3

I would be sure to check wiring to SCL and SDA.

4

I have the same problem , used ncd library and adafruit . Esp32 cant see ads1115 … did you end up figuring it out ?

5

can you share the i2c scan code ?

6

Hi Anil,

void setup()
{
Serial.begin(115200);
while (!Serial);

Serial.println(“I2C Scanner”);

Wire.begin();

scanI2C();
}

void loop()
{
}

void scanI2C()
{
byte error, address;
int devices = 0;

Serial.println(“Scanning…”);

for (address = 1; address < 127; address++)
{
Wire.beginTransmission(address);
error = Wire.endTransmission();

if (error == 0)
{
  Serial.print("I2C device found at address 0x");
  if (address < 16)
    Serial.print("0");
  Serial.print(address, HEX);
  Serial.println("  !");

  devices++;
}
else if (error == 4)
{
  Serial.print("Unknown error at address 0x");
  if (address < 16)
    Serial.print("0");
  Serial.println(address, HEX);
}

}

if (devices == 0)
Serial.println(“No I2C devices found\n”);
else
Serial.println(“Scanning finished\n”);
}

7

can you try this


#include <Wire.h>
  byte count = 0;
void scan()
{
  Serial.println ("I2C scanner. Scanning ...");
    for (byte i = 1; i < 120; i++)
  {
    Wire.beginTransmission (i);
    if (Wire.endTransmission () == 0)
      {
      Serial.print ("Found address: ");
      Serial.print (i, DEC);
      Serial.print (" (0x");
      Serial.print (i, HEX);
      Serial.println (")");
      count++;
      delay (1);  
      } 
  } 
  Serial.print ("There is/are ");
  Serial.print (count, DEC);
  Serial.println (" device(s).");
  count=0;
} 

void setup() {
 Serial.begin (9600);
 Serial.println ();
 
  Serial.println ("I2C scanner. Scanning ...");

  
  Wire.begin();
//  for (byte i = 1; i < 120; i++)
//  {
//    Wire.beginTransmission (i);
//    if (Wire.endTransmission () == 0)
//      {
//      Serial.print ("Found address: ");
//      Serial.print (i, DEC);
//      Serial.print (" (0x");
//      Serial.print (i, HEX);
//      Serial.println (")");
//      count++;
//      delay (1);  
//      } 
//  } 
//  Serial.print ("There is/are ");
//  Serial.print (count, DEC);
//  Serial.println (" device(s).");
}  

void loop() {

  scan();
  delay(5000);
    }
8

Hi Anil,
its the same :
I2C scanner. Scanning …

There is/are 0 device(s).

I2C scanner. Scanning …

There is/are 0 device(s).

I2C scanner. Scanning …

There is/are 0 device(s).

I2C scanner. Scanning …

There is/are 0 device(s).

what could it be ?

9

can you attach a picture of your setup here ?

10

20231129_121208
20231129_1212081920Ă—2560 309 KB

I even changed the cabling between the esp32 and the ADC

11

have you tried this i2c board with any other arduino or i2c master device ?

12

Anil, prior to submitting an order i consulted with you guys and i went for the exact recommendation. I presume you test on esp32 you sell …
Do you ?

13

Yes, we do unit testing and ship out each order before testing
This is a straight forward setup and as far hardware connection goes it looks correct

14

Please Anil , Can you do a quick test on same setup i have ( h/w , sfw ) , so i dont waste time and go for extra unecessary orders …

15

@zach test this asap please

1 Like
16

I just tested the same setup here at my desk using my I2C bus scan code. It found the device at address 72 so there are no compatibility issues.

IMG_1597.HEIC
IMG_1597.HEIC3024Ă—4032 3.39 MB

17

Thanks for the test , are you willing to share the scan code ?

18

It is the same SCAN code Bhaskar posted earlier in this thread.

19

@Bhaskar , in this case , can i conclude i ve received a defected board ?

20

@alain.kazan we would be happy to take a look if you would like to send the boards back for evaluation. You can complete an RMA form here: