Update: Solved! It was a dodgy solder, always check hardware with multimeter first! Going to leave this here incase anyone has a similar question.
Hi I am using the Arduino Mega and the SM9333 Series Differential Pressure Sensor, see data sheet here https://www.mouser.ie/datasheet/2/589/Datasheet_SM9333_SM9336-1317493.pdf
Essentially I used the I2C Scanner (below), and I cannot find the device, I have no indication whether the device is working or not at all.
I soldered the pressure sensor to a SOIC 16 breakout conversion piece and then connected to my Arduino.
Arduino > Pressure Sensor
3.3v > Vdd
Gnd > Vss
Gnd > Asic Test Pin
SCL > SCL
SDA > SDA
I have tried using 4.7k pull up resistors and without. As Arduino has internal pull up resistors for I2c Devices.
Without the pull up resistor, I am reading a voltage difference of 4.9 v between each of the SCL/SDA Pins and ground, I would have expected this to be lower as the Vdd is only 3.3v, I am not sure if this is a clue?
With the pull up resistors, the voltage input pin on the sensor side is just pulled up to 4.9v.
Is there any way I can test to see if the device is broken or am I doing something wrong? The sensor is relatively expensive, which is why I dont want to buy another one to test it.
// --------------------------------------
// i2c_scanner
//
// Version 1
// This program (or code that looks like it)
// can be found in many places.
// For example on the Arduino.cc forum.
// The original author is not know.
// Version 2, Juni 2012, Using Arduino 1.0.1
// Adapted to be as simple as possible by Arduino.cc user Krodal
// Version 3, Feb 26 2013
// V3 by louarnold
// Version 4, March 3, 2013, Using Arduino 1.0.3
// by Arduino.cc user Krodal.
// Changes by louarnold removed.
// Scanning addresses changed from 0...127 to 1...119,
// according to the i2c scanner by Nick Gammon
// https://www.gammon.com.au/forum/?id=10896
// Version 5, March 28, 2013
// As version 4, but address scans now to 127.
// A sensor seems to use address 120.
// Version 6, November 27, 2015.
// Added waiting for the Leonardo serial communication.
//
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
//
#include <Wire.h>
void setup() {
Wire.begin();
Serial.begin(9600);
while (!Serial); // Leonardo: wait for serial monitor
Serial.println("\nI2C Scanner");
}
void loop() {
int nDevices = 0;
Serial.println("Scanning...");
for (byte address = 1; address < 127; ++address) {
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
byte 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(" !");
++nDevices;
} else if (error == 4) {
Serial.print("Unknown error at address 0x");
if (address < 16) {
Serial.print("0");
}
Serial.println(address, HEX);
}
}
if (nDevices == 0) {
Serial.println("No I2C devices found\n");
} else {
Serial.println("done\n");
}
delay(5000); // Wait 5 seconds for next scan
}