I received an Adafruit ADS1115 I2C 16-Bit ADC the other day. I soldered a header to it and tried to get it hooked up to my Raspberry Pi the other day. I used the Linux "i2cdetect" command line tool, but I couldn't get an address to appear. I tried troubleshooting the bus, eventually trying just the ADS1115 on the bus, but could never get anything to appear.
I assumed that I didn't solder something correctly. I took a look at the joints today and they look to be intact.
However, on closer inspection, it looks like the main chip is soldered askew. It also appears that the SMD component directly inline with the "GND" label is not completely soldered. The little chip only appears to be soldered on one side. On the product page, the main chip looks to be soldered square to the board. This one looks like it is definitely skewed (it appears to have an extra leg).
I'm not sure I'm ready for SMD soldering. Well, I'm working on it, but I'd like to do it with a project that I know how it works, first. With this, if I mess with it, and it still doesn't work, I'm not going to know if it is my technique or not.