Trying to use the LPS28DWF baro sensor… have it wired up via a level shifter as my Arduino is 5 volt. The Example1_BasicReadings.ino code does not find the sensor on either address. After much looking at the wiring I loaded an i2c device scan sketch. I find the device at 0x18 !!! I confirmed that by plugging in an LCD display (found at 0x28), disconnecting and plugging my sensor board back in. Yup 0x18. Trying to use 0x18 however … it doesn’t respond to the begin Example1_BasicReadings.ino code. The begin returns -1 Ideas? Defective?
What is the serial monitor printing out? SparkFun Absolute Digital Barometer - LPS28DFW (Qwiic) Hookup Guide - SparkFun Learn
Share a photo of the setup/wiring…also, did the LCD utilize the level shifter too?
The LCD is not utilizing the level shifter.
The PWR LED is lit on the Baro board.
output of serial monitor using the Example 1 Basic Readings Sketch, default and secondary addresses give same output:
07:53:31.591 → LPS28DFW Example 1 - Basic Readings!
07:53:31.624 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:34.605 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:37.620 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:40.603 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:43.620 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:46.634 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:49.617 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:52.633 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:55.616 → Error: LPS28DFW not connected, check wiring and I2C address!
07:53:58.633 → Error: LPS28DFW not connected, check wiring and I2C address!
07:54:01.615 → Error: LPS28DFW not connected, check wiring and I2C address!
07:54:04.630 → Error: LPS28DFW not connected, check wiring and I2C address!
Level shifter to Arduino wiring:
Black-> GND
Orange → 3V
Red → 5V
Yellow → A4
Blue → A5
Arduino is Adafruit Metro Mini
On many level shifters the LV is also in INPUT for 3v3, not an output. Can you check yours ?
I have 3V from my arduino feeding the Baro (orange wire). Then jumper from that same pad to the level shifter (white wire) LV.
You don’t have a LPS28DFW, you have a MPRLS0025PA00001A.
Might check out the guide here, this explains why the I2C address is wrong.
1 Like
Ha! That’ll do it. Two different boards, that at first (and second) glance look identical. Thanks!
Yeah, got me too! Wasn’t until I started looking through the documents for the reset pin that I figured it out.
Issue solved. Case Closed.