HELP NEEDED! TWI_Scanner not finding MS5837

RE: HELP NEEDED! TWI_Scanner not finding MS5837

Kenneth — Mon, 20 Sep 2021 07:13:43 GMT

We need a logic analyzer trace to get further.

Kenneth

RE: HELP NEEDED! TWI_Scanner not finding MS5837

raydayrayday — Fri, 17 Sep 2021 00:30:08 GMT

We've just tried testing it with the Arduino bootloader and we get a response and readings from the MS5837 sensor however when we try with just the TWI_Scanner in the SDK, we still get no response.

https://github.com/bluerobotics/BlueRobotics_MS5837_Library/blob/master/src/MS5837.cpp

Any ideas?

RE: HELP NEEDED! TWI_Scanner not finding MS5837

raydayrayday — Mon, 13 Sep 2021 22:14:01 GMT

Thanks for the response Kenneth! Very much appreciated, I've been scratching my head on this one for weeks. In response to your questions;

1. Is the breakout board powered with common gnd/vdd as the DK? -> The breakout board is powered by the VDD and GND on the nRF52840 DK.

2. You are sure you have not mixed CLK and DATA? -> Those are the i2c pins, and I think they are correctly connected to the defined i2c pins on the nRF52840 DK. I've tried Pins SDA 27, SCL 28, and on 29, 30, 31..... all with no response.

3. There are pull-up resistors on the TWI pins? -> That's what I'm not sure of, as I don't have the schematic of the breakout board nor can we find one on the internet.

4. Some sensors can be setup to use a different interface, so maybe double check that TWI is selected. -> This sensor is using I2C.

I am also looking to try some pull up resistors on the I2C pins....

RE: HELP NEEDED! TWI_Scanner not finding MS5837

Kenneth — Mon, 13 Sep 2021 12:33:16 GMT

Do you have a logic analyzer trace to monitor the TWI pins? Is the breakout board powered with common gnd/vdd as the DK? You are sure you have not mixed CLK and DATA, and that there are pull-up resistors on the TWI pins? Some sensors can be setup to use a different interface, so maybe double check that TWI is selected.

Kenneth

RE: HELP NEEDED! TWI_Scanner not finding MS5837

raydayrayday — Sun, 12 Sep 2021 04:07:24 GMT

MS5837 datasheet