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+--- Thread: waveshare 10DOF sensor (/showthread.php?tid=3857)
waveshare 10DOF sensor - Newbie1979 - 2022-01-12
Hi All,
I am a newbie to Openplotter and RPI (3b+) and working my way through documentation. After giving up on the GY-91 sensor (they all seem to have some kind of error) I am looking into the waveshare 10DOD sensor. I cannot find the wiring diagram to RPI though. Would anyone point me in the right direction with regards to the setup or advise on a few questions:
1. Any preference or benefit 5 vs 3.3v power feed
2. SDA and SCL pin connections to the RPI are clear, but what about the sensor pins INT and FSYNC? Do they connect to the RPI?
Thank you for your help.
https://www.waveshare.com/10-dof-imu-sensor-c.htm
RE: waveshare 10DOF sensor - Paul M - 2022-01-12
i'm not an expert but I believe you can leave INT and Fsync disconnected (there is a pulldown on the circuit board) as you are not using the SPI interface.
The Raspberry pi PIO is 3.3v max so I would definately power the sensor board (and all I2C sensors) from the 3.3v pin on the GPIO header and never the 5V.
Paul
RE: waveshare 10DOF sensor - seandepagnier - 2022-01-12
generally only connect
3v3
gnd
scl
sda
RE: waveshare 10DOF sensor - Newbie1979 - 2022-01-12
(2022-01-12, 05:09 PM)Paul M Wrote: i'm not an expert but I believe you can leave INT and Fsync disconnected (there is a pulldown on the circuit board) as you are not using the SPI interface.
The Raspberry pi PIO is 3.3v max so I would definately power the sensor board (and all I2C sensors) from the 3.3v pin on the GPIO header and never the 5V.
Paul
Thank you Paul!
RE: waveshare 10DOF sensor - baltika_no_9 - 2022-01-13
“…never the 5V…”. Not necessarily.
The particular sensor the OP is referring to can be powered just fine from a power supply in the range 3.3 to 5.5V It has an onboard regulator to deliver the 3.3V.
RE: waveshare 10DOF sensor - Techstyle - 2022-01-14
(2022-01-13, 09:25 PM)baltika_no_9 Wrote: “…never the 5V…”. Not necessarily.
The particular sensor the OP is referring to can be powered just fine from a power supply in the range 3.3 to 5.5V It has an onboard regulator to deliver the 3.3V.
^correct
RE: waveshare 10DOF sensor - Paul M - 2022-01-14
(2022-01-13, 09:25 PM)baltika_no_9 Wrote: “…never the 5V…”. Not necessarily.
The particular sensor the OP is referring to can be powered just fine from a power supply in the range 3.3 to 5.5V It has an onboard regulator to deliver the 3.3V.
This is certainly true but please take a look at the schematic. https://www.waveshare.com/w/upload/8/86/10-DOF-IMU-Sensor-B-Schematic.pdf
If the 5v supply (vcc) is used the SDA and SDA pins will have pull-ups to the 5v supply which will make them out of spec. for the pi’s gpio pins.
Use the 3.3 volt supply!
Paul
RE: waveshare 10DOF sensor - baltika_no_9 - 2022-01-14
(2022-01-14, 06:17 PM)Paul M Wrote:(2022-01-13, 09:25 PM)baltika_no_9 Wrote: “…never the 5V…”. Not necessarily.
The particular sensor the OP is referring to can be powered just fine from a power supply in the range 3.3 to 5.5V It has an onboard regulator to deliver the 3.3V.
This is certainly true but please take a look at the schematic. https://www.waveshare.com/w/upload/8/86/10-DOF-IMU-Sensor-B-Schematic.pdf
If the 5v supply (vcc) is used the SDA and SDA pins will have pull-ups to the 5v supply which will make them out of spec. for the pi’s gpio pins.
Use the 3.3 volt supply!
Paul
You're quite right Paul, thank you. On that basis then connection to the 3.3V supply has to be the preferred option.
Oddly, for the latest version of that Waveshare device they give an example of how to connect it to the PI and that clearly shows power being provided by the 5V line! https://www.waveshare.com/wiki/10_DOF_IMU_Sensor_(D)
See under the Raspberry Pi Guides tab.
Although it's a slightly different device there are still pull ups to Vcc as is the case for the one we were originally talking about.
How odd
All the best