Dobrica Pavlinušić's random unstructured stuff: accelerometer
https://saturn.ffzg.hr/rot13/
2021-01-12T14:10:18Z
accelerometer
<div>Creator: Dobrica Pavlinušić</div><hr/><div class="wiki">
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Contents: [Dobrica Pavlinušić's random unstructured stuff]
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<li><span class="nlw_phrase"><a title="section link" href="https://saturn.ffzg.hr/rot13/index.cgi?dobrica_pavlinu%C5%A1i%C4%87_s_random_unstructured_stuff#adxl335">Dobrica Pavlinušić's random unstructured stuff (ADXL335)</a><!-- wiki: {link: [Dobrica Pavlinušić's random unstructured stuff] ADXL335} --></span></li>
<li><span class="nlw_phrase"><a title="section link" href="https://saturn.ffzg.hr/rot13/index.cgi?dobrica_pavlinu%C5%A1i%C4%87_s_random_unstructured_stuff#mpu_9250">Dobrica Pavlinušić's random unstructured stuff (MPU-9250)</a><!-- wiki: {link: [Dobrica Pavlinušić's random unstructured stuff] MPU-=9250} --></span></li>
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This page tries to document my experiments using accelerometers</p>
<h1 id="adxl335">ADXL335</h1>
<p>
Board: GY-61.</p>
<p>
ADXL335 3-axis Accelerometer<br />
On-board 3.3V Voltage Regulator<br />
Analog voltage output centered at 1.65V<br />
Suitable for connection to 5V and 3.3V systems</p>
<p>
Supply Voltage: 3V - 5V<br />
Full scale range: +/-3g<br />
Sensitivity: 300mV/g (Typ)</p>
<h1 id="mpu_9250">MPU-9250</h1>
<p>
Board: Grove - IMU 10DOF v1.1</p>
<p>
<a target="_blank" title="(external link)" href="https://wiki.seeedstudio.com/Grove-IMU_10DOF/">https://wiki.seeedstudio.com/Grove-IMU_10DOF/</a></p>
<span class="nlw_phrase"><a href="https://saturn.ffzg.hr/rot13/index.cgi/Grove%20-%20IMU%2010DOF%20v1.1.pdf?action=attachments_download;page_name=accelerometer;id=20210109121050-0-17173">Grove - IMU 10DOF v1.1.pdf</a><!-- wiki: {file: Grove -= IMU 10DOF v1.1.pdf} --></span><br /><br /><p>
MPU-9250 addr: 0x68<br />
BMP180 addr: 0x77</p>
<p>
This board has 5V -> 3V3 level shifter but works with 3V3 as VCC</p>
<pre>
root@rpi4:~# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77
root@rpi4:~# modprobe configs
root@rpi4:~# zgrep INV /proc/config.gz
CONFIG_INV_MPU6050_IIO=m
CONFIG_INV_MPU6050_I2C=m
# CONFIG_INV_MPU6050_SPI is not set
root@rpi4:~# modprobe inv-mpu6050-i2c
root@rpi4:~# echo mpu9250 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
[Sat Jan 9 14:10:25 2021] inv-mpu6050-i2c 1-0068: mounting matrix not found: using identity...
[Sat Jan 9 14:10:25 2021] inv-mpu6050-i2c 1-0068: 1-0068 supply vddio not found, using dummy regulator
[Sat Jan 9 14:10:25 2021] inv-mpu6050-i2c 1-0068: trigger probe fail -22
[Sat Jan 9 14:10:25 2021] inv-mpu6050-i2c: probe of 1-0068 failed with error -22
[Sat Jan 9 14:10:25 2021] i2c i2c-1: new_device: Instantiated device mpu9250 at 0x68
root@rpi4:~# echo bmp180 0x77 > /sys/class/i2c-adapter/i2c-1/new_device
[Sat Jan 9 14:12:17 2021] i2c i2c-1: new_device: Instantiated device bmp180 at 0x77
[Sat Jan 9 14:12:17 2021] bmp280 1-0077: 1-0077 supply vddd not found, using dummy regulator
[Sat Jan 9 14:12:17 2021] bmp280 1-0077: 1-0077 supply vdda not found, using dummy regulator
[Sat Jan 9 14:12:17 2021] bmp280 1-0077: non-rising trigger given for EOC interrupt, trying to enforce it
[Sat Jan 9 14:12:17 2021] bmp280 1-0077: unable to request DRDY IRQ
root@rpi4:~# iio_info
Library version: 0.16 (git tag: v0.16)
Compiled with backends: local xml ip usb serial
IIO context created with local backend.
Backend version: 0.16 (git tag: v0.16)
Backend description string: Linux rpi4 5.4.79-v7l+ #1373 SMP Mon Nov 23 13:27:40 GMT 2020 armv7l
IIO context has 1 attributes:
local,kernel: 5.4.79-v7l+
IIO context has 1 devices:
iio:device0: bmp180
2 channels found:
pressure: (input)
3 channel-specific attributes found:
attr 0: input value: 100.646000000
attr 1: oversampling_ratio value: 8
attr 2: oversampling_ratio_available value: 1 2 4 8
temp: (input)
3 channel-specific attributes found:
attr 0: input value: 24800
attr 1: oversampling_ratio value: 1
attr 2: oversampling_ratio_available value: 1
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<br /><p>
Hm. bmp180 works, mpu9250 doesn't</p>
<p>
It needs full device tree overlay <a target="_blank" title="(external link)" href="https://github.com/dpavlin/linux-gpio-pinout/blob/master/device-tree/grove-imu10dof.dts">https://github.com/dpavlin/linux-gpio-pinout/blob/master/device-tree/grove-imu10dof.dts</a></p>
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<hr/><div>Attachments: Grove - IMU 10DOF v1.1.pdf</div>
https://saturn.ffzg.hr/rot13/index.cgi?accelerometer
Dobrica Pavlinušić
2021-01-12T14:10:18Z