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Measuring_Resonances.html

@@ -1542,6 +1542,39 @@ and <strong>will not work</strong>. The recommended connection scheme:</p>
 </tr>
 </tbody>
 </table>
+<p>An alternative to the ADXL345 is the MPU-9250 (or MPU-6050).  This accelerometer has been tested to work over I2C on the RPi at 400kbaud.
+Recommended connection scheme for I2C:</p>
+<table>
+<thead>
+<tr>
+<th align="center">MPU-9250 pin</th>
+<th align="center">RPi pin</th>
+<th align="center">RPi pin name</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td align="center">3V3 (or VCC)</td>
+<td align="center">01</td>
+<td align="center">3.3v DC power</td>
+</tr>
+<tr>
+<td align="center">GND</td>
+<td align="center">09</td>
+<td align="center">Ground</td>
+</tr>
+<tr>
+<td align="center">SDA</td>
+<td align="center">03</td>
+<td align="center">GPIO02 (SDA1)</td>
+</tr>
+<tr>
+<td align="center">SCL</td>
+<td align="center">05</td>
+<td align="center">GPIO03 (SCL1)</td>
+</tr>
+</tbody>
+</table>
 <p>Fritzing wiring diagrams for some of the ADXL345 boards:</p>
 <p><img alt="ADXL345-Rpi" src="img/adxl345-fritzing.png" /></p>
 <p>Double-check your wiring before powering up the Raspberry Pi to prevent
@@ -1583,7 +1616,7 @@ sudo apt install python3-numpy python3-matplotlib
 "linux mcu" on the Raspberry Pi.</p>
 <p>Make sure the Linux SPI driver is enabled by running <code>sudo
 raspi-config</code> and enabling SPI under the "Interfacing options" menu.</p>
-<p>Add the following to the printer.cfg file:</p>
+<p>For the ADXL345, add the following to the printer.cfg file:</p>
 <div class="highlight"><pre><span></span><code>[mcu rpi]
 serial: /tmp/klipper_host_mcu
 
@@ -1598,6 +1631,20 @@ probe_points:
 
 <p>It is advised to start with 1 probe point, in the middle of the print bed,
 slightly above it.</p>
+<p>For the MPU-9250:</p>
+<div class="highlight"><pre><span></span><code>[mcu rpi]
+serial: /tmp/klipper_host_mcu
+
+[mpu9250]
+i2c_mcu: rpi
+i2c_bus: i2c.1
+
+[resonance_tester]
+accel_chip: mpu9250
+probe_points:
+    100, 100, 20  # an example
+</code></pre></div>
+
 <p>Restart Klipper via the <code>RESTART</code> command.</p>
 <h2 id="measuring-the-resonances">Measuring the resonances<a class="headerlink" href="#measuring-the-resonances" title="Permanent link">&para;</a></h2>
 <h3 id="checking-the-setup">Checking the setup<a class="headerlink" href="#checking-the-setup" title="Permanent link">&para;</a></h3>