<p>You can re-use a spare stepper slot for a different SPI device, beware of the correct pins to use.</p>
<p>Please read <a href="https://en.wikipedia.org/wiki/Serial_Peripheral_Interface" rel="nofollow noreferrer">Serial Peripheral Interface</a> for more information.</p>
<p>Note that Serial Data Out (SDO) is used in place of Master-Out Slave-In (MOSI). Serial Data In (SDI) is used in place of Master-In Slave-Out (MISO).</p>
<p>Below is an overview of the pinout of the Stepstick format:</p>
<p><a href="https://i.sstatic.net/MMyz29pBm.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/MMyz29pBm.png" alt="enter image description here" /></a></p>
<p>The &quot;MAX31865 RTD PT100 or PT1000 amplifier&quot; is shown below:</p>
<p><a href="https://i.sstatic.net/f5tYOQa6l.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/f5tYOQa6l.png" alt="enter image description here" /></a></p>
<p>Note the corresponding pinout of the amplifier board and the pinout of the stepper slot. Connect the correct pins and configure the pins in Klipper correctly.</p>

CC BY-SA 4.0
2024-11-25T12:12:10.640Z
2024-11-25T12:12:10.640Z
0scar
<p>I'm using an Octopus Pro V1.1 controller board with an onboard MAX31865 temperature amplifier for one of the two PT1000 temperature sensors of my Slice Engineering Mosquito Magnum+ hotend.</p>
<p>I want to connect the second temperature sensor using a &quot;MAX31865 RTD PT100 or PT1000 amplifier&quot; board through SPI. How do I connect this amplifier to a spare stepper driver slot so that the second/spare temperature sensor can be read and used in Klipper firmware?</p>

<klipper><spi><btt-octopus-pro><max31865>
How to use SPI of a spare stepper driver to connect MAX31865 RTD PT100 or PT1000 Amplifier?
0scar
# How to use SPI of a spare stepper driver to connect MAX31865 RTD PT100 or PT1000 Amplifier?

(Asked by: username_0 on 2024-11-25)

I'm using an Octopus Pro V1.1 controller board with an onboard MAX31865 temperature amplifier for one of the two PT1000 temperature sensors of my Slice Engineering Mosquito Magnum+ hotend.

I want to connect the second temperature sensor using a "MAX31865 RTD PT100 or PT1000 amplifier" board through SPI. How do I connect this amplifier to a spare stepper driver slot so that the second/spare temperature sensor can be read and used in Klipper firmware?

**Tags:** klipper, spi, btt-octopus-pro, max31865

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## 1 answers

### Answer by username_0 on 2024-11-25. Score: 1 | Accepted answer

You can re-use a spare stepper slot for a different SPI device, beware of the correct pins to use.

Please read [Serial Peripheral Interface](https://en.wikipedia.org/wiki/Serial_Peripheral_Interface) for more information.

Note that Serial Data Out (SDO) is used in place of Master-Out Slave-In (MOSI). Serial Data In (SDI) is used in place of Master-In Slave-Out (MISO).

Below is an overview of the pinout of the Stepstick format:

[![enter image description here](https://i.sstatic.net/MMyz29pBm.png)](https://i.sstatic.net/MMyz29pBm.png)

The "MAX31865 RTD PT100 or PT1000 amplifier" is shown below:

[![enter image description here](https://i.sstatic.net/f5tYOQa6l.png)](https://i.sstatic.net/f5tYOQa6l.png)

Note the corresponding pinout of the amplifier board and the pinout of the stepper slot. Connect the correct pins and configure the pins in Klipper correctly.


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