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RevPi Compact FAQ

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I want to count rising edges with the RevPi Compact module, is that possible?

Yes, look here:

https://revolutionpi.de/forum/viewtopic.php?f=8&t=3062#p11153

What is the sampling rate or cycle time of the analogue inputs?

There is a discussion in the forum here, but it is in German

https://revolutionpi.de/forum/viewtopic.php?f=47&t=2945#p10564

Finally, the sampling rate is one second with piControl.

Higher sampling rates are possible without piControl

General information about the analogue inputs and outputs:

Tutorials on the topic with and without piControl

I want to read out an analog PNP sensor with Python - how can I do that?

Have a look at this tutorial:

https://revolutionpi.com/tutorials/digitale-ein-und-ausgaenge-compact/?noredirect=en_US

Have a look at the BitMirror example:

https://revolutionpi.de/forum/viewtopic.php?f=6&t=2535&p=9196&hilit=bitmirror#p9196

The original discussion is here:

https://revolutionpi.de/forum/viewtopic.php?f=3&t=3020

Can the digital inputs work as counters?

No, this is not an integrated function of the RevPi Compact.

Can the digital outputs be used for PWM?

No, this is not an integrated function of the RevPi Compact.

When I look at the /var/log/kern.log, i am seeing a flood of messages "piControl i/o: missed xx cycles". Why is this error? How can we stop this error?

https://revolutionpi.de/forum/viewtopic.php?f=6&t=2998#p10787

I want to connect RS485 to PLC by I/O RS485 at Pin P and N (not USB) , What I have to do?

Have a look at our tutorial

https://revolution.kunbus.com/tutorials/serielle-geraete-anschliessen-compact/

There are two different supply voltages - device and IO channels. Is there a sequence to be observed?

I want to set a GPIO pin high and I don't use piControl. Why does the pin always go low?

There is an undocumented interface on the RevPi Compact, can this be?

The HDMI interface is present but is not considered a warranted capability, therefore we do not warrant or support the HDMI interface.

Can the RevPi Compact be expanded, e.g. with I/O modules?

No, the RevPi Compact is not expandable.

Can the RevPi Compact handle measurements of negative Voltages?

No, the range is 0 - 10 V.

8 x analog Inputs
0-10 V DC, single ended, 16 Bit at piControl, 21 Bit raw value, software switchable current source 2.5 mA

2 x analog Outputs
0-10 V, short-circuit proof, protection against backfeeding, 8-bit resolution,
1 % accuracy, max. current load 10 mA (10 V DC @ 1 k)

https://revolution.kunbus.com/revpi-compact/

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