How to use the MCP23017

[asm7100]

Hi
How do i use the MCP23017 to output from Domoticz??

I like the MCP23017 Port B0 to on/off a led, by activate a switch on Domoticz
This is my setup i easyesp
Task Settings Value
Device: MCP23017 input
Name: Power
Port: 9
IDX / Var: 5 <- From the Domoticz.
Formula Switch:


What is Formula Switch: to be used to??????

Please Help me.

[Martinus]

Output hasn't had much focus yet and currently only direct GPIO and PWM is working through the /control=xxx http interface. The MCP23017 Input device in the dropdownlist is only used to read inputs on the MCP device. For direct output using http you do not need a task setting.

Output should be controlled with something like this to toggle output:

Code: Select all

http://<ip>/control?cmd=mcpgpio,9,1
http://<ip>/control?cmd=mcpgpio,9,1

But we need to fix this in the next release.

If you haven't set a password on this ESP, you should be able to use the debug command that still exists in the code:

Code: Select all

http://<ip>/?cmd=extwiredout,9,1
http://<ip>/?cmd=extwiredout,9,0

But beware that this will likely be changed.

[asm7100]

Nice and thanks for the quick answer.
Keep up the good work

By the way if you put one more MCP23017 on it but with another add, will you then get more in/outs??

[Martinus]

By the way if you put one more MCP23017 on it but with another add, will you then get more in/outs??

That's possible. The portnumbers just count up.
The first MCP at address offset 0 uses ports 1-16
The next at addres offset 1 uses ports 17-32
etc

[asm7100]

Nice.
How about updating the wiki with it.

[asm7100]

When you use the MCP23017 as inputs, is the internel pullup enabled?

[hamster]

First of all.. just like to say this is a fantastic project.. well impressed..!!

Currently using R20..
Following the previous comments, I managed to get the outputs working..

Also wanted to get some inputs working..
I have one input configured but when I tie the contact on the mcp23017 high or low I don't see any immediate change on my domoticz idx. however i do see an update in the history every one minute ??

Any ideas??

[asm7100]

Yes there is some thing rung there, it's the same is you use GPIO

I try to use it to see if a door is open or closed. (Gpio? to gnd) with or without a pull up res.

[hamster]

Thanks Alan
Standard GPIO's are working ok as inputs..
but not on MCP23017..

[asm7100]

Hamster, do you use pullup res?

[hamster]

I tried using a 4k resister but didn't make any difference..

[Martinus]

Sorry to say that the MCP23017 input plugin only works as a periodic input port scan, similar to sensing temperatures.
So it will not act the same as the input switch plugin on local GPIO ports.

[asm7100]

Can that be changes?

Can we use them as Input and Output, 1 as input, 2, 3 and 4 as output and 8 as input ex.

[hamster]

outputs are working with :-
http://<ip>/?cmd=extwiredout,9,1
http://<ip>/?cmd=extwiredout,9,0
(as posted by martinus)

[asm7100]

Yes i know, but can it bee uses as a mix, input and outputs.

[Martinus]

Can that be changed?

It is changed in R27.

Can we use them as Input and Output, 1 as input, 2, 3 and 4 as output and 8 as input ex.

You can mix input and output for each individual port on the MCP23017.

To use a port as input, select the device and configure that port.
To use a port as output, send the http/mqtt command for that port and it will automatically switch to output.

[Martinus]

When you use the MCP23017 as inputs, is the internel pullup enabled?

Pull-ups on input ports are now enabled by default in R27. So no more floating inputs.

[asm7100]

Nice thanks for the good work