PCF8574 input help to config

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I have to configure 8 contact sensor connected to a PCF8574…
work well in the shell that show the change of status but not in pimatic

    {
      "plugin": "cron"
    },
    {
      "plugin": "mobile-frontend"
    },
    {
      "i2cBusNr": 1,
      "plugin": "pcf8574",
      "active": true
    }
  ],
  "devices": [
    {
      "address": "0x3c",
      "inputChangeDetection": "none",
      "id": "i2c-3c",
      "name": "i2c 3c",
      "class": "PCF8574IC"
    },
    {
      "PCF8574IC": "i2c-3c",
      "pinNumber": 0,
      "inverted": false,
      "id": "input-0",
      "name": "Input 0",
      "class": "PCF8574ContactSensor"
    },
    {
      "PCF8574IC": "i2c-3c",
      "pinNumber": 3,
      "inverted": false,
      "id": "input-3",
      "name": "Input 3",
      "class": "PCF8574ContactSensor"
    }
  ],

thanks

Hi Zacca,

you need to set the inputChangeDetection of the PCF8574IC device to interrupt or polling depending on your hardware.
If you are able to use the interrupt signal of the PCF8574 I recommend interrupt because this will detect even very shot signals while keeping low traffic on the i2c bus.
With polling the input states are checked in the given interval to detect changes. This may lose some short signals depending on the the interval, but ist doesn’t require the additional interrupt wire.

@pmueller sorry for the trouble and thanks for the answer but unfortunately I have not solved … I had already tried that way.

I have the classic contact circuit made by me and also used directly in the gpio.

From the command shell it works well …

pi @ raspberrypi: ~ $ gpio -x pcf8574: 100: 0x3c read 100
0
pi @ raspberrypi: ~ $ gpio -x pcf8574: 100: 0x3c read 103
1

logically the pin 0 is open and the pin 3 is close

Can you try this config and post the log (debug output)?

  "plugins": [
    ...
    {
      "i2cBusNr": 1,
      "plugin": "pcf8574",
      "active": true,
      "debug": true
    }
  ],
  "devices": [
    {
      "address": "0x3c",
      "inputChangeDetection": "polling",
      "pollingInterval": 200,
      "id": "i2c-3c",
      "name": "i2c 3c",
      "class": "PCF8574IC"
    },
    {
      "PCF8574IC": "i2c-3c",
      "pinNumber": 0,
      "inverted": false,
      "id": "input-0",
      "name": "Input 0",
      "class": "PCF8574ContactSensor"
    },
    {
      "PCF8574IC": "i2c-3c",
      "pinNumber": 3,
      "inverted": false,
      "id": "input-3",
      "name": "Input 3",
      "class": "PCF8574ContactSensor"
    }
  ],

The two contact sensors should show the state of the pins.

Maybe a restart of pimatic is required after config change.

No, it does not work
this is my debugging

15:31:59.815 2018-12-14 Friday
15:32:09.163 [pimatic] info: Starting pimatic version 0.9.42
15:32:12.886 [pimatic, ppm] info: 2.15.12
15:32:12.961 [pimatic] info: Loading plugin: "pimatic-cron" (0.8.8)
15:32:13.790 [pimatic] info: Loading plugin: "pimatic-mobile-frontend" (0.9.11)
15:32:14.965 [pimatic] info: Loading plugin: "pimatic-pcf8574" (1.0.4)
15:32:15.554 [pimatic] info: Loading plugin: "pimatic-gpio" (0.9.0)
15:32:15.660 [pimatic-cron] info: the time is: Fri Dec 14 2018 15:32:15 GMT+0100 (CET)
15:32:15.797 [pimatic-pcf8574] debug: config { i2cBusNr: 1, plugin: 'pcf8574', active: true, debug: true }
15:32:17.156 [pimatic-pcf8574] debug: init i2c-3c with address 60
15:32:17.163 [pimatic-pcf8574] debug: i2c-3c polling for input changes every 200 ms
15:32:17.175 [pimatic] info: New device "i2c 3c"...
15:32:17.214 [pimatic-pcf8574] debug: PCF8574ContactSensor { PCF8574IC: 'i2c-3c',
15:32:17.214 [pimatic-pcf8574] debug:>  pinNumber: 0,
15:32:17.214 [pimatic-pcf8574] debug:>  inverted: false,
15:32:17.214 [pimatic-pcf8574] debug:>  id: 'input-0',
15:32:17.214 [pimatic-pcf8574] debug:>  name: 'Input 0',
15:32:17.214 [pimatic-pcf8574] debug:>  class: 'PCF8574ContactSensor' } { contact: { time: 1544797529167, value: false } }
15:32:17.225 [pimatic] info: New device "Input 0"...
15:32:17.297 [pimatic-pcf8574] debug: PCF8574ContactSensor { PCF8574IC: 'i2c-3c',
15:32:17.297 [pimatic-pcf8574] debug:>  pinNumber: 3,
15:32:17.297 [pimatic-pcf8574] debug:>  inverted: false,
15:32:17.297 [pimatic-pcf8574] debug:>  id: 'input-3',
15:32:17.297 [pimatic-pcf8574] debug:>  name: 'Input 3',
15:32:17.297 [pimatic-pcf8574] debug:>  class: 'PCF8574ContactSensor' } { contact: { time: 1544797529215, value: false } }
15:32:17.305 [pimatic] info: New device "Input 3"...
15:32:17.669 [pimatic-mobile-frontend] info: packing static assets
15:32:18.323 [pimatic-mobile-frontend] info: packing static assets finished
15:32:18.337 [pimatic-mobile-frontend] info: rendering html
15:32:31.410 [pimatic-mobile-frontend] info: rendering html finished
15:32:31.414 [pimatic-pcf8574] error: Error setting pin as input (device: input-0, pcf8574ic: i2c-3c, pin: 0)
15:32:31.501 [pimatic] info: Listening for HTTP-request on port 80...
15:32:31.550 [pimatic-pcf8574] error: Error setting pin as input (device: input-3, pcf8574ic: i2c-3c, pin: 3)

@zacca said in PCF8574 input help to config:

Error setting pin as input (device: input-0, pcf8574ic: i2c-3c, pin: 0)

Seams like there is an error during the init of the pins.

I’ve released a new version (v1.0.5) of the plugin which adds extra error output in this case. Please update and show your log again.

debug with new version

08:37:32.824 2018-12-17 Monday
08:37:41.944 [pimatic] info: Starting pimatic version 0.9.42
08:37:45.588 [pimatic, ppm] info: 2.15.12
08:37:45.664 [pimatic] info: Loading plugin: "pimatic-cron" (0.8.8)
08:37:46.467 [pimatic] info: Loading plugin: "pimatic-mobile-frontend" (0.9.11)
08:37:47.623 [pimatic] info: Loading plugin: "pimatic-gpio" (0.9.0)
08:37:47.728 [pimatic] info: Loading plugin: "pimatic-pcf8574" (1.0.5)
08:37:48.305 [pimatic-cron] info: the time is: Mon Dec 17 2018 08:37:48 GMT+0100 (CET)
08:37:49.798 [pimatic] info: New device "i2c 3c"...
08:37:49.850 [pimatic] info: New device "Input 0"...
08:37:49.923 [pimatic] info: New device "Input 3"...
08:37:50.277 [pimatic-mobile-frontend] info: packing static assets
08:37:50.932 [pimatic-mobile-frontend] info: packing static assets finished
08:37:50.945 [pimatic-mobile-frontend] info: rendering html
08:38:03.970 [pimatic-mobile-frontend] info: rendering html finished
08:38:03.995 [pimatic-pcf8574] error: Error setting pin as input (device: input-0, pcf8574ic: i2c-3c, pin: 0)
08:38:03.998 [pimatic-pcf8574] error: An other poll is in progress
08:38:04.066 [pimatic] info: Listening for HTTP-request on port 80...
08:38:04.102 [pimatic-pcf8574] warn: i2c-3c Error while polling: An other poll is in progress

I’ve released v1.0.6 which should fix this issue.

Yes … now it works
Thank you very much … if you come here in Italy you have a paid dinner.

The only thing is that pimatic gives me normally closed, while pcf8574 should not have inverted like mcp23017 but without any intervention it should be open

@zacca said in PCF8574 input help to config:

The only thing is that pimatic gives me normally closed, while pcf8574 should not have inverted like mcp23017 but without any intervention it should be open

When using a pin of the PCF8574 as input, the internal pullup is enabled.
If your button is connected like this

  | | | | | | | |
  o_o_o_o_o_o_o_o
 |PCF8574        |
 | _ _ _ _ _ _ _ |
  o o o o o o o o
  | | | | | | | |
        |
        o
        '\
          \
        o  \
        |
       ===
       GND

you should get closed while the button is not pressed because pin is logically high.
In this case you may set inverted: true in the device config to read the high signal as opened

Sorry @pmuller…i’m here again with problems.
When I tried the plugin with my test card seemed to work all right.
A few days ago I installed the final card but unfortunately always busy polling error. Or something similar…sorry but i don’t have internet where i installed the pcb
Another thing is that when restart pimatic the initial state of the gpio should be all open while it looks like this.

In the pimatic “official” now a simple expansion pcf8574 is installed without anything connected with this configuration …

{
      "address": "0x3c",
      "inputChangeDetection": "polling",
      "id": "pcf8574-3c",
      "name": "Pcf8574 3c",
      "class": "PCF8574IC"
    },

but unfortunately I continue to have the following error…

14:56:34.142 [pimatic-pcf8574] warn: pcf8574-3c Error while polling: An other poll is in progress

Hi I have exactly the same problem I can’t get the inputs to detect any change at all. Also when updating the device I get the polling error. As outputs they work great! only input is a problem. Both as polling or interrupt I can’t detect any change.

@zacca and @boxter
can you show me some log output while debugging is enabled?
Do the errors occur even after restarting pimatic, or only when updating a device?

@Zacca
On restart the last known state is currently used as initial state. That means if your device was closed on pimatic shutdown it will remain closed when starting pimatic again regardless of the hardware state. Only a hardware change will update the state.
I will fix this in the next release, so that the inputs are always read during startup and shown correctly.

Hi
I setup a PCF8574 on address 0x27 called PCF03 with polling
Then I created a contact sensor PCF03_0 on pin zero
I also then created an output on pin 2 to check that chip is working and this switch worked.
I tried making pin 1 high and low and no effect on contact sensor

10:15:24.335 [pimatic] info: New device "pcf03_0"...
10:15:24.863 [pimatic-pcf8574] debug: pcf03-0 input pin initialized
10:17:00.633 [pimatic-pcf8574] debug: destroy pcf03
10:17:00.662 [pimatic-pcf8574] debug: init pcf03 with address 39
10:17:00.671 [pimatic-pcf8574] debug: pcf03 polling for input changes every 200 ms
10:17:00.682 [pimatic] info: Recreating "pcf03"...
10:17:00.952 [pimatic-pcf8574] debug: pcf03 Polling paused while setup of this device is not done
10:17:00.966 [pimatic-pcf8574] debug: pcf03 setup done
10:17:27.984 [pimatic-pcf8574] debug: PCF8574ContactSensor { PCF8574IC: 'pcf03',
10:17:27.984 [pimatic-pcf8574] debug:>  pinNumber: 0,
10:17:27.984 [pimatic-pcf8574] debug:>  inverted: false,
10:17:27.984 [pimatic-pcf8574] debug:>  echo: { additionalNames: [] },
10:17:27.984 [pimatic-pcf8574] debug:>  id: 'pcf03-0',
10:17:27.984 [pimatic-pcf8574] debug:>  name: 'pcf03_0',
10:17:27.984 [pimatic-pcf8574] debug:>  class: 'PCF8574ContactSensor' } { contact: { time: 1550304924756, value: false } }
10:17:28.005 [pimatic] info: Recreating "pcf03_0"...
10:17:28.322 [pimatic-pcf8574] error: Error setting pin as input (device: pcf03-0, pcf8574ic: pcf03, pin: 0)
10:17:28.332 [pimatic-pcf8574] error: An other poll is in progress
10:18:10.782 [pimatic-pcf8574] debug: PCF8574ContactSensor { PCF8574IC: 'pcf03',
10:18:10.782 [pimatic-pcf8574] debug:>  pinNumber: 0,
10:18:10.782 [pimatic-pcf8574] debug:>  inverted: false,
10:18:10.782 [pimatic-pcf8574] debug:>  echo: { additionalNames: [] },
10:18:10.782 [pimatic-pcf8574] debug:>  id: 'pcf03-1',
10:18:10.782 [pimatic-pcf8574] debug:>  name: 'PCF03_1',
10:18:10.782 [pimatic-pcf8574] debug:>  class: 'PCF8574ContactSensor' } {}
10:18:10.800 [pimatic] info: New device "PCF03_1"...
10:18:11.232 [pimatic-pcf8574] error: Error setting pin as input (device: pcf03-1, pcf8574ic: pcf03, pin: 0)
10:18:11.243 [pimatic-pcf8574] error: An other poll is in progress
10:21:38.022 [pimatic-pcf8574] debug: PCF8574Switch { PCF8574IC: 'pcf03',
10:21:38.022 [pimatic-pcf8574] debug:>  pinNumber: 2,
10:21:38.022 [pimatic-pcf8574] debug:>  inverted: true,
10:21:38.022 [pimatic-pcf8574] debug:>  echo: { additionalNames: [] },
10:21:38.022 [pimatic-pcf8574] debug:>  id: 'pcf03-2',
10:21:38.022 [pimatic-pcf8574] debug:>  name: 'pcf03_2',
10:21:38.022 [pimatic-pcf8574] debug:>  class: 'PCF8574Switch' } {}
10:21:38.087 [pimatic] info: New device "pcf03_2"...
10:21:38.483 [pimatic-pcf8574] debug: pcf03-2 output pin initialized
10:23:26.544 [pimatic-pcf8574] warn: pcf03 Error while polling: An other poll is in progress
10:23:34.036 [pimatic-pcf8574] debug: pcf03-2 changeStateTo true
10:23:45.617 [pimatic-pcf8574] debug: pcf03-2 changeStateTo false

Hi
One other thing to note is that I did have the Johhny 5 plugin loaded but deactivated, as I tried this plugin before but it is not able to have outputs inverted on switches which the PCF plugin can. Not sure if it will cause any conflicts and if I should totally uninstall it.?