arduino_port_expander.h

// this gist is no longer needed,
// see https://github.com/glmnet/esphome-components/blob/main/docs/arduino_port_extender.md
// for up to date information

arduino_port_expander_sketch.ino

// this gist is no longer needed,
// see https://github.com/glmnet/esphome-components/blob/main/docs/arduino_port_extender.md
// for up to date information

Nice, looks like, that it's working :-)

I can not test binary_sensor, but my 8 Outputs and 6 Analog Inputs are working directly.

My big test example:

esphome:
  name: test_arduino

esp8266:
  board: d1_mini

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

api:

ota:

# define i2c device
# for an ESP8266 SDA is D2 and goes to Arduino's A4
#                SCL is D1 and goes to Arduino's A5
i2c:
  id: i2c_component

logger:
  level: DEBUG

external_components:
  - source: github://glmnet/esphome@ape-external-component
    components: [arduino_port_expander]

arduino_port_expander:
  id: ape
  address: 0x08
  analog_reference: DEFAULT

output:
  - platform: gpio
    pin:
      arduino_port_expander: ape
      number: 9
      mode:
        output: True
    id: relay_1
    inverted: true
  - platform: gpio
    pin:
      arduino_port_expander: ape
      number: 8
      mode:
        output: True
    id: relay_2
    inverted: true
  - platform: gpio
    pin:
      arduino_port_expander: ape
      number: 7
      mode:
        output: True
    id: relay_3
    inverted: true
  - platform: gpio
    pin:
      arduino_port_expander: ape
      number: 6
      mode:
        output: True
    id: relay_4
    inverted: true
  - platform: gpio
    pin:
      arduino_port_expander: ape
      number: 5
      mode:
        output: True
    id: relay_5
    inverted: true
  - platform: gpio
    pin:
      arduino_port_expander: ape
      number: 4
      mode:
        output: True
    id: relay_6
    inverted: true
  - platform: gpio
    pin:
      arduino_port_expander: ape
      number: 3
      mode:
        output: True
    id: relay_7
    inverted: true
  - platform: gpio
    pin:
      arduino_port_expander: ape
      number: 2
      mode:
        output: True
    id: relay_8
    inverted: true

switch:
  - platform: output
    name: Relais 1
    id: relais01
    output: relay_1
  - platform: output
    name: Relais 2
    id: relais02
    output: relay_2
  - platform: output
    name: Relais 3
    id: relais03
    output: relay_3
  - platform: output
    name: Relais 4
    id: relais04
    output: relay_4
  - platform: output
    name: Relais 5
    id: relais05
    output: relay_5
  - platform: output
    name: Relais 6
    id: relais06
    output: relay_6
  - platform: output
    name: Relais 7
    id: relais07
    output: relay_7
  - platform: output
    name: Relais 8
    id: relais08
    output: relay_8

    
sensor:
  - platform: arduino_port_expander
    id: analog_input_1_humidity
    pin: A6
    name: Eingang 1 Bodenfeuchtigkeit
    unit_of_measurement: "%"
    device_class: humidity
    state_class: measurement
    accuracy_decimals: 0
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v
      - calibrate_linear:
          - 0.95 -> 100
          - 2.5 -> 0
      - lambda: |
          if (x < 0) return 0; 
          else if (x > 100) return 100;
          else return (x);
  - platform: arduino_port_expander
    id: analog_input_1_voltage
    pin: A6
    name: Eingang 1 Spannung
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v


  - platform: arduino_port_expander
    id: analog_input_2_humidity
    pin: A7
    name: Eingang 2 Bodenfeuchtigkeit
    unit_of_measurement: "%"
    device_class: humidity
    state_class: measurement
    accuracy_decimals: 0
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v
      - calibrate_linear:
          - 0.95 -> 100
          - 2.5 -> 0
      - lambda: |
          if (x < 0) return 0; 
          else if (x > 100) return 100;
          else return (x);
  - platform: arduino_port_expander
    id: analog_input_2_voltage
    pin: A7
    name: Eingang 2 Spannung
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v


  - platform: arduino_port_expander
    id: analog_input_3_humidity
    pin: A0
    name: Eingang 3 Bodenfeuchtigkeit
    unit_of_measurement: "%"
    device_class: humidity
    state_class: measurement
    accuracy_decimals: 0
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v
      - calibrate_linear:
          - 0.95 -> 100
          - 2.5 -> 0
      - lambda: |
          if (x < 0) return 0; 
          else if (x > 100) return 100;
          else return (x);
  - platform: arduino_port_expander
    id: analog_input_3_voltage
    pin: A0
    name: Eingang 3 Spannung
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v


  - platform: arduino_port_expander
    id: analog_input_4_humidity
    pin: A1
    name: Eingang 4 Bodenfeuchtigkeit
    unit_of_measurement: "%"
    device_class: humidity
    state_class: measurement
    accuracy_decimals: 0
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v
      - calibrate_linear:
          - 0.95 -> 100
          - 2.5 -> 0
      - lambda: |
          if (x < 0) return 0; 
          else if (x > 100) return 100;
          else return (x);
  - platform: arduino_port_expander
    id: analog_input_4_voltage
    pin: A1
    name: Eingang 4 Spannung
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v


  - platform: arduino_port_expander
    id: analog_input_5_humidity
    pin: A2
    name: Eingang 5 Bodenfeuchtigkeit
    unit_of_measurement: "%"
    device_class: humidity
    state_class: measurement
    accuracy_decimals: 0
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v
      - calibrate_linear:
          - 0.95 -> 100
          - 2.5 -> 0
      - lambda: |
          if (x < 0) return 0; 
          else if (x > 100) return 100;
          else return (x);
  - platform: arduino_port_expander
    id: analog_input_5_voltage
    pin: A2
    name: Eingang 5 Spannung
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v


  - platform: arduino_port_expander
    id: analog_input_6_humidity
    pin: A3
    name: Eingang 6 Bodenfeuchtigkeit
    unit_of_measurement: "%"
    device_class: humidity
    state_class: measurement
    accuracy_decimals: 0
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v
      - calibrate_linear:
          - 0.95 -> 100
          - 2.5 -> 0
      - lambda: |
          if (x < 0) return 0; 
          else if (x > 100) return 100;
          else return (x);
  - platform: arduino_port_expander
    id: analog_input_6_voltage
    pin: A3
    name: Eingang 6 Spannung
    update_interval: 10s
    filters:
      - multiply: 0.004887585532746823069403714565 # x * 1023.0 / 5.0 v

I am embarking on a project in which I need to use H711X, which is natively supported by esphome but I do not have more pins for it.

I have quite a few sensors connected via I2C and when I saw this component arduino_port_expander that allows you to expand I/O ports via I2C I thought it would be a very good option.

I had a pro mini lying around the house so I decided to upload the sketch and connect it to the esp32c3.

I currently do not have the H711X, since I am considering the possibility of using it via I2C, but I have a DHT11 at home and I decided to test if the arduino_port_expander component allows me to control it.

First I did tests by configuring an output associated with pin 13 of the Arduino and I was able to control the LED from home assistant perfectly.

Once I verified that arduino_port_expander was working correctly I decided to try the DHT11. First I had to modify the DHT11 component so that it allowed the arduino_port_expander pins to be configured and not just the internal ones of the esp32 running esphome. Change InternalGPIOPin to GPIOPin

in yaml:

arduino_port_expander:
  id: ape1 # must identify somehow to later use
  i2c_id: tca9548a_ch0
  address: 0x08
  analog_reference: DEFAULT

sensor:
  - platform: dht
    pin:
      arduino_port_expander: ape1
      number: 2
    temperature:
      name: "Living Room Temperature"
    humidity:
      name: "Living Room Humidity"
    update_interval: 60s

Unfortunately, although it compiles perfectly, on boot it causes bootloop (I imagine due to wdt)

It seems that the sensors where communication is time critical do not work through I/O I2C expanders.

Still, arduino_port_expander is a cool component.

Thank you!

I forgot to mention here I created a new repo for this. See here

@fran6120 thats a nice story but the end was predicted. If you’re short on pins you can try to use the expander for simple io pins, eg relays switches and save internal gpio for sensors which requiere fast io pins. (And also switching pin mode from input to output quickly)

Hi, do you know about the Problem, that neighborhood Analog Inuts have wrong values.

I want to read some of those Sensors: https://de.aliexpress.com/item/1005004819365767.html

Reading a single Sensor has no problems (eg A0). But if I add a second one to A1, the voltage is much higher as its really is.

I have no really solution.

On some Formthreads, they write, that you have to read the ANalog Pin twice and only use the second result:

https://forum.arduino.cc/t/analog-input-affected-by-its-neighbor/88758
or
https://forum.arduino.cc/t/cross-voltages-from-neighbor-analog-input/178708

That’s interesting. Didn’t know

you can try using update interval: none on the sensor s so you disable automatic polling. Then write an interval script which will call component update on the sensors, eg call it twice in A0 and the pick the value on the second call then call twice A1

Do you have a small example for me? I will test it shortly.

This does disables polling and calls to update explicitly

https://github.com/glmnet/esphome_devices/blob/master/my_home/eh-energia.yaml

You might want to create another template sensor which you’ll set the value you read the second time

Thank you,

I think I got it.

I added a dummy analogRead() to the arduino Script before the reading for publishing.

Also I found a thread: firmata/arduino#334 (comment)

I also have added a interval Script to my yaml, to read the Analog Sensors in the correct sequence

  - interval: 60s
    then:
      - component.update: analog_input_3_humidity
      - delay: 1s
      - component.update: analog_input_3_voltage
      - delay: 10s
      - component.update: analog_input_4_humidity
      - delay: 1s
      - component.update: analog_input_4_voltage
      - delay: 10s
      - component.update: analog_input_5_humidity
      - delay: 1s
      - component.update: analog_input_5_voltage
      - delay: 10s
      - component.update: analog_input_6_humidity
      - delay: 1s
      - component.update: analog_input_6_voltage
      - delay: 10s
      - component.update: analog_input_1_humidity
      - delay: 1s
      - component.update: analog_input_1_voltage
      - delay: 10s
      - component.update: analog_input_2_humidity
      - delay: 1s
      - component.update: analog_input_2_voltage```

Now I will test it for a couple of Days :-)

Hola buen dia. Existe la manera de usar el sensor dht11 conectado en arduino. Soy nuevo en esto y no he encontrado la manera.

Hello i am trying to use Arduino Port Expander in my home project where reliability is really important .

As a test, temporary I braked the i2c line between the port expander and the esp device. I got a following error immediately (which is good) :

[E][component:112]: Component was marked as failed.
And never recovered (that is not good).

I wonder how can this made more robust? eg. after the transient is gone should recover by them self.

Thank you

Hello everyone,

I have a little dumb question, I have it all working (the first version was working for me here),
but .... if the i2c bus hangs for some reason, I know the command to reset the ESP8266 ---> "- platform: restart",
but not the NANO (in my case) ... (so the i2c bus won't reset), is there a easy way to reset the NANO too in that same command ?

GreetingZzz

lol ... I see it now, @balazs111 has the same question :-)

Hello,

here is the solution: https://community.home-assistant.io/t/arduino-port-expander-i2c-connection-not-recover-after-failure/745984
In the end decided to use modbus because i needed to breach a longer distance what i2c was not able to handle

Hi @glmnet,
any chance you make a version for Arduino Mega 2560?
I've been using a modified version from @thebradleysanders in the last years, but with the migration from custom to external components I've lost the possibility to update my devices with the latest versions of esphome.

Thanks. Bye,
Vito