Pool/Spa Kit

This kit includes the following components permanently mounted onto a PCB. All connections are made through the use of screw-terminals. Probes are threaded for easy use in a pool/spa plumbing.

Measures	Hardware
pH	Isolated - mod-pH - Industrial pH Probe
ORP	Isolated - mod-ORP - Industrial ORP Probe
Temperature	Thermowell Temperature Sensor

Pin	Function
GND	Ground for the board
VIN	3.3-5.0 volt power supply
SDA	Data line for I²C interface
SCL	Clock line for I²C interface
1W	1-Wire signal
EN optional	ENable pin, LOW to enable, HIGH to disable modules
1.1	Provides a connection to the sensing electrode of a pH probe
1.2	Provides a connection to the reference electrode of a pH probe
2.1	Provides a connection to the sensing electrode of a ORP probe
2.2	Provides a connection to the reference electrode of a ORP probe

• all same-name pins are internally connected
• SDA/SCL/1W pins are pulled HIGH through a 4k7 Ohm resistor
• EN pin is pulled low through a 4k7 Ohm resistor

Wiring to a host controller

1.

🔽 Install Arduino IDE

Install the Arduino IDE

2.

📦 Install the libraries

Start the Arduino IDE, press the Sketch menu, and then Include Library > Manage Libraries. Search for and install Microfire_Mod-pH, Microfire_Mod-ORP, and DallasTemperature.

3.

🔢 Code

Create a new sketch and copy/paste the following code.

#include <Microfire_Mod-pH.h>
#include <Microfire_Mod-ORP.h>
#include <OneWire.h>
#include <DallasTemperature.h>     // https://github.com/milesburton/Arduino-Temperature-Control-Library

Microfire::Mod_pH::i2c ph;
Microfire::Mod_ORP::i2c orp;
OneWire oneWire(A1);
DallasTemperature ds18b20(&oneWire);

void setup()
{
    Serial.begin(9600);
    Wire.begin();
    ph.begin();
    orp.begin();
    ds18b20.begin();
}

void loop()
{
    ds18b20.requestTemperatures();
    float ds18b20_tempC = ds18b20.getTempCByIndex(0);
    orp.measureORP();
    ph.measurepH(ds18b20_tempC);

    Serial.println((String)"pH: " + ph.pH);
    Serial.println((String)"mV: " + orp.mV);
    Serial.println((String)"ds18b20_tempC: " + ds18b20_tempC);

    delay(1000);
}

4.

➡️ Upload the code

Pick the board and port, then Upload the code.

5.

🔎 View the output

Open the Serial Monitor, measurements should be displayed in the monitor, with updates every second.

This example YAML is very similar to using the individual components. Ensure the board, wifi and i2c sections are correct. Also make sure the dallas.pin section is the correct pin (from the board’s 1W pin to your host controller).

substitutions:
  friendly_name: Microfire pH+ORP+1Wire
  device_name: microfire-ph-ec-orp
esphome:
  name: $device_name
esp32:
  board: esp32dev
  framework:
    type: arduino
logger:
api:
ota:
wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap:
    ssid: $device_name
    password: !secret wifi_failover
captive_portal:

# import the components
external_components:
  - source:
      type: git
      url: https://github.com/u-fire/ESPHomeComponents/

# https://esphome.io/components/i2c.html
i2c:
  sda: 21
  scl: 22

# https://esphome.io/components/sensor/dallas.html
dallas:
  - pin: 23
    id: dallas_temp

sensor:
  - platform: dallas
    index: 0
    name: "Temperature"
    id: water_temp
    on_value:
      then:
        - component.update: ph

  - platform: mod_ph
    id: ph
    update_interval: never
    name: pH
    temperature_sensor: water_temp

  - platform: mod_orp
    id: orp
    name: ORP

button:
  - platform: template
    id: ph_calibrate_low
    name: pH Calibrate Low 4.0
    icon: mdi:format-vertical-align-bottom
    on_press:
        lambda: |-
          id(ph).calibrateLow(4.0);

  - platform: template
    id: ph_calibrate_mid
    name: pH Calibrate Mid 7.0
    icon: mdi:format-vertical-align-center
    on_press:
        lambda: |-
          id(ph).calibrateMid(7.0);

  - platform: template
    id: ph_calibrate_high
    name: pH Calibrate High 10.0
    icon: mdi:format-vertical-align-top
    on_press:
        lambda: |-
          id(ph).calibrateHigh(10.0);

  - platform: template
    id: ph_calibrate_reset
    name: pH Calibrate Reset
    icon: mdi:restore
    on_press:
        lambda: |-
          id(ph).calibrateReset();

  - platform: template
    id: orp_calibrate_low
    name: ORP Calibrate Single 400 mV
    icon: mdi:format-vertical-align-center
    on_press:
        lambda: |-
          id(orp).calibrateSingle(400);
  
  - platform: template
    id: orp_calibrate_reset
    name: ORP Calibrate Reset
    icon: mdi:restore
    on_press:
        lambda: |-
          id(orp).calibrateReset();

  - platform: factory_reset
    name: Restart with Factory Default Settings

There are more examples for various combinations of sensors/modules on our ESPHomeComponents GitHub repo.