Where can I start looking to see how ESPHome implements this?. This is the ESPHome page for the Dallas sensor:

Dallas Sensor

This is the YAML code that ESPHome uses to flash my T-Display_S3:

esphome:
  name: developer-temp
  friendly_name: Developer Temp

external_components:
  - source: github://landonr/lilygo-tdisplays3-esphome
    components: [tdisplays3]

esp32:
  board: esp32-s3-devkitc-1
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

ota:
  password: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Developer-Temp Fallback Hotspot"
    password: "xxxxxxxxxxxxxxxxx"

captive_portal:
  
# bluetooth_proxy:
#   active: true  

time:
  - platform: homeassistant
    id: ha_time

switch:
  - platform: gpio
    pin: GPIO38
    name: "Backlight"
    id: backlight
    internal: true
    restore_mode: RESTORE_DEFAULT_ON

  - platform: gpio
    pin: GPIO15
    name: "Battery"
    id: battery
    internal: true
    restore_mode: RESTORE_DEFAULT_ON  

dallas:
 - pin: GPIO43
   update_interval: 5s
  

sensor:
  - platform: dallas
    address: 0xd901211238e13128
    name: "Developer Temperature"
    resolution: 12
    id: devTemp  

  - platform: adc
    pin: 4
    raw: True
    filters:
      - multiply: 0.00095238 # 3.9/4095, for attenuation 11db
    attenuation: 11db
    name: VBatt
    id: vcc
    update_interval: 5s
   
font:
  - file:
      type: gfonts
      family: Roboto
      weight: 300 
    id: font1
    size: 14  

  - file: 'Tahoma.ttf'  
    id: font2
    size: 14
    
  - file: 'Tahoma-Bold.ttf'
    id: font3
    size: 14   


#Web Server
web_server:
  port: 80

mqtt:
  broker: !secret mqtt_ip
  port: !secret mqtt_port
  username: !secret mqtt_user
  password: !secret mqtt_pass


#Display Resolution 320x170
display:
  - platform: tdisplays3
    id: disp
    update_interval: 1s
    rotation: 270
    lambda: |-

      auto headerBckgrd = Color(210, 0, 0);
      auto entityNames = Color(0, 255, 0);
      auto dataBckgrnd = Color(101, 101, 101);
      auto entityBckgrnd = Color(50, 50, 50);
      auto data = Color(255, 255, 255);
      auto orange = Color(255, 165, 0);
      auto black = Color(0, 0, 0);

      auto col1 = 60;
      auto col2 = 70;
      auto col3 = 225;
      auto col4 = 235;
      auto fontSize = 14;
      auto spacing = 2;
      auto line1 = 0;

      it.filled_rectangle(0, 0, 320, 170, dataBckgrnd);
      it.filled_rectangle(0, 18, 65, 170, entityBckgrnd);
      it.filled_rectangle(160, 18, 70, 170, entityBckgrnd);
      it.filled_rectangle(0, 0, 320, 19, headerBckgrd);
      it.line(160, 19, 160, 170, headerBckgrd);

      it.printf(160, line1, id(font3), data, TextAlign::TOP_CENTER, "Developer Temperature");

      it.print((col1), 21, id(font2), entityNames, TextAlign::TOP_RIGHT, "Date");
      it.printf(col2, 21, id(font2), data, TextAlign::TOP_LEFT, id(ha_time).now().strftime("%m-%d-%Y").c_str());
      it.print(col1, 37, id(font2), entityNames, TextAlign::TOP_RIGHT, "Time");
      it.printf(col2, 37, id(font2), data, TextAlign::TOP_LEFT, id(ha_time).now().strftime("%I:%M:%S %p").c_str());

      
      it.print(col1, 101, id(font2), entityNames, TextAlign::TOP_RIGHT, "DEV");
      it.printf(col2, 101, id(font2), data, TextAlign::TOP_LEFT, "%.1f° C", id(devTemp).state);
      it.print(col1, 117, id(font2), entityNames, TextAlign::TOP_RIGHT, "Battery");
      it.printf(col2, 117, id(font2), data, TextAlign::TOP_LEFT, "%.1f (%.2f %%)", id(vcc).state);

I super appreciate all you time spent on this. Please let me know when you don't have any more interest/time.

Volos Projects

Code in GitHub for his project

I see that he uses libraries specific to these small sensors so I am assuming that the pins get assigned there.

Unfortunately my project needs to use the JST connector as I have it in a case for a particular use. If need be, I will go back to flashing it with ESPHome but would love to figure out how to use the JST connector as it looks like the best quick solution to connecting many sensors in a clean, universal way.

#include <OneWire.h>
#include <DallasTemperature.h>
const int oneWireBus = 17; //WORKS with pin17 but neither 43 or 44.
OneWire oneWire(oneWireBus);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(115200);
  sensors.begin();
}

void loop() {
  sensors.requestTemperatures();
  float temperatureC = sensors.getTempCByIndex(0);
  Serial.print(temperatureC);
  Serial.println("ºC");
  Serial.println("   ");
  delay(2000);
}