Examples

A greenhouse controller

The relay closes when the DS18B20 passes 28 °C; an ultrasonic sensor measures distance too.

Arduino Uno R35 libraries48 linesOverall confidence 100%

SourceRead onlyuno_temp_relay.ino

// Greenhouse controller — Arduino Uno + DS18B20 + relay + OLED + ultrasonic #include <OneWire.h> #include <DallasTemperature.h> #include <Wire.h> #include <Adafruit_SSD1306.h> #include <NewPing.h> #define ONE_WIRE_BUS 4 #define RELAY_PIN 7 #define STATUS_LED 9 #define TRIG_PIN 12 #define ECHO_PIN 8 #define BTN_PIN 2 OneWire oneWire(ONE_WIRE_BUS); DallasTemperature sensors(&oneWire); Adafruit_SSD1306 display(128, 64, &Wire, -1); NewPing sonar(TRIG_PIN, ECHO_PIN, 200); volatile bool pressed = false; void onPress() { pressed = true; } void setup() { Serial.begin(9600); pinMode(RELAY_PIN, OUTPUT); pinMode(STATUS_LED, OUTPUT); pinMode(BTN_PIN, INPUT_PULLUP); attachInterrupt(digitalPinToInterrupt(BTN_PIN), onPress, FALLING); sensors.begin(); display.begin(SSD1306_SWITCHCAPVCC, 0x3C); display.setTextColor(SSD1306_WHITE); // Adafruit_GFX defaults to 0xFFFF, which SSD1306 draws as nothing } void loop() { sensors.requestTemperatures(); float t = sensors.getTempCByIndex(0); unsigned int cm = sonar.ping_cm(); digitalWrite(RELAY_PIN, t > 28.0 ? HIGH : LOW); analogWrite(STATUS_LED, (int)(t * 4)); Serial.print("T="); Serial.print(t, 1); Serial.print("C dist="); Serial.print(cm); Serial.print("cm relay="); Serial.println(t > 28.0 ? "ON" : "OFF"); display.clearDisplay(); display.setCursor(0, 0); display.print(t); display.display(); delay(1000); }

What the parser saw

Extracted from #include · #define · pinMode · constructor arguments. The output of a deterministic parser, not an AI.

Parts

ds18b20#include <OneWire.h>

90%

ssd1306_i2c#include <Adafruit_SSD1306.h>

60%

hc_sr04#include <NewPing.h>

90%

relay_1chidentifier RELAY_PIN

60%

ledidentifier STATUS_LED

60%

buttonidentifier BTN_PIN

60%

Buses

I²CSDA=A4 · SCL=A5Addresses0x3c

Libraries

#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <NewPing.h>

Pin contract

An immutable contract owned by the project. It survives level changes; on a target board only the physical pins are remapped.

Logical name	Pin	Direction	Signal	Declared as
SDA	A4	bi	i2c	#define
SCL	A5	out	i2c	#define
BTN_PIN	D2	in	interrupt	#define
ONE_WIRE_BUS	D4	unknown	digital	#define
RELAY_PIN	D7	out	digital	#define
ECHO_PIN	D8	unknown	digital	#define
STATUS_LED	D9	out	pwm	#define
TRIG_PIN	D12	unknown	digital	#define

This page passes no verification gate. Logic (simulator), electrical (ERC · DRC) and physical (your confirmation) verification each run separately inside a project.

Next step

Same sketch, from simulation to PCB

The code stays as it is. Run it on avr8js in the Playground; import it into a project and the 8-pass electrical verification, KiCad board generation and Gerber export follow.

Run in Playground Import into a project