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en/step_1.md

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## What you will make
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Use an **ultrasonic sensor** with a **Raspberry Pi Pico** to detect when a water barrel or bucket is too empty and turn on an **LED warning light**.
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This project uses an **ultrasonic sensor** with a **Raspberry Pi Pico** to detect when a water barrel or bucket is too empty and turn on an **LED warning light**.
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### You will need:
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- **Raspberry Pi Pico** — microcontroller for running the system
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- **USB power supply (5V)**to power the Raspberry Pi Pico
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- **Ultrasonic distance sensor (HC-SR04)** — to detect surface distance
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- **Breadboard and jumper wires** — for assembling the circuit
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- **LED** to show when the tank needs to be filled
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- **1kΩ resistor and 2kΩ resistor** — for the **ECHO** pin voltage divider
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- **Ultrasonic Distance Sensor (HC-SR04)**detects surface distance
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- **USB Power (5 V)** — to power the Pico
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- **Breadboard and jumper wires** — for temporary circuit assembly
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- **LED** - to tell you when the tank needs filling
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- **2 resistors (1kΩ and 2kΩ)** — for the ECHO pin voltage divider
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- Barrel, bucket, or small tank of water
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To program the Raspberry Pi Pico, you will also need the [Thonny IDE](http://thonny.org/){:target="_blank"}, and MicroPython must be installed on your Raspberry Pi Pico. You can find [instructions to help you set up here](https://projects.raspberrypi.org/en/projects/getting-started-with-the-pico/2){:target="_blank"}.
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To program the Raspberry Pi Pico, you will also need the [Thonny IDE](http://thonny.org/){:target="_blank"} and MicroPython packages installed. [Instructions for this process are available here.](https://projects.raspberrypi.org/en/projects/getting-started-with-the-pico/2){:target="_blank"}

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