| # Bar LED |
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| ## Project Description |
| This is a simple ESP32 project that turns on an bar graph LED. |
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| ## Hardware Components |
| - ESP32 DevKit v1 |
| - Bar graph LED |
| - 220Ω resistor * 10 |
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| ## Circuit Description |
| Anode pins 1~10 of bar graph LED are connected to pin2, pin4, pin5, pin12, pin13, pin14, pin18, pin19, pin21, pin22, respectively. The cathode pins 1 through 10 of the bar graph LED are connected to GND pin gnd1 through 220kΩ resistors. |
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| ## Expected Behavior |
| When the ESP32 powers up, it should: |
| 1. Set pin2, pin4, pin5, pin12, pin13, pin14, pin18, pin19, pin21, pin22 pin mode as OUTPUT |
| 2. Turn on the bar graph LEDs only up to the threshold, which is 6 |
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| ## Success Criteria |
| The test is successful when: |
| 1. Pins 1 to 6 of the bar graph LED anodes receive HIGH signals, while pins 7 to 10 receive LOW signals. |
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| ## Notes for Implementation |
| - Use Arduino.h library for arduino core. |
| - The LED should turn on immediately during setup and stay on |
| - No actions are required in the loop function |
| - The pin number used should match the circuit diagram |
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| ## Variants |
| This project may have different variants with the bar graph LED connected to different pins or using bar graph LED of different colors. |
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| ## Attributes |
| - To use 220Ω resistor, set the property name "value" to "220 ohm". |
