# Relay Channel Single Example

## Introduction

This example demonstrates how to use the relay channel component to control a 2-relay setup with button inputs and LED status indication. It showcases:

- Basic relay channel operations (forward/reverse running, stopping)
- Secondary operations (tilting, direction flipping)
- State change event handling with multiple listeners
- Relay channel run limit
- Button event handling using esp-iot-solution's button component
- Visual feedback using esp-iot-solution's LED indicator component

## How to Use Example

This example has been tested on an `ESP32-C3-DevKitM-1U` board. However, it can be adapted to any ESP32-based board with at least six available GPIO pins by adjusting the configuration options.

### Hardware Required

* An ESP32-based development board
* 2 relays connected to GPIO pins (default: GPIO4, GPIO5)
* 3 buttons connected to GPIO pins:
  - UP button (default: GPIO0)
  - DOWN button (default: GPIO1) 
  - STOP button (default: GPIO2)
* 1 LED for status indication (default: GPIO3)

#### Hardware Schematic

![Hardware Schematic](example_schematic.png)

### Configuration

The example can be configured through `menuconfig` under "Relay Channel Single Example Configuration":

1. Button active level (`EXAMPLE_RLCHN_BTN_ACTIVE_LEVEL`)
   - Select between active LOW or HIGH logic level for buttons
   
2. GPIO assignments:
   - UP button pin (`EXAMPLE_RLCHN_BTN_UP_IO_NUM`, default: 0)
   - DOWN button pin (`EXAMPLE_RLCHN_BTN_DOWN_IO_NUM`, default: 1)
   - STOP button pin (`EXAMPLE_RLCHN_BTN_STOP_IO_NUM`, default: 2)
   - LED indicator pin (`EXAMPLE_RLCHN_LED_INDICATOR_IO_NUM`, default: 3)

3. Long press timing:
   - `EXAMPLE_RLCHN_BTN_LONG_PRESS_TIME_MS`: Duration for long press actions (1500-3000ms, default: 2000ms)

### Button Operations

The example uses esp-iot-solution's `button` component to handle the following operations:

- **UP button**:
  * Short press: Start forward movement
  * Long press: Start forward tilt (stops on release)

- **DOWN button**: 
  * Short press: Start reverse movement
  * Long press: Start reverse tilt (stops on release)

- **STOP button**:
  * Short press: Stop movement
  * Long press: Flip movement direction

### LED Indicator States

The example uses esp-iot-solution's `led_indicator` component to show different states:

- **Running**: LED blinks at 300ms on, 100ms off
- **Tilting**: Fast blink at 100ms on, 50ms off
- **Operation Success**: Two quick blinks
- **Operation Fail**: One long blink

### Dependencies

This example requires:
- ESP-IDF v4.1 or later
- esp-iot-solution components:
  * button v4.1.1 or later
  * led_indicator v1.1.1 or later
- relay_chn component

## Example Output
When the application boots, it will wait for a button event. Then the two state listeners will print state changes.

```log
I (273) main_task: Calling app_main()
I (273) RELAY_CHN_SINGLE_EXAMPLE: Initializing default NVS storage
I (283) RELAY_CHN_SINGLE_EXAMPLE: nvs_flash_init: NVS flash init return: ESP_OK
I (283) RELAY_CHN_SINGLE_EXAMPLE: Initializing relay channel
I (293) gpio: GPIO[4]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (303) gpio: GPIO[5]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (313) RELAY_CHN_SINGLE_EXAMPLE: Initializing buttons
I (313) RELAY_CHN_SINGLE_EXAMPLE: Initializing buttons with active level: 0
I (323) gpio: GPIO[0]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (323) button: IoT Button Version: 4.1.3
I (333) gpio: GPIO[1]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (343) gpio: GPIO[2]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (343) RELAY_CHN_SINGLE_EXAMPLE: Setting up button callbacks. Configured long press time: 2000 ms
I (353) RELAY_CHN_SINGLE_EXAMPLE: Initializing LED indicator
I (363) gpio: GPIO[3]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (373) led_indicator: LED Indicator Version: 1.1.1
I (373) gpio: GPIO[3]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 
I (383) led_indicator: Indicator create successfully. type:GPIO mode, hardware_data:0x3fc97be4, blink_lists:custom
I (393) RELAY_CHN_SINGLE_EXAMPLE: Relay Channel Single Example is ready to operate
I (403) main_task: Returned from app_main()
I (3683) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 1 to 3
I (3683) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from IDLE to FORWARD
I (9513) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 3 to 2
I (9513) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from FORWARD to STOPPED
I (9523) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 2 to 6
I (9533) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from STOPPED to REVERSE_PENDING
I (10313) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 6 to 4
I (10313) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from REVERSE_PENDING to REVERSE
I (32173) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 4 to 2
I (32173) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from REVERSE to STOPPED
I (32973) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 2 to 1
I (32973) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from STOPPED to IDLE
I (36423) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 1 to 8
I (36423) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from IDLE to TILT_REVERSE
I (41153) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 8 to 1
I (41153) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from TILT_REVERSE to IDLE
I (47113) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 1 to 7
I (47113) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from IDLE to TILT_FORWARD
I (51913) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_1: Defining new indicator mode for #0 and state change from 7 to 1
I (51913) RELAY_CHN_SINGLE_EXAMPLE: example_event_listener_2: State change for #0, from TILT_FORWARD to IDLE
```