cpp 
/*
 *SPDX-FileCopyrightText: 2025 M5Stack Technology CO LTD
 *
 *SPDX-License-Identifier: MIT
 */
#include <Arduino.h>
#include <M5StamPLC.h>

void setup()
{
    /* Init M5StamPLC */
    M5StamPLC.begin();
}

void loop()
{
    static bool relay_state = false;

    /* Toggle relay state */
    relay_state = !relay_state;
    for (int i = 0; i < 4; i++) {
        M5StamPLC.writePlcRelay(i, relay_state);
        printf("Write Relay %d to %s\n", i, relay_state ? "ON" : "OFF");
        delay(500);
    }

    delay(1000);
}

Relay API

writePlcRelay

函数原型:

void writePlcRelay(const uint8_t& channel, const bool& state); 

功能说明:

控制写入指定编号继电器状态

传入参数:

const uint8_t& channel：
- 0-3
const bool& state
- true: ON
- false: OFF

返回值:

null

writePlcAllRelay

函数原型:

void writePlcAllRelay(const uint8_t& relayState); 

功能说明:

控制写入指定编号继电器状态

传入参数:

const uint8_t& relayState
- bit[0:3] -> channel[0:3]
- bit == 1: ON
- bit == 0: OFF

返回值:

null

readPlcRelay

函数原型:

bool readPlcRelay(const uint8_t& channel); 

功能说明:

读取指定编号继电器状态

传入参数:

const uint8_t& channel：
- 0-3

返回值:

bool:
- true: ON
- false: OFF

Input 案例程序

cpp 
/*
 *SPDX-FileCopyrightText: 2025 M5Stack Technology CO LTD
 *
 *SPDX-License-Identifier: MIT
 */
#include <Arduino.h>
#include <M5StamPLC.h>

void setup()
{
    /* Init M5StamPLC */
    M5StamPLC.begin();
}

void loop()
{
    static std::array<bool, 8> input_list;

    // Read inputs
    for (int i = 0; i < 8; i++) {
        input_list[i] = M5StamPLC.readPlcInput(i);
    }

    // Print input reading result
    printf("Input: %d, %d, %d, %d, %d, %d, %d, %d\n", input_list[0], input_list[1], input_list[2], input_list[3],
           input_list[4], input_list[5], input_list[6], input_list[7]);

    delay(1000);
}

Input API

readPlcInput

函数原型:

bool readPlcInput(const uint8_t& channel); 

功能说明:

读取指定编号输入信号状态

传入参数:

const uint8_t& channel：
- channel 0-7

返回值:

bool:
- true: HIGH
- false: LOW

Next 1. Arduino 环境配置 - 1. Arduino IDE 安装