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| 商品簡介 |
EXT.IO 是一款並行端口拓展器，集成了IO拓展晶片PCA9554PW,支持拓展至8個GPIO，能夠用於用於2.3~5.5V VCC、開漏、上拉、中斷輸出操作.通過I2C接口（串行時鐘SCL,串行數據SDA）輔助多數的微控制器提供I/0拓展，對於I/O引腳緊缺，又不想浪費資源添加額外控制器的開發者來說，EXT.IO會是一個不錯輔助Unit。
● I2C通訊
● 輸入輸出拓展
● GROVE 接口, 支持 UIFlow 、 Arduino
● 2x LEGO 兼容孔
| 商品規格 |
| 規格 | 參數 |
| IIC地址 | 0x27 |
| I/O擴展數量 | 8 |
| 淨重 | 5g |
| 產品尺寸 | 32x 24x 11 (mm) |
| 電路圖 |
參考原理圖及PCA9554PW數據手冊可知，該Unit能夠通過控制A0~A2引腳的電平組合，修改設備的I2C地址。 (默認地址為0x27，更多信息請查看datasheet) 在Unit的PCB板上預留了三個貼片電阻焊接位，分別為A0-A2(R6-R8)，如下圖所示。
| 相關連結 |
Datasheet - PCA9554PW
| EasyLoader |
| 管腳映射 |
| M5Core(GROVE A) | GPIO22 | GPIO21 | 5V | GND |
| EXT.IO Unit | SCL | SDA | 5V | GND |
| 範例程式 |
| 如何查詢I2C位址 |
STEP 1. 將欲查詢的模組連接至Arduino UNO（附圖為腳位參考，實際請比對商品標示接線）
STEP 2. 開啟Arduino IDE並新增檔案
STEP 3. 貼入教學下方的範例文件，並上傳到Arduino UNO，即會開始掃描I2C位址
STEP 4. 開啟序列埠監控視窗，即可取得I2C位址
| / ---------------------------------------------------------------- / | |
| // Arduino I2C Scanner | |
| // Re-writed by Arbi Abdul Jabbaar | |
| // Using Arduino IDE 1.8.7 | |
| // Using GY-87 module for the target | |
| // Tested on 10 September 2019 | |
| // This sketch tests the standard 7-bit addresses | |
| // Devices with higher bit address might not be seen properly. | |
| / ---------------------------------------------------------------- / | |
| #include |
|
| void setup() | |
| { | |
| Wire.begin(); // Wire communication begin | |
| Serial.begin(9600); // The baudrate of Serial monitor is set in 9600 | |
| while (!Serial); // Waiting for Serial Monitor | |
| Serial.println("\nI2C Scanner"); | |
| } | |
| void loop() | |
| { | |
| byte error, address; //variable for error and I2C address | |
| int nDevices; | |
| Serial.println("Scanning..."); | |
| nDevices = 0; | |
| for (address = 1; address < 127; address++ ) | |
| { | |
| // The i2c_scanner uses the return value of | |
| // the Write.endTransmisstion to see if | |
| // a device did acknowledge to the address. | |
| Wire.beginTransmission(address); | |
| error = Wire.endTransmission(); | |
| if (error == 0) | |
| { | |
| Serial.print("I2C device found at address 0x"); | |
| if (address < 16) | |
| Serial.print("0"); | |
| Serial.print(address, HEX); | |
| Serial.println(" !"); | |
| nDevices++; | |
| } | |
| else if (error == 4) | |
| { | |
| Serial.print("Unknown error at address 0x"); | |
| if (address < 16) | |
| Serial.print("0"); | |
| Serial.println(address, HEX); | |
| } | |
| } | |
| if (nDevices == 0) | |
| Serial.println("No I2C devices found\n"); | |
| else | |
| Serial.println("done\n"); | |
| delay(5000); // wait 5 seconds for the next I2C scan | |
| } |
| 出貨清單 |