Mcp23017 - Versijų istorija

\dev\null 08:58, 26 lapkričio 2022

2022-11-26T08:58:17Z

\dev\null 08:54, 26 lapkričio 2022

2022-11-26T08:54:44Z

\dev\null 00:37, 26 lapkričio 2022

2022-11-26T00:37:44Z

\dev\null 00:37, 26 lapkričio 2022

2022-11-26T00:37:01Z

\dev\null: Naujas puslapis: 300px 600px This port expander provides you 16 more GPIOs and cost you around 1€. And be...

2022-11-26T00:31:14Z

Naujas puslapis: 300px 600px This port expander provides you 16 more GPIOs and cost you around 1€. And be...

Naujas puslapis

[[Vaizdas:Mcp23017-pinout.jpg.webp|300px]]

[[Vaizdas:Mcp23017-and-8-leds schem.png-2.webp|600px]]

This port expander provides you 16 more GPIOs and cost you around 1€. And because it communicates via I²C it only uses two GPIOs of your ESP8266 and you can address up to 8 MCP23017. That makes up to 126 additional GPIOs.

= ESP32 Wiring =

* SDA -> GPIO5
* SCL -> GPIO4
* VSS -> GND
* VDD -> VIN
* 17 -> GND
* 16 -> GND
* 15 -> GND

= ESP8266 =

https://medium.com/@wilko.vehreke/more-gpios-for-the-esp8266-with-the-mcp23017-b89f5e15cde3

[[Category:Hardware]]
[[Cateogry:ESP32]]
[[Category:ESP8266]]

← Ankstesnė versija		08:58, 26 lapkričio 2022 versija
6 eilutė:		6 eilutė:

	= ESP32 Wiring =		= ESP32 Wiring =
		+
		+	[[Vaizdas:D8fddce06241296363242bc44a0fffc8804a5295 2 641x500.jpg]]
		+	[[Vaizdas:Esquema.png]]

	* Board 3.3V output to MCP23017 Vdd		* Board 3.3V output to MCP23017 Vdd

@@ 7 eilutė: / 7 eilutė: @@
 = ESP32 Wiring =
-* SDA -> pin 21
+* Board 3.3V output to MCP23017 Vdd
-* SCL -> pin 22
+* Board ground/GND to MCP23017 Vss
-* VSS -> GND
+* Board SCL (pin 22) to MCP23017 SCL
-* VDD -> VIN
+* Board SDA (pin 21) to MCP23017 SDA
-* 17 -> GND
+* MCP23017 SCL to 4.7 KΩ resistor connected to 3.3V
-* 16 -> GND
+* MCP23017 SDA to 4.7 KΩ resistor connected to 3.3V
-* 15 -> GND
+* MCP23017 A0 to ground
 <Syntaxhighlight lang="cpp">
 #include <Wire.h>
 void setup()
+void setup() {
-Serial.begin (115200);
+  Wire.begin();
-Wire.begin (21, 22); // sda= GPIO_21 /scl= GPIO_22
+  Serial.begin(115200);
+}
-void Scanner ()
+void loop() {
-Serial.println ();
+  byte error, address;
-Serial.println ("I2C scanner. Scanning ...");
+  int nDevices;
-byte count = 0;
+  Serial.println("Scanning...");
-Wire.begin();
+  nDevices = 0;
-for (byte i = 8; i < 120; i++)
+  for(address = 1; address < 127; address++ ) {
+    Wire.beginTransmission(address);
-Wire.beginTransmission (i); // Begin I2C transmission Address (i)
+    error = Wire.endTransmission();
-if (Wire.endTransmission () == 0) // Receive 0 = success (ACK response)
+    if (error == 0) {
+      Serial.print("I2C device found at address 0x");
-Serial.print ("Found address: ");
+      if (address<16) {
-Serial.print (i, DEC);
+        Serial.print("0");
-Serial.print (" (0x");
-Serial.print (i, HEX); // PCF8574 7 bit address
+      Serial.println(address,HEX);
-Serial.println (")");
+      nDevices++;
-count++;
+}
+}
-Serial.print ("Found ");
-Serial.print (count, DEC); // numbers of devices
+void loop() {
-Serial.println (" device(s).");
+  Serial.println("Turn on");
+  mcp.digitalWrite(LED_PIN, HIGH);
-void loop()
+  delay(1000);
+  Serial.println("Turn off");
-Scanner ();
+  mcp.digitalWrite(LED_PIN, LOW);
-delay (100);
+  delay(1000);
+}
 </syntaxhighlight>

← Ankstesnė versija		00:37, 26 lapkričio 2022 versija
15 eilutė:		15 eilutė:
	* 15 -> GND		* 15 -> GND

		+	<Syntaxhighlight lang="cpp">
		+	// ESP32 I2C Scanner
		+	// Based on code of Nick Gammon http://www.gammon.com.au/forum/?id=10896
		+	// ESP32 DevKit - Arduino IDE 1.8.5
		+	// Device tested PCF8574 - Use pullup resistors 3K3 ohms !
		+	// PCF8574 Default Freq 100 KHz
		+	#include <Wire.h>
		+	void setup()
		+	{
		+	Serial.begin (115200);
		+	Wire.begin (21, 22); // sda= GPIO_21 /scl= GPIO_22
		+	}
		+	void Scanner ()
		+	{
		+	Serial.println ();
		+	Serial.println ("I2C scanner. Scanning ...");
		+	byte count = 0;
		+	Wire.begin();
		+	for (byte i = 8; i < 120; i++)
		+	{
		+	Wire.beginTransmission (i); // Begin I2C transmission Address (i)
		+	if (Wire.endTransmission () == 0) // Receive 0 = success (ACK response)
		+	{
		+	Serial.print ("Found address: ");
		+	Serial.print (i, DEC);
		+	Serial.print (" (0x");
		+	Serial.print (i, HEX); // PCF8574 7 bit address
		+	Serial.println (")");
		+	count++;
		+	}
		+	}
		+	Serial.print ("Found ");
		+	Serial.print (count, DEC); // numbers of devices
		+	Serial.println (" device(s).");
		+	}
		+	void loop()
		+	{
		+	Scanner ();
		+	delay (100);
		+	}
		+	</syntaxhighlight>

	= ESP8266 =		= ESP8266 =

@@ 7 eilutė: / 7 eilutė: @@
 = ESP32 Wiring =
-* SDA -> GPIO5
+* SDA -> pin 21
-* SCL -> GPIO4
+* SCL -> pin 22
 * VSS -> GND
 * VDD -> VIN
@@ 21 eilutė: / 21 eilutė: @@
 [[Category:Hardware]]
-[[Cateogry:ESP32]]
+[[Category:ESP32]]
 [[Category:ESP8266]]