Hi all,
I'm trying to connect a RFD reader MFRC522 to a MKRZERO board. After some digging, I have the 2 following questions:
-
GPIO0 in ESP8266 (or D3 in Wemos D1 mini) to what PIN on MKRZERO is equivalent? As you can see in the following code, I need to change the "RST_PIN D3" (for Wemos D1 mini) to the corresponding value for the MKRZERO, and I'm a bit lost there.
-
Also, I'm not sure how to define it on the code. The original code states:
#define RST_PIN D3 // RST-PIN GPIO4
#define SS_PIN D8 // SDA-PIN GPIO2
In MKRZERo the SS_PIN (D8) translates to "11 SDA", but I'm not sure how to define this on the code. Any thougts?
This is the full program (from here):
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <SPI.h>
#include "MFRC522.h"
/* wiring the MFRC522 to ESP8266 (ESP-12)
RST = GPIO4
SDA(SS) = GPIO2
MOSI = GPIO13
MISO = GPIO12
SCK = GPIO14
GND = GND
3.3V = 3.3V
RGB LED Setup
Red LED = D1
Ground = GND
Gr. LED = D2
Blue LED = D0
*/
#define RST_PIN D3 // RST-PIN GPIO4
#define SS_PIN D8 // SDA-PIN GPIO2
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance
// Wifi Connection details
const char* ssid = "xxxxx";
const char* password = "xxxxxx";
const char* mqtt_server = "xxxxxxx";
const char* mqtt_user = "xxxxxxx";
const char* mqtt_password = "xxxxxxxx";
const char* clientID = "RFID";
const char* rfid_topic = "home/rfid";
const int redPin = D1;
const int greenPin = D2;
const int idPin = D0;
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
void setup() {
Serial.begin(115200);
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522
pinMode(redPin, OUTPUT); // Red LED
pinMode(redPin, HIGH);
pinMode(greenPin, OUTPUT); // Green :LED
pinMode(greenPin, HIGH);
pinMode(idPin, OUTPUT); // ID :LED
pinMode(idPin, HIGH);
delay(2);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
// Connect to Wifi
void setup_wifi() {
//Turn off Access Point
WiFi.mode(WIFI_STA);
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
// Check for incoming messages
void callback(char* topic, byte* payload, unsigned int length) {
Serial.println("");
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
char s[20];
sprintf(s, "%s", payload);
if ( (strcmp(topic,"home/alarm")==0))
{
payload[length] = '\0';
String sp = String((char*)payload);
// Alarm is off
if (sp == "disarmed")
{
Serial.println();
Serial.print("Alarm is set to Disarmed");
Serial.println();
off_both_led();
}
// Alarm is Armed Home
else if (sp == "armed_home")
{
Serial.println();
Serial.print("Alarm is set to Armed Home");
Serial.println();
on_green_led();
}
// Alarm is arming
else if (sp == "pending")
{
Serial.println();
Serial.print("Alarm set to Pending");
Serial.println();
on_both_led();
}
// Alarm is Armed Away
else if (sp == "armed_away")
{
Serial.println();
Serial.print("Alarm set to Armed Away");
Serial.println();
on_green_led();
}
// Alarm is Triggered
else if (sp == "triggered")
{
Serial.println();
Serial.print("Alarm is triggered!!");
Serial.println();
on_red_led();
}
}}
/* interpret the ascii digits in[0] and in[1] as hex
* notation and convert to an integer 0..255.
*/
int hex8(byte *in)
{
char c, h;
c = (char)in[0];
if (c <= '9' && c >= '0') { c -= '0'; }
else if (c <= 'f' && c >= 'a') { c -= ('a' - 0x0a); }
else if (c <= 'F' && c >= 'A') { c -= ('A' - 0x0a); }
else return(-1);
h = c;
c = (char)in[1];
if (c <= '9' && c >= '0') { c -= '0'; }
else if (c <= 'f' && c >= 'a') { c -= ('a' - 0x0a); }
else if (c <= 'F' && c >= 'A') { c -= ('A' - 0x0a); }
else return(-1);
return ( h<<4 | c);
}
// Reconnect to wifi if connection lost
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect(clientID, mqtt_user, mqtt_password)) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("home/rfid", "connected");
// ... and resubscribe
client.subscribe("home/alarm");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
// Main functions
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent()) {
delay(50);
return;
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
delay(50);
return;
}
// Show some details of the PICC (that is: the tag/card)
Serial.println("");
Serial.print(F("Card UID:"));
dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
Serial.println();
digitalWrite(idPin, HIGH);
delay(500);
digitalWrite(idPin, LOW);
delay(500);
// Send data to MQTT
String rfidUid = "";
for (byte i = 0; i < mfrc522.uid.size; i++) {
rfidUid += String(mfrc522.uid.uidByte[i] < 0x10 ? "0" : "");
rfidUid += String(mfrc522.uid.uidByte[i], HEX);
}
const char* id = rfidUid.c_str();
client.publish("home/rfid", id);
delay(3000);
}
// LED Loop
void off_both_led(){
Serial.println("Turning off all led");
digitalWrite(greenPin, LOW);
digitalWrite(redPin, LOW);
}
void flash_green_led(){
Serial.println("Flashing Green LED");
digitalWrite(greenPin, LOW);
// Flash 15 times:
for(int i = 0; i < 14; i++)
{
digitalWrite(greenPin, HIGH);
delay(1000);
digitalWrite(greenPin, LOW);
delay(500);
}}
void flash_red_led(){
Serial.println("Flashing Red LED");
digitalWrite(redPin, LOW);
// Flash 20 times:
for(int i = 0; i < 19; i++)
{
digitalWrite(redPin, HIGH);
delay(1000);
digitalWrite(redPin, LOW);
delay(500);
}}
void on_green_led(){
Serial.println("Turning on green led");
digitalWrite(redPin, LOW);
digitalWrite(greenPin, HIGH);
}
void on_red_led(){
Serial.println("Turning on red led");
digitalWrite(greenPin, LOW);
digitalWrite(redPin, HIGH);
}
void on_both_led(){
Serial.println("Turning on both led");
digitalWrite(greenPin, HIGH);
digitalWrite(redPin, HIGH);
}
// Helper routine to dump a byte array as hex values to Serial
void dump_byte_array(byte *buffer, byte bufferSize) {
for (byte i = 0; i < bufferSize; i++) {
Serial.print(buffer[i] < 0x10 ? " 0" : " ");
Serial.print(buffer[i], HEX);
}
}
to see what it is. Your question might become a lot simpler.