From 611cde59f8363a27adef7b9ae845eb4e46e59102 Mon Sep 17 00:00:00 2001
From: "Misael.K" <MisaelK@users.noreply.github.com>
Date: Fri, 27 Sep 2024 21:59:43 -0300
Subject: [PATCH] Add scan_i2c and read_mac helpers

---
 esp32_espnow/helpers/read_mac/read_mac.ino | 35 +++++++++++++++
 esp32_espnow/helpers/scan_i2c/scan_i2c.ino | 50 ++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 esp32_espnow/helpers/read_mac/read_mac.ino
 create mode 100644 esp32_espnow/helpers/scan_i2c/scan_i2c.ino

diff --git a/esp32_espnow/helpers/read_mac/read_mac.ino b/esp32_espnow/helpers/read_mac/read_mac.ino
new file mode 100644
index 0000000..7b61e33
--- /dev/null
+++ b/esp32_espnow/helpers/read_mac/read_mac.ino
@@ -0,0 +1,35 @@
+/*
+  Rui Santos & Sara Santos - Random Nerd Tutorials
+  Complete project details at https://RandomNerdTutorials.com/get-change-esp32-esp8266-mac-address-arduino/
+  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.  
+  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+*/
+#include <WiFi.h>
+#include <esp_wifi.h>
+
+void readMacAddress(){
+  uint8_t baseMac[6];
+  esp_err_t ret = esp_wifi_get_mac(WIFI_IF_STA, baseMac);
+  if (ret == ESP_OK) {
+    Serial.printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
+                  baseMac[0], baseMac[1], baseMac[2],
+                  baseMac[3], baseMac[4], baseMac[5]);
+  } else {
+    Serial.println("Failed to read MAC address");
+  }
+}
+
+void setup(){
+  Serial.begin(115200);
+
+  WiFi.mode(WIFI_STA);
+  WiFi.STA.begin();
+}
+ 
+void loop(){
+
+  Serial.print("[DEFAULT] ESP32 Board MAC Address: ");
+  readMacAddress();
+  delay(1000);
+
+}
diff --git a/esp32_espnow/helpers/scan_i2c/scan_i2c.ino b/esp32_espnow/helpers/scan_i2c/scan_i2c.ino
new file mode 100644
index 0000000..4eced92
--- /dev/null
+++ b/esp32_espnow/helpers/scan_i2c/scan_i2c.ino
@@ -0,0 +1,50 @@
+// error 5 at address 0x3B
+
+#include <Wire.h>
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("SETUP");
+  
+  Wire.setClock(100000);
+  delay(50);
+  Wire.begin(21, 22, 100000); // sda, sdl, freq
+  delay(50);
+  Wire.setTimeout(50000); //us
+}
+
+void loop() {
+  byte error, address;
+  int nDevices;
+
+  Serial.println("Scanning...");
+  nDevices = 0;
+  for (address = 1; address <= 127; address++ ) {
+    Wire.beginTransmission(address);
+    error = Wire.endTransmission(true);
+    if (error == 0) {
+      Serial.print("I2C device found at address 0x");
+      if (address < 16) Serial.print("0");
+      Serial.println(address, HEX);
+      nDevices++;
+    } else if (error == 2) {
+      // ignore
+    } else if (error == 4) {
+      Serial.print("Unknown error at address 0x");
+      if (address < 16) Serial.print("0");
+      Serial.println(address, HEX);
+    } else {
+      Serial.print("error ");
+      Serial.print(error);
+      Serial.print(" 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(1000);
+}