From 8043ed02c422d33d36c806c48c4923172c086367 Mon Sep 17 00:00:00 2001
From: rintyuu <me@rintyuu.uk>
Date: Fri, 31 May 2024 22:41:38 -0700
Subject: [PATCH] add files
---
random variables/README.md | 10 +++
random variables/esp32_esp-now_tx.ino | 105 ++++++++++++++++++++++++
random variables/esp8266_esp-now_rx.ino | 52 ++++++++++++
3 files changed, 167 insertions(+)
create mode 100644 random variables/README.md
create mode 100644 random variables/esp32_esp-now_tx.ino
create mode 100644 random variables/esp8266_esp-now_rx.ino
diff --git a/random variables/README.md b/random variables/README.md
new file mode 100644
index 0000000..1a74a2d
--- /dev/null
+++ b/random variables/README.md
@@ -0,0 +1,10 @@
+# random variables demo
+make sure you input the correct mac address in line 8 of the tx file.
+
+`uint8_t receiverMACAddress[] = {0x08, 0xF9, 0xE0, 0x6C, 0x75, 0x84};`
+
+you dont necessarily need an esp32 or esp8266 to use these files, im too lazy to rename them, and thats the boards that i used that i know works with the code, because i totally coded them.
+
+in the esp32 tx file, i used an ssd1306 128x64 oled display, if you dont have one of these, use your brain or ai to remove the display code.
+
+in the rx file, theres nothing special about it.
\ No newline at end of file
diff --git a/random variables/esp32_esp-now_tx.ino b/random variables/esp32_esp-now_tx.ino
new file mode 100644
index 0000000..6dfb585
--- /dev/null
+++ b/random variables/esp32_esp-now_tx.ino
@@ -0,0 +1,105 @@
+#include <esp_now.h>
+#include <WiFi.h>
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+// Define the MAC address of the receiver (ESP8266)
+uint8_t receiverMACAddress[] = {0x08, 0xF9, 0xE0, 0x6C, 0x75, 0x84};
+
+// Structure to send data
+typedef struct struct_message {
+ char a[32];
+ int b;
+ float c;
+ bool d;
+} struct_message;
+
+// Create a struct_message called myData
+struct_message myData;
+
+// OLED display width and height, in pixels
+#define SCREEN_WIDTH 128
+#define SCREEN_HEIGHT 64
+
+// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
+#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
+
+// Callback function when data is sent
+void onDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
+ Serial.print("\r\nLast Packet Send Status: ");
+ String statusMessage = status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail";
+ Serial.println(statusMessage);
+
+ // Update the display with the status message
+ display.clearDisplay();
+ display.setTextSize(1); // Normal 1:1 pixel scale
+ display.setTextColor(SSD1306_WHITE); // Draw white text
+ display.setCursor(0, 0);
+ display.println(statusMessage);
+ display.display();
+}
+
+void setup() {
+ // Initialize Serial Monitor
+ Serial.begin(115200);
+
+ // Initialize OLED display
+ if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
+ Serial.println(F("SSD1306 allocation failed"));
+ for(;;);
+ }
+ display.display();
+ delay(2000); // Pause for 2 seconds
+
+ // Clear the buffer
+ display.clearDisplay();
+
+ // Set device as a Wi-Fi Station
+ WiFi.mode(WIFI_STA);
+
+ // Init ESP-NOW
+ if (esp_now_init() != ESP_OK) {
+ Serial.println("Error initializing ESP-NOW");
+ return;
+ }
+
+ // Register send callback
+ esp_now_register_send_cb(onDataSent);
+
+ // Register peer
+ esp_now_peer_info_t peerInfo;
+ memset(&peerInfo, 0, sizeof(peerInfo));
+ memcpy(peerInfo.peer_addr, receiverMACAddress, 6);
+ peerInfo.channel = 0;
+ peerInfo.encrypt = false;
+
+ // Add peer
+ if (esp_now_add_peer(&peerInfo) != ESP_OK) {
+ Serial.println("Failed to add peer");
+ return;
+ }
+
+ // Seed random number generator
+ randomSeed(analogRead(0));
+}
+
+void loop() {
+ // Generate random values
+ snprintf(myData.a, sizeof(myData.a), "Value: %d", random(0, 1000));
+ myData.b = random(0, 100);
+ myData.c = random(0, 1000) / 100.0;
+ myData.d = random(0, 2);
+
+ // Send message via ESP-NOW
+ esp_err_t result = esp_now_send(receiverMACAddress, (uint8_t *) &myData, sizeof(myData));
+
+ if (result == ESP_OK) {
+ Serial.println("Sent with success");
+ } else {
+ Serial.println("Error sending the data");
+ }
+
+ delay(2000);
+}
diff --git a/random variables/esp8266_esp-now_rx.ino b/random variables/esp8266_esp-now_rx.ino
new file mode 100644
index 0000000..41b9053
--- /dev/null
+++ b/random variables/esp8266_esp-now_rx.ino
@@ -0,0 +1,52 @@
+#include <ESP8266WiFi.h>
+extern "C" {
+ #include <espnow.h>
+}
+
+// Structure to receive data
+typedef struct struct_message {
+ char a[32];
+ int b;
+ float c;
+ bool d;
+} struct_message;
+
+struct_message myData;
+
+// Callback function that will be executed when data is received
+void onDataRecv(uint8_t * mac, uint8_t *incomingData, uint8_t len) {
+ memcpy(&myData, incomingData, sizeof(myData));
+ Serial.print("Bytes received: ");
+ Serial.println(len);
+ Serial.print("Char: ");
+ Serial.println(myData.a);
+ Serial.print("Int: ");
+ Serial.println(myData.b);
+ Serial.print("Float: ");
+ Serial.println(myData.c);
+ Serial.print("Bool: ");
+ Serial.println(myData.d);
+}
+
+void setup() {
+ // Initialize Serial Monitor
+ Serial.begin(115200);
+
+ // Set device as a Wi-Fi Station
+ WiFi.mode(WIFI_STA);
+ WiFi.disconnect();
+
+ // Init ESP-NOW
+ if (esp_now_init() != 0) {
+ Serial.println("Error initializing ESP-NOW");
+ return;
+ }
+
+ // Register for a callback function that will be called when data is received
+ esp_now_set_self_role(ESP_NOW_ROLE_SLAVE);
+ esp_now_register_recv_cb(onDataRecv);
+}
+
+void loop() {
+ // Nothing to do here
+}