"The Workhorse of Mesh Networks - Reliable, Powerful, and Seductive"
The Heltec WiFi LoRa 32 V3 is an ESP32-S3 based board with integrated LoRa (SX1262) and OLED display (128x64). This is the workhorse of the WetMesh network - reliable, well-documented, and easy to work with. Unlike the Tracker, this board's power control is straightforward and just works! ๐
Function | GPIO Pin | Description |
---|---|---|
LORA_CS |
8 | Chip Select (NSS) |
LORA_INT |
14 | DIO1 interrupt |
LORA_RST |
12 | Reset |
LORA_BUSY |
13 | Busy signal (SX1262 specific) |
SPI: SCK=9, MISO=11, MOSI=10 |
Function | GPIO Pin | Description |
---|---|---|
OLED_SDA |
17 | I2C Data |
OLED_SCL |
18 | I2C Clock |
OLED_RST |
21 | Reset pin |
I2C Address |
0x3C | Fixed address |
Function | GPIO Pin | Description |
---|---|---|
LED_PIN |
35 | White LED on board |
VEXT_PIN |
36 | Display power (LOW=ON, HIGH=OFF) |
LOW = Power ON
HIGH = Power ON
#include <U8g2lib.h> // Create display object for Heltec V3 - ready to seduce! ๐ U8G2_SSD1306_128X64_NONAME_F_HW_I2C display( U8G2_R0, // Rotation OLED_RST, // Reset pin (21) OLED_SCL, // Clock pin (18) OLED_SDA // Data pin (17) ); void initDisplay() { // Power on display via Vext - the foreplay pinMode(VEXT_PIN, OUTPUT); digitalWrite(VEXT_PIN, LOW); // LOW = ON for Heltec V3 (intuitive!) delay(50); // Let it wake up and get ready // Initialize display - time to show off display.begin(); display.clearBuffer(); display.setFont(u8g2_font_6x10_tf); display.drawStr(0, 10, "WetMesh v5H"); display.drawStr(0, 25, "Ready to seduce!"); display.drawStr(0, 40, "( . )( . )"); // Our signature! display.sendBuffer(); }
Good resolution for text and simple graphics - perfect for mesh status!
White pixels, high contrast - crisp and seductive!
100+ FPS possible - smooth animations that tease!
~20mA when on, <1ยตA when off - efficient pleasure!
// Small (6x10) - Good for status lines and whispers u8g2_font_6x10_tf // Medium (7x14) - Good for main text and sweet nothings u8g2_font_7x14_tf // Large (10x20) - Good for important values that demand attention u8g2_font_10x20_tf // Bold fonts for emphasis - when you need to shout! ๐ u8g2_font_courB18_tf // Courier Bold 18pt u8g2_font_courB24_tf // Courier Bold 24pt - BIG and BOLD!
#include <RadioLib.h> // Create SPI instance - spreading those signals SPIClass hspi(HSPI); SPISettings spiSettings(2000000, MSBFIRST, SPI_MODE0); // Create radio instance - ready to transmit pleasure SX1262 radio = new Module(LORA_CS, LORA_INT, LORA_RST, LORA_BUSY, hspi, spiSettings); void initLoRa() { // Initialize SPI - the connection begins hspi.begin(9, 11, 10, 8); // SCK, MISO, MOSI, CS // Configure radio - tune it just right ๐ int state = radio.begin( 915.0, // Frequency (MHz) - US band 125.0, // Bandwidth (kHz) - nice and wide 9, // Spreading Factor - spread it good 7, // Coding Rate (4/7) - error protection 0x69, // Sync Word - nice ๐ 20, // Output Power (dBm) - full power! 10, // Preamble Length 0, // TCXO Voltage (0 = not used) false // Use DCDC regulator ); if (state == RADIOLIB_ERR_NONE) { Serial.println("LoRa initialized! Ready to spread signals!"); } // Set CRC and other parameters for reliability radio.setCRC(true); radio.setDio1Action(onReceive); // Interrupt handler for instant gratification }
915 MHz (US), 868 MHz (EU), 433 MHz (Asia) - pick your region!
125 kHz - good balance of range and speed for mesh pleasure
SF9 - SF7-12, higher = longer range but slower teasing
4/7 - more redundancy = better error correction
0x69 - must match for networks to communicate (nice! ๐)
20 dBm max (100mW) for SX1262 - full power seduction!
#include <Arduino.h> #include <RadioLib.h> #include <U8g2lib.h> // Pin definitions - the anatomy of pleasure ๐ #define LORA_CS 8 #define LORA_INT 14 #define LORA_RST 12 #define LORA_BUSY 13 #define LED_PIN 35 #define VEXT_PIN 36 #define OLED_RST 21 #define OLED_SCL 18 #define OLED_SDA 17 // Objects - our tools of seduction U8G2_SSD1306_128X64_NONAME_F_HW_I2C display(U8G2_R0, OLED_RST, OLED_SCL, OLED_SDA); SPIClass hspi(HSPI); SX1262 radio = new Module(LORA_CS, LORA_INT, LORA_RST, LORA_BUSY, hspi); void setup() { Serial.begin(115200); Serial.println("Heltec V3 starting up... ( โข )( โข )"); // Initialize LED - let there be light! pinMode(LED_PIN, OUTPUT); digitalWrite(LED_PIN, HIGH); // ON - we're alive! // Power on display - time to show off pinMode(VEXT_PIN, OUTPUT); digitalWrite(VEXT_PIN, LOW); // LOW = ON (intuitive!) delay(50); // Initialize display - visual seduction begins display.begin(); display.clearBuffer(); display.setFont(u8g2_font_7x14_tf); display.drawStr(0, 12, "Heltec V3"); display.drawStr(0, 28, "Initializing..."); display.drawStr(0, 44, "( . )( . )"); // Our signature! display.sendBuffer(); // Initialize LoRa - spread those signals hspi.begin(9, 11, 10, 8); int state = radio.begin(915.0, 125.0, 9, 7, 0x69, 20); if (state == RADIOLIB_ERR_NONE) { display.drawStr(0, 60, "LoRa OK! Ready!"); Serial.println("LoRa initialized successfully!"); } else { display.drawStr(0, 60, "LoRa FAIL!"); Serial.println("LoRa initialization failed!"); } display.sendBuffer(); digitalWrite(LED_PIN, LOW); // OFF - ready for action } void loop() { // Your mesh network pleasure code here ๐ // The V3 is ready to seduce and be seduced! }
// Power ON display - wake up and show off digitalWrite(VEXT_PIN, LOW); // Power OFF display - rest after climax (saves ~20mA) digitalWrite(VEXT_PIN, HIGH);
void enterDeepSleep(uint32_t seconds) { // Turn off display - lights out ๐ digitalWrite(VEXT_PIN, HIGH); // Configure wake up source - set the alarm esp_sleep_enable_timer_wakeup(seconds * 1000000ULL); // Enter deep sleep - sweet dreams esp_deep_sleep_start(); }
Mode | Current Draw | Description |
---|---|---|
Active (TX) | ~120mA @ 20dBm | Full power transmission |
Active (RX) | ~45mA | Listening for signals |
Display ON | ~20mA | Visual seduction active |
Display OFF | ~25mA | Radio only |
Deep Sleep | ~10ยตA | Resting after pleasure |
The WetMesh firmware rotates through multiple screens for maximum information pleasure!
enum DisplayScreen { SCREEN_STATUS = 0, // Current state and partner info SCREEN_STATS, // Messages sent/received SCREEN_NETWORK, // Neighbor list and RSSI SCREEN_MESSAGES, // Recent activity log NUM_SCREENS }; DisplayScreen currentScreen = SCREEN_STATUS; uint32_t lastScreenSwitch = 0; const uint32_t SCREEN_DURATION = 5000; // 5 seconds of viewing pleasure void updateDisplay() { // Auto-rotate screens for continuous teasing if (millis() - lastScreenSwitch > SCREEN_DURATION) { currentScreen = (DisplayScreen)((currentScreen + 1) % NUM_SCREENS); lastScreenSwitch = millis(); } display.clearBuffer(); switch(currentScreen) { case SCREEN_STATUS: drawStatusScreen(); break; case SCREEN_STATS: drawStatsScreen(); break; case SCREEN_NETWORK: drawNetworkScreen(); break; case SCREEN_MESSAGES: drawMessagesScreen(); break; } display.sendBuffer(); }
5 seconds per screen - steady rhythm
15 seconds on partner screen - savoring the moment
10ms update cycle for smooth, seductive animations
Solutions:
Solutions:
Solutions:
Solutions:
// In setup() - identify yourself! ๐ #ifdef WIFI_LoRa_32_V3 const char* boardType = "Heltec V3"; #define HAS_OLED 1 #define HAS_LED 1 // Ready for mesh pleasure! #endif
// LED states for mesh network - visual feedback is sexy! void updateLED() { switch(currentState) { case ALONE: digitalWrite(LED_PIN, LOW); // OFF - lonely break; case FLIRTING: pulseLED(500); // Slow pulse - getting interested ๐ break; case ORGY: pulseLED(200); // Fast pulse - group fun! break; case CLIMAX: strobeLED(50); // Rapid flash - peak pleasure! break; case RESTING: digitalWrite(LED_PIN, LOW); // OFF - recovery break; } }
clearBuffer()
and sendBuffer()
for flicker-free updatesStaticJsonDocument<256>
for small messages// Implement frequency hopping for interference avoidance - stay agile! ๐ const float frequencies[] = {915.0, 915.5, 916.0, 916.5, 917.0}; int currentFreq = 0; void hopFrequency() { currentFreq = (currentFreq + 1) % 5; radio.setFrequency(frequencies[currentFreq]); // Keep them guessing! }
// Adjust SF based on RSSI for optimal speed - smart seduction! void adaptDataRate(int rssi) { if (rssi > -70) { radio.setSpreadingFactor(7); // Close range, fast and furious } else if (rssi > -90) { radio.setSpreadingFactor(9); // Medium range, steady rhythm } else { radio.setSpreadingFactor(11); // Long range, slow and teasing } }
The Heltec WiFi LoRa 32 V3 is the most straightforward board in the WetMesh ecosystem:
This board is perfect for fixed mesh nodes and is the recommended starting point for WetMesh development! Our technical cleavage approves! ( โข )( โข ) ๐