Initial commit: mata avispas Arduino code and README
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Padrino
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# mata avispas
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Flyback high voltage generator (≈12 kV output) controlled by an ESP32‑C3.
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Features
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- ESP32‑C3 runs as a Wi‑Fi Access Point (AP) so you can connect directly to it.
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- A simple web server lets you adjust the PWM frequency/duty cycle that drives the XY‑MOS driver.
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- PWM output is generated on a GPIO using the LEDC hardware (high‑resolution, glitch‑free).
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- Safety: the PWM can be disabled via the web page.
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Hardware notes
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- XY‑MOS driver expects a PWM signal (typically 5 V logic) on its INPUT pin.
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- Connect ESP32‑C3 GPIO to XY‑MOS INPUT through a level‑shifter if needed (ESP32‑C3 is 3.3 V tolerant, most XY‑MOS accept 3.3 V).
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- Flyback transformer secondary should be properly insulated and terminated with a high‑voltage diode/Cockcroft‑Walton multiplier if you need DC.
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- Always use proper shielding, grounding, and never touch the output while powered.
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How to build
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1. Install the ESP32 Arduino core (Boards Manager → esp32 by Espressif Systems).
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2. Select "ESP32C3 Dev Module" (or your specific board).
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3. Copy this folder to your Arduino sketchbook or open with PlatformIO/VSCode.
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4. Compile and upload.
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5. After upload, the ESP32‑C3 will start an AP named `MataAvispas_AP` (password `avispas123`).
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6. Connect your phone/laptop to that AP, open a browser to `http://192.168.4.1` and adjust PWM.
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License: MIT – feel free to adapt.
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/*
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* mata avispas – Flyback high voltage generator controller
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* ESP32‑C3 as Access Point + Web server to configure PWM driving an XY‑MOS driver
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*
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* PWM output: GPIO2 (adjustable via LEDC)
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* Web page: http://192.168.4.1
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* AP SSID: MataAvispas_AP
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* AP Password: avispas123
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*
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* The page lets you set:
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* - Frequency (Hz) : 100 – 20000
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* - Duty cycle (%) : 0 – 100
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* - Enable/Disable output
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*
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* Uses the ESP32 Arduino core (https://github.com/espressif/arduino-esp32)
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*/
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#include <WiFi.h>
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#include <WebServer.h>
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// ==== USER SETTINGS ====
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const char* AP_SSID = "MataAvispas_AP";
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const char* AP_PASSWORD = "avispas123";
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const uint8_t PWM_GPIO = 2; // XY‑MOS INPUT pin
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const uint8_t PWM_CHANNEL = 0; // LEDC channel 0
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const uint8_t PWM_RESOLUTION = 10; // 10‑bit resolution => 0‑1023
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// =======================
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WebServer server(80);
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// Current PWM state
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uint32_t pwmFrequency = 1000; // default 1 kHz
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uint32_t pwmDuty = 512; // 50 % of 1023
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bool pwmEnabled = false;
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// HTML page (stored in PROGMEM to save RAM)
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const char INDEX_HTML[] PROGMEM = R"rawliteral(
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<!DOCTYPE html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0, charset=utf-8">
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<title>Mata Avispas – PWM Config</title>
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<style>
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body { font-family: Arial, Helvetica, sans-serif; margin: 20px; background:#f4f4f4; }
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.container { max-width: 480px; margin: auto; background:#fff; padding:20px; box-shadow:0 0 10px rgba(0,0,0,.1); border-radius:8px; }
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h1 { color:#2c3e50; text-align:center; }
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label { display:block; margin-top:15px; font-weight:bold; }
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input[type="number"], input[type="range"] { width:100%; padding:8px; margin-top:5px; }
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.btn { display:inline-block; margin-top:20px; padding:10px 20px; background:#27ae60; color:#fff; border:none; border-radius:4px; cursor:pointer; }
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.btn.disabled { background:#95a5a6; cursor:not-allowed; }
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.status { margin-top:15px; padding:10px; background:#ecf0f1; border-radius:4px; }
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</style>
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</head>
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<body>
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<div class="container">
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<h1>Mata Avispas</h1>
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<div class="status" id="status">PWM: <span id="pwmState">OFF</span></div>
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<label for="freq">Frequency (Hz)</label>
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<input type="number" id="freq" min="100" max="20000" value="1000">
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<small>Range: 100 – 20000 Hz</small>
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<label for="duty">Duty cycle (%)</label>
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<input type="range" id="duty" min="0" max="100" value="50">
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<span id="dutyVal">50</span>%
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<label for="enable">Output</label>
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<select id="enable">
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<option value="0">Disabled</option>
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<option value="1">Enabled</option>
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</select>
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<button class="btn" id="sendBtn">Apply Settings</button>
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</div>
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<script>
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const freqIn = document.getElementById('freq');
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const dutyIn = document.getElementById('duty');
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const dutyVal = document.getElementById('dutyVal');
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const enableIn = document.getElementById('enable');
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const btn = document.getElementById('sendBtn');
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const status = document.getElementById('status');
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const pwmState = document.getElementById('pwmState');
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dutyIn.addEventListener('input', () => {
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dutyVal.textContent = dutyIn.value;
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});
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btn.addEventListener('click', () => {
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const data = {
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freq: parseInt(freqIn.value),
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duty: parseInt(dutyIn.value),
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en: parseInt(enableIn.value)
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};
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fetch('/set', {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify(data)
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})
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.then(r => r.json())
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.then(resp => {
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if (resp.ok) {
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pwmState.textContent = resp.enabled ? 'ON' : 'OFF';
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status.innerHTML = `PWM: <strong>${resp.enabled ? 'ON' : 'OFF'}</strong> (freq: ${resp.freq} Hz, duty: ${resp.duty}%)`;
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status.style.background = resp.enabled ? '#dff0d8' : '#f2dede';
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} else {
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alert('Error: ' + resp.msg);
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}
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})
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.catch(err => {
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alert('Network error: ' + err);
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});
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});
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// Load current settings on page load
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window.addEventListener('load', () => {
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fetch('/get')
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.then(r => r.json())
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.then(data => {
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freqIn.value = data.freq;
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dutyIn.value = data.duty;
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dutyVal.textContent = data.duty;
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enableIn.value = data.enabled ? '1' : '0';
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pwmState.textContent = data.enabled ? 'ON' : 'OFF';
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status.innerHTML = `PWM: <strong>${data.enabled ? 'ON' : 'OFF'}</strong> (freq: ${data.freq} Hz, duty: ${data.duty}%)`;
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status.style.background = data.enabled ? '#dff0d8' : '#f2dede';
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});
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});
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</script>
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</body>
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</html>
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)rawliteral";
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void handleRoot() {
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server.send_P(200, "text/html", INDEX_HTML, strlen_P(INDEX_HTML));
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}
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void handleGet() {
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String json = "{";
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json += "\"freq\":" + String(pwmFrequency) + ",";
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json += "\"duty\":" + String(map(pwmDuty, 0, (1<<PWM_RESOLUTION)-1, 0, 100)) + ",";
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json += "\"enabled\":" + String(pwmEnabled ? "true" : "false");
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json += "}";
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server.send(200, "application/json", json);
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}
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void handleSet() {
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if (server.method() != HTTP_POST) {
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server.send(405, "text/plain", "Method Not Allowed");
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return;
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}
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if (!server.hasArg("plain")) {
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server.send(400, "text/plain", "Missing JSON body");
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return;
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}
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String body = server.arg("plain");
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// Very simple JSON parsing (expects {"freq":N,"duty":M,"en":0|1})
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int freq = 1000;
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int duty = 50;
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int en = 0;
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int idx = body.indexOf("\"freq\":");
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if (idx >= 0) {
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String sub = body.substring(idx + 7);
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freq = sub.substring(0, sub.indexOf(",")).toInt();
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}
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idx = body.indexOf("\"duty\":");
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if (idx >= 0) {
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String sub = body.substring(idx + 7);
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duty = sub.substring(0, sub.indexOf(",")).toInt();
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}
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idx = body.indexOf("\"en\":");
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if (idx >= 0) {
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String sub = body.substring(idx + 5);
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en = sub.substring(0, sub.indexOf("}")).toInt();
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}
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// Clamp values
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if (freq < 100) freq = 100;
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if (freq > 20000) freq = 20000;
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if (duty < 0) duty = 0;
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if (duty > 100) duty = 100;
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// Update PWM
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pwmFrequency = freq;
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pwmDuty = map(duty, 0, 100, 0, (1<<PWM_RESOLUTION)-1);
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pwmEnabled = (en == 1);
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if (pwmEnabled) {
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ledcSetup(PWM_CHANNEL, pwmFrequency, PWM_RESOLUTION);
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ledcAttachPin(PWM_GPIO, PWM_CHANNEL);
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ledcWrite(PWM_CHANNEL, pwmDuty);
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} else {
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ledcDetachPin(PWM_GPIO);
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}
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String json = "{";
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json += "\"ok\":true,\"freq\":" + String(pwmFrequency) + ",";
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json += "\"duty\":" + String(duty) + ",";
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json += "\"enabled\":" + String(pwmEnabled ? "true" : "false");
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json += "}";
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server.send(200, "application/json", json);
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}
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void setup() {
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Serial.begin(115200);
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// Set PWM GPIO as output (safe default)
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pinMode(PWM_GPIO, OUTPUT);
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digitalWrite(PWM_GPIO, LOW);
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// Start AP
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WiFi.mode(WIFI_AP);
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WiFi.softAP(AP_SSID, AP_PASSWORD);
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IPAddress apIP = WiFi.softAPIP();
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Serial.print("AP IP address: ");
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Serial.println(apIP);
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// Web server routes
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server.on("/", HTTP_GET, handleRoot);
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server.on("/get", HTTP_GET, handleGet);
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server.on("/set", HTTP_POST, handleSet);
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server.begin();
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Serial.println("HTTP server started");
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}
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void loop() {
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server.handleClient();
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// Nothing else needed; PWM runs in hardware
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}
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