Added T-ETH-ELite-Shield examples

examples/ADC_Button/ADC_Button.ino

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+/**
+ * @file      ADC_Button.ino
+ * @author    Lewis He ([email protected])
+ * @license   MIT
+ * @copyright Copyright (c) 2024  ShenZhen XinYuan Electronic Technology Co., Ltd
+ * @date      2024-06-24
+ * @note      The example demonstrates how to use ADC as a key function. Please see the example picture for the external circuit.
+ */
+#include <Arduino.h>
+
+// Select the board model to be used and adjust the Pin according to the actual situation
+
+// #define LILYGO_T_INTERNET_POE
+// #define LILYGO_T_ETH_POE_PRO
+// #define LILYGO_T_INTER_COM           //Can't run
+// #define LILYGO_T_ETH_LITE_ESP32
+// #define LILYGO_T_ETH_LITE_ESP32S3
+// #define LILYGO_T_ETH_ELITE_ESP32S3
+
+#if   defined(LILYGO_T_INTERNET_POE)
+// IO34 35,39,34,36 can only be used for input,ADC function is limited to GPIO33 and above
+#define ADC_PIN     36
+#elif defined(LILYGO_T_ETH_POE_PRO)
+// IO34 35,39,34,36 can only be used for input,ADC function is limited to GPIO33 and above
+#define ADC_PIN     36
+#elif defined(LILYGO_T_INTER_COM)
+//No free pin
+#error "No  free pin"
+#elif defined(LILYGO_T_ETH_LITE_ESP32)
+// IO35,36,37,38,39 can only be used for input and cannot be set as output
+#define ADC_PIN     36
+#elif defined(LILYGO_T_ETH_LITE_ESP32S3)
+// ESP32S3 can freely map unused Pins , ADC function is limited to GPIO33 and below
+#define ADC_PIN     7
+#elif defined(LILYGO_T_ETH_ELITE_ESP32S3)
+// ESP32S3 can freely map unused Pins , ADC function is limited to GPIO33 and below
+#define ADC_PIN     7
+#endif
+
+#define SAMPLE_TIME      200
+#define DEVIATION        0.1
+
+xQueueHandle adc_queue = NULL;
+
+void button_task(void *arg)
+{
+    while (1) {
+        double voltage = 0;
+        voltage = analogReadMilliVolts(ADC_PIN) / 1000.0;
+        xQueueSend(adc_queue, (double *)&voltage, 0);
+        vTaskDelay(pdMS_TO_TICKS(SAMPLE_TIME));
+    }
+    vTaskDelete(NULL);
+}
+
+void setup()
+{
+    Serial.begin(115200);
+    adc_queue = xQueueCreate(1, sizeof(double));
+    analogReadResolution(12);
+    analogSetAttenuation(ADC_11db);
+    xTaskCreatePinnedToCore(&button_task, "btn", 3 * 1024, NULL, 5, NULL, 0);
+}
+
+
+void loop()
+{
+    double voltage = 0;
+    xQueueReceive(adc_queue, &voltage, portMAX_DELAY);
+    if (voltage > 2.6) {
+    } else if (voltage > 2.2 - DEVIATION  && voltage <= 2.2 + DEVIATION) {
+        Serial.println("B5");
+    } else if (voltage > 1.65 - DEVIATION  && voltage <= 1.65 + DEVIATION) {
+        Serial.println("B4");
+    } else if (voltage > 1.11 - DEVIATION  && voltage <= 1.11 + DEVIATION) {
+        Serial.println("B3");
+    } else if (voltage > 0.76 - DEVIATION  && voltage <= 0.76 + DEVIATION) {
+        Serial.println("B2");
+    } else if (voltage > 0.43 - DEVIATION  && voltage <= 0.43 + DEVIATION) {
+        Serial.println("B1");
+    }
+    delay(5);
+}
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