diff --git a/TTGO-T-Display.ino b/TTGO-T-Display.ino
new file mode 100644
index 0000000..6197f07
--- /dev/null
+++ b/TTGO-T-Display.ino
@@ -0,0 +1,156 @@
+#include <TFT_eSPI.h>
+#include <SPI.h>
+#include "WiFi.h"
+#include <Wire.h>
+#include <Button2.h>
+#include "esp_adc_cal.h"
+#include <Ticker.h>
+
+#define TFT_MOSI            19
+#define TFT_SCLK            18
+#define TFT_CS              5
+#define TFT_DC              16
+#define TFT_RST             23
+
+#define TFT_BL       14  // Dispaly backlight control pin
+#define ADC_PIN      34
+#define BUTTON_1     35
+#define BUTTON_2     0
+#define BUTTONS_MAP {BUTTON_1,BUTTON_2}
+
+TFT_eSPI tft = TFT_eSPI(135, 240); // Invoke custom library
+
+Button2 *pBtns = nullptr;
+uint8_t g_btns[] =  BUTTONS_MAP;
+char buff[512];
+int vref = 1100;
+int btnCick = false;
+Ticker tick;
+
+void showVoltage()
+{
+    static uint64_t timeStamp = 0;
+    if (millis() - timeStamp > 1000) {
+        timeStamp = millis();
+        uint16_t v = analogRead(ADC_PIN);
+        float battery_voltage = ((float)v / 4095.0) * 2.0 * 3.3 * (vref / 1000.0);
+        String voltage = "Voltage :" + String(battery_voltage) + "V";
+        tft.fillScreen(TFT_BLACK);
+        tft.setTextDatum(MC_DATUM);
+        tft.drawString(voltage,  tft.width() / 2, tft.height() / 2 );
+    }
+}
+
+void button_init()
+{
+    uint8_t args = sizeof(g_btns) / sizeof(g_btns[0]);
+    pBtns = new Button2 [args];
+    pBtns[0] = Button2(g_btns[0]);
+    pBtns[1] = Button2(g_btns[1]);
+    pBtns[0].setLongClickHandler([](Button2 & b) {
+        btnCick = false;
+        int r = digitalRead(TFT_BL);
+        tft.fillScreen(TFT_BLACK);
+        tft.setTextColor(TFT_GREEN, TFT_BLACK);
+        tft.setTextDatum(MC_DATUM);
+        tft.drawString("Press again to wake up",  tft.width() / 2, tft.height() / 2 );
+        delay(6000);
+        digitalWrite(TFT_BL, !r);
+        esp_sleep_enable_ext1_wakeup(GPIO_SEL_35, ESP_EXT1_WAKEUP_ALL_LOW);
+        esp_deep_sleep_start();
+    });
+    pBtns[0].setPressedHandler([](Button2 & b) {
+        Serial.println("Detect Voltage..");
+        btnCick = true;
+    });
+
+    pBtns[1].setPressedHandler([](Button2 & b) {
+        btnCick = false;
+        Serial.println("btn press wifi scan");
+        wifi_scan();
+    });
+}
+
+void button_loop()
+{
+    for (int i = 0; i < sizeof(g_btns) / sizeof(g_btns[0]); ++i) {
+        pBtns[i].loop();
+    }
+}
+
+void wifi_scan()
+{
+    tft.setTextColor(TFT_GREEN, TFT_BLACK);
+    tft.fillScreen(TFT_BLACK);
+    tft.setTextDatum(MC_DATUM);
+    tft.setTextSize(1);
+
+    tft.drawString("Scan Network", tft.width() / 2, tft.height() / 2);
+
+    WiFi.mode(WIFI_STA);
+    WiFi.disconnect();
+    delay(100);
+
+    int16_t n = WiFi.scanNetworks();
+    tft.fillScreen(TFT_BLACK);
+    if (n == 0) {
+        tft.drawString("no networks found", tft.width() / 2, tft.height() / 2);
+    } else {
+        tft.setTextDatum(TL_DATUM);
+        tft.setCursor(0, 0);
+        Serial.printf("Fount %d net\n", n);
+        for (int i = 0; i < n; ++i) {
+            sprintf(buff,
+                    "[%d]:%s(%d)",
+                    i + 1,
+                    WiFi.SSID(i).c_str(),
+                    WiFi.RSSI(i));
+            tft.println(buff);
+        }
+    }
+}
+
+void setup()
+{
+    Serial.begin(115200);
+    delay(1000);
+
+    tft.init();
+    tft.setRotation(0);
+    tft.fillScreen(TFT_BLACK);
+    tft.setTextSize(2);
+    tft.setTextColor(TFT_WHITE);
+    tft.setCursor(0, 0);
+    tft.setTextDatum(MC_DATUM);
+    tft.drawString("TTGO",  tft.width() / 2, tft.height() / 2 );
+    tft.setTextSize(1);
+
+    if (TFT_BL > 0) {
+        pinMode(TFT_BL, OUTPUT);
+        digitalWrite(TFT_BL, HIGH);
+    }
+
+    button_init();
+
+    esp_adc_cal_characteristics_t adc_chars;
+    esp_adc_cal_value_t val_type = esp_adc_cal_characterize((adc_unit_t)ADC_UNIT_1, (adc_atten_t)ADC1_CHANNEL_6, (adc_bits_width_t)ADC_WIDTH_BIT_12, 1100, &adc_chars);
+    //Check type of calibration value used to characterize ADC
+    if (val_type == ESP_ADC_CAL_VAL_EFUSE_VREF) {
+        Serial.printf("eFuse Vref:%u mV", adc_chars.vref);
+        vref = adc_chars.vref;
+    } else if (val_type == ESP_ADC_CAL_VAL_EFUSE_TP) {
+        Serial.printf("Two Point --> coeff_a:%umV coeff_b:%umV\n", adc_chars.coeff_a, adc_chars.coeff_b);
+    } else {
+        Serial.println("Default Vref: 1100mV");
+    }
+}
+
+
+
+void loop()
+{
+    if (btnCick) {
+        showVoltage();
+    }
+    button_loop();
+}
\ No newline at end of file