diff --git a/src/main.rs b/src/main.rs
index e41ab92..0bedda3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,16 +2,17 @@
 #![no_main]
 
 mod crypto;
+mod datetime;
 
-use arduino_hal::hal::usart::BaudrateArduinoExt;
-use arduino_hal::prelude::*;
-use arduino_hal::{delay_ms, Usart};
+use arduino_hal::default_serial;
+use arduino_hal::delay_ms;
 use crypto::hmac_sha1;
+use ds323x::Rtcc;
 
 use panic_halt as _;
 
 const INTERVAL: u64 = 30;
-const SECRET_KEY_MAX_LEN: u8 = 32;
+const SECRET_KEY_MAX_LEN: usize = 32;
 
 fn process_secret<'a>(secret: &str, output: &mut [u8]) -> usize {
     // RFC 6238 Doesn't specify a max length for the secret keys, So I chose 32
@@ -40,7 +41,7 @@ fn process_secret<'a>(secret: &str, output: &mut [u8]) -> usize {
 }
 
 fn generate_otp_token(private_key: &str, actual_time: u64) -> u32 {
-    let mut output = [0u8; 50];
+    let mut output = [0u8; 32];
     let private_key_len = process_secret(private_key, &mut output);
 
     let interval = actual_time / INTERVAL;
@@ -56,38 +57,54 @@ fn generate_otp_token(private_key: &str, actual_time: u64) -> u32 {
     ((raw_token & 0x7F_FF_FF_FF) % 1_000_000) as u32
 }
 
-fn token_to_bytes(mut token: u32, output: &mut [u8]) {
-    let mut inc = 0;
-    while token > 0 {
-        output[inc] = (token % 10) as u8 + b'0';
-        token /= 10;
-        inc += 1;
-    }
-    output.reverse()
-}
-
 #[arduino_hal::entry]
 fn main() -> ! {
     let dp = arduino_hal::Peripherals::take().unwrap();
     let pins = arduino_hal::pins!(dp);
 
     let mut led = pins.d13.into_output();
-    let mut serial = Usart::new(
-        dp.USART0,
-        pins.d0,
-        pins.d1.into_output(),
-        BaudrateArduinoExt::into_baudrate(9600),
+    let mut serial = default_serial!(dp, pins, 9600);
+
+    let i2c_clock = arduino_hal::I2c::new(
+        dp.TWI,
+        pins.a4.into_pull_up_input(),
+        pins.a5.into_pull_up_input(),
+        50000,
     );
+    let mut rtc = ds323x::Ds323x::new_ds3231(i2c_clock);
+
+    let year = rtc.year().unwrap();
+    let month = rtc.month().unwrap();
+    let day = rtc.day().unwrap();
+    let hour = match rtc.hours().unwrap() {
+        ds323x::Hours::AM(val) => val,
+        ds323x::Hours::PM(val) => val + 12,
+        ds323x::Hours::H24(val) => val,
+    };
+    let minute = rtc.minutes().unwrap();
+    let second = rtc.seconds().unwrap();
+
+    let datetime = datetime::Datetime {
+        year: year,
+        month: month,
+        day: day,
+        hours: hour,
+        minutes: minute,
+        seconds: second,
+    };
+    let timestamp = datetime.unix_epoch();
+    ufmt::uwriteln!(&mut serial, "Timestamp: {}", timestamp);
 
-    // let token = generate_otp_token("holaaaaamundo", 1680155315);
     let token = generate_otp_token("FS7J22EHLLSOGKUVJKV2XE7FTIX24JAJ", 1680155315);
-    let mut output = [0u8; 6];
-    token_to_bytes(token, &mut output);
+    ufmt::uwriteln!(&mut serial, "token: {}", token).unwrap();
 
-    for b in output {
-        serial.write_byte(b);
-    }
-    serial.write_byte('\n' as u8);
+    delay_ms(5000);
+    let token = generate_otp_token("FS7J22EHLLSOGKUVJKV2XE7FTIX24JAJ", 1680155315);
+    ufmt::uwriteln!(&mut serial, "token: {}", token).unwrap();
+
+    delay_ms(5000);
+    let token = generate_otp_token("FS7J22EHLLSOGKUVJKV2XE7FTIX24JAJ", 1680155315);
+    ufmt::uwriteln!(&mut serial, "token: {}", token).unwrap();
 
     loop {
         led.toggle();