diff --git a/Cargo.lock b/Cargo.lock
index f2edc9e..3a5dc40 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -12,7 +12,7 @@ dependencies = [
  "avr-hal-generic",
  "cfg-if 1.0.0",
  "embedded-hal",
- "ufmt",
+ "ufmt 0.1.2",
  "void",
 ]
 
@@ -25,6 +25,12 @@ dependencies = [
  "avr-hal-generic",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
 [[package]]
 name = "avr-device"
 version = "0.5.0"
@@ -60,7 +66,7 @@ dependencies = [
  "nb 0.1.3",
  "paste",
  "rustversion",
- "ufmt",
+ "ufmt 0.1.2",
  "void",
 ]
 
@@ -88,6 +94,26 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "chrono"
+version = "0.4.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e3c5919066adf22df73762e50cffcde3a758f2a848b113b586d1f86728b673b"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "ds323x"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "057e63d03a3beb83d3c9b7a19b799c60e203b0c53f1bbec6a715804907f73a2b"
+dependencies = [
+ "embedded-hal",
+ "rtcc",
+]
+
 [[package]]
 name = "embedded-hal"
 version = "0.2.7"
@@ -119,6 +145,25 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d5439c4ad607c3c23abf66de8c8bf57ba8adcd1f129e699851a6e43935d339d"
 
+[[package]]
+name = "num-integer"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "panic-halt"
 version = "0.2.0"
@@ -155,6 +200,15 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rtcc"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3623619ce77c09a7d87cf7c61c5c887b9c7dee8805f66af6c4aa5824be4d9930"
+dependencies = [
+ "chrono",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.12"
@@ -167,8 +221,11 @@ version = "0.1.0"
 dependencies = [
  "arduino-hal",
  "binascii",
+ "chrono",
+ "ds323x",
  "panic-halt",
  "sha1_smol",
+ "ufmt 0.2.0",
 ]
 
 [[package]]
@@ -195,7 +252,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "31d3c0c63312dfc9d8e5c71114d617018a19f6058674003c0da29ee8d8036cdd"
 dependencies = [
  "proc-macro-hack",
- "ufmt-macros",
+ "ufmt-macros 0.2.0",
+ "ufmt-write",
+]
+
+[[package]]
+name = "ufmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a64846ec02b57e9108d6469d98d1648782ad6bb150a95a9baac26900bbeab9d"
+dependencies = [
+ "ufmt-macros 0.3.0",
  "ufmt-write",
 ]
 
@@ -211,6 +278,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "ufmt-macros"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d337d3be617449165cb4633c8dece429afd83f84051024079f97ad32a9663716"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "ufmt-write"
 version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index 5c1744c..d657aeb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,10 +8,13 @@ arduino-hal = {  git = "https://github.com/rahix/avr-hal", features = ["arduino-
 panic-halt = "0.2.0"
 sha1_smol = "1.0.0"
 binascii = { version = "0.1", default-features = false, features = ["decode"] }
+chrono = { version = "0.4.24", default-features = false }
+ds323x = "0.5.0"
+ufmt = "0.2.0"
 
 [profile.release]
 lto = true
 panic = "abort"
 strip = true
 opt-level = "z"
-codegen-units = 1
\ No newline at end of file
+codegen-units = 1
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6b3b935
--- /dev/null
+++ b/README.md
@@ -0,0 +1,5 @@
+# RustyToken
+
+## Converts any Arduino into a TOTP keys
+
+You can build a TOTP Key with an Arduino
diff --git a/build.sh b/build.sh
index 03eca32..5347662 100755
--- a/build.sh
+++ b/build.sh
@@ -1 +1 @@
-cargo build -Z build-std=core --target avr-atmega328p.json --release
+cargo build -Z build-std-features=panic_immediate_abort -Z build-std=core --target avr-atmega328p.json --release
diff --git a/src/main.rs b/src/main.rs
index e41ab92..3c119d0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,15 +3,15 @@
 
 mod crypto;
 
-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::DateTimeAccess;
 
 use panic_halt as _;
 
-const INTERVAL: u64 = 30;
-const SECRET_KEY_MAX_LEN: u8 = 32;
+const INTERVAL: i64 = 30;
+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
@@ -39,7 +39,7 @@ fn process_secret<'a>(secret: &str, output: &mut [u8]) -> usize {
     decoded.len()
 }
 
-fn generate_otp_token(private_key: &str, actual_time: u64) -> u32 {
+fn generate_otp_token(private_key: &str, actual_time: i64) -> u32 {
     let mut output = [0u8; 50];
     let private_key_len = process_secret(private_key, &mut output);
 
@@ -72,22 +72,24 @@ fn main() -> ! {
     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 = 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);
 
-    // 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);
+    let timestamp = rtc.datetime().unwrap().timestamp();
+    let timestamp = 0;
 
-    for b in output {
-        serial.write_byte(b);
-    }
-    serial.write_byte('\n' as u8);
+    ufmt::uwriteln!(&mut serial, "timestamp: {}", timestamp).unwrap();
+
+    // let token = generate_otp_token("holaaaaamundo", timestamp.try_into().unwrap());
+    let token = generate_otp_token("aaaaaaaa", timestamp);
+
+    ufmt::uwriteln!(&mut serial, "token: {}", token).unwrap();
 
     loop {
         led.toggle();