From 473eff74c81b7ca48adb99e249cb7419dec0296f Mon Sep 17 00:00:00 2001
From: JP Stringham <jp@bloomdigital.to>
Date: Wed, 4 Feb 2026 11:39:14 -0500
Subject: [PATCH] Initial commit

---
 .gitignore  |   5 +
 Cargo.lock  | 284 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   7 ++
 src/err.rs  |   6 ++
 src/main.rs | 102 +++++++++++++++++++
 5 files changed, 404 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/err.rs
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8af2ebc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+/target
+
+/logs/*.csv
+
+.DS_Store
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..35abdfa
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,284 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
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+
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..56127c2
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "talkin_to_pico_w"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+chrono = "0.4.43"
diff --git a/src/err.rs b/src/err.rs
new file mode 100644
index 0000000..a612c3d
--- /dev/null
+++ b/src/err.rs
@@ -0,0 +1,6 @@
+pub enum RemotePicoError {
+    ConnectionRefused,
+    StreamWriteError,
+    StreamReadError,
+    CorruptReadError,
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..0f7ff0c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,102 @@
+mod err;
+
+use std::{
+    fs,
+    io::{Read, Write},
+    net::{SocketAddr, TcpStream},
+    time::{self, Duration, Instant},
+};
+
+use chrono::Utc;
+
+fn main() {
+    let cur = Utc::now().format("%s");
+    let mut log_file = fs::File::create(format!("logs/log_{}.csv", cur)).unwrap();
+    writeln!(log_file, "Unix TS, Temp, Read, Hi, Lo").unwrap();
+    let sleep_time = time::Duration::from_millis(100);
+
+    loop {
+        let last_check = Instant::now();
+        while last_check.elapsed().as_secs() < 5 {
+            std::thread::sleep(sleep_time);
+        }
+
+        write!(log_file, "{}, ", Utc::now().format("%s")).unwrap();
+        match get_pico_update() {
+            Ok(vals) => {
+                let vals_str: Vec<String> = vals.iter().map(|v| format!("{v}")).collect();
+
+                writeln!(log_file, "{}", vals_str.join(", ")).unwrap();
+            }
+            Err(_) => writeln!(log_file, "E, E, E, E").unwrap(),
+        }
+    }
+}
+
+fn get_pico_update() -> Result<[u16; 4], err::RemotePicoError> {
+    let socket_addr: SocketAddr = "192.168.1.201:1234".parse().unwrap();
+    let Ok(mut stream) = TcpStream::connect_timeout(&socket_addr, Duration::from_secs_f32(1.5))
+    else {
+        return Err(err::RemotePicoError::ConnectionRefused);
+    };
+
+    match stream.write("Hello Pico!".as_bytes()) {
+        Err(_) => return Err(err::RemotePicoError::StreamWriteError),
+        _ => (),
+    }
+
+    let mut buf = [0u8; 4096];
+    match stream.read(&mut buf) {
+        Err(_) => return Err(err::RemotePicoError::StreamReadError),
+        _ => (),
+    }
+    let buf = buf;
+
+    let mut vals = [0u16; 4];
+
+    for (i, v) in vals.iter_mut().enumerate() {
+        let mut u16_buf = [0u8; 2];
+        u16_buf.copy_from_slice(&buf[i * 2..i * 2 + 2]);
+        *v = u16::from_le_bytes(u16_buf);
+    }
+
+    match buf[vals.len() * 2] {
+        b'E' => (),
+        _ => return Err(err::RemotePicoError::CorruptReadError),
+    }
+
+    println!("Values: {vals:?}");
+    let t = vals[0];
+    println!("Int Temp: {}°C", convert_to_celsius(t));
+    let mx = vals[2];
+    println!("3V Ref: {}", mx);
+    let mn = vals[3];
+    println!("GND Ref: {}", mn);
+
+    let mv = convert_to_mv(vals[1], mn, mx);
+    println!("Read {mv}mV");
+
+    let v_divider_inv = convert_voltage_div(mv);
+    println!("{}mV", v_divider_inv);
+
+    return Ok(vals);
+}
+
+fn convert_voltage_div(mv: u32) -> f32 {
+    let r1 = 22300.;
+    let r2 = 3300.;
+
+    mv as f32 / (r2 / (r1 + r2))
+}
+
+fn convert_to_mv(raw_adc_val: u16, adc_min: u16, adc_max: u16) -> u32 {
+    (raw_adc_val.saturating_sub(adc_min)) as u32 * 3000 / adc_max as u32
+}
+
+fn convert_to_celsius(raw_temp: u16) -> f32 {
+    // According to chapter 4.9.5. Temperature Sensor in RP2040 datasheet
+    let temp = 27.0 - (raw_temp as f32 * 3. / 4096.0 - 0.706) / 0.001721;
+    let sign = if temp < 0.0 { -1.0 } else { 1.0 };
+    let rounded_temp_x10: i16 = ((temp * 10.0) + 0.5 * sign) as i16;
+    (rounded_temp_x10 as f32) / 10.0
+}