Demo here: https://www.youtube.com/watch?v=1vhxyDxPzY0

🔥 PIC16F628 Digital Thermometer Firmware + Full Build Package (DS18B20, Assembly Language)

Build a reliable, accurate, and ultra-fast digital thermometer using the classic PIC16F628 microcontroller and the DS18B20 1-Wire temperature sensor. This package includes fully tested assembly code, schematics, BOM, and everything you need to drop straight into your own project.

This is not generic code from the internet — it’s a fully optimised, timing-accurate firmware designed specifically for 4 MHz clock, correct 1-Wire timings, and stable operation even on long sensor cables.

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✅ What’s Included

You will receive a complete project pack containing:

📌 Firmware • Fully commented PIC16F628 Assembly (ASM) source code • Pre-compiled working HEX file (ready to flash) • Celsius readings • Accurate 1-Wire timing routines

📌 Hardware • Full schematic • Bill of Materials (easy-to-source components) • Wiring diagram / pinout reference • Optional: PCB layout preview (if you want, I can generate Gerbers too) • All found here for free: https://tinyurl.com/Digital-thermistor

📌 Documentation • Step-by-step build instructions • How to correctly wire and test the DS18B20 • All found for free here also: https://tinyurl.com/Digital-thermistor ⸻

⭐ Why This Firmware Is Special

Most DS18B20 examples are written for Arduino or high-level languages. This project is:

⚡ Ultra-Optimised for PIC Assembly (mpasm mplab 8.92 or earlier, not the bloated mplab x) • Accurate 1-Wire read/write slots • Cycle-perfect delays at 4 MHz • Robust reset pulse detection • Works reliably on noisy lines • Clean, readable register-level code

🧰 Perfect for hobbyists, students, and product builders

If you want to learn or build something real-world, this gives you: • A working thermometer • Clean assembly code • Working hardware • You can modify it for your own product

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🎯 Who This Project Is For • PIC developers • Electronics students • Makers building temperature monitors • Anyone learning PIC assembly • Product designers needing a temperature module

If you just want something that “works”, you can flash the HEX file and go. If you want to learn, the commented ASM code is easy to follow.

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💬 Support

If you get stuck, message me — I’m happy to help you wire it or troubleshoot your build.

What's included in this Digital Download? Assembly code file ready to edit and or compile and flash to your PIC16F628. The schematics and tutorial on the build are free and found here: https://tinyurl.com/Digital-thermistor

Why Use PIC Assembly Instead of Arduino/ESP32?

Most examples online use high-level microcontrollers. This project is different — it’s built for speed, reliability and precision.

✔ No operating system ✔ No Arduino bloat ✔ Cycle-perfect timing ✔ Ultra-low power ✔ Microsecond-level accuracy ✔ Starts instantly ✔ Production-grade reliability

Disclaimer — For non commercial personal use only

This thermometer project (including source code, schematic, and documentation) is supplied strictly for personal learning, research, or hobby use. It is not certified or intended for commercial, industrial, or medical applications. For a commercial license, please message me.

The design and code are provided as-is, without any warranty of any kind — express or implied — including but not limited to fitness for a particular purpose, merchantability, or safety.

By downloading, building, or using this project, you agree that you are solely responsible for verifying all safety aspects, electrical ratings, and compliance with local regulations. The author accepts no liability for any loss, damage, injury, or death arising from use or misuse of this project.

Do not use this design in situations where failure could cause harm or financial loss. Use at your own risk.

If you’re also interested in modifying this project to suit your needs, why not hire me by messaging me? I built the code so understand the ins and outs of how it works. It is an extremely small single code file that is written in assembly language, so not a single line is unnecessary or causing too many instructions like if it was written in C. This will in turn promote battery life while it’s running. If you’d like the assembly file get in touch. If you’d like to incorporate this into your product project, get in touch.

Copywrite Notice: This assembly code file download is Copywrited by ODONODESIGN for one use only by the purchaser on this page. Under no circumstances may this code be resold/redistributed as is or modified/edited. You are free to use this for personal educational use only. Failure to comply with this will result in legal action being taken.

Happy Downloading!