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Engine Temp Monitor using ESP32 and DS18B20

Protect your engine with proactive temperature monitoring you can trust. In this video, we build a rugged ESP32 + DS18B20 (one-wire) solution that’s waterproof and rated to 125 °C, then stream it into Home Assistant for live gauges, history, and alerts. Perfect for catching issues (intake blockages, worn impellers, low raw-water flow) before they get critical—and for keeping an eye on alternator temps when running lithium batteries. What you’ll learn ✅ Sensor placement that matters: coolant, thermostat, raw-water elbow, alternator (4 points for early warnings). ✅ ESPHome + Home Assistant: add sensors, validate YAML, capture unique addresses from logs, sample every 10 s, and push OTA. ✅ Dashboards: create a dedicated Engine view with needle gauges, color bands (e.g., yellow 30 °C, red 42 °C on raw-water elbow), and history analytics. ✅ Automations: trigger siren/notifications (e.g., alternator more than 100 °C) and lay the groundwork for smarter actions later. ✅ Practical hardware setup: ESP32 with breakout board, Dallas/One-Wire bus, a single 4.7 kΩ pull-up, and clean wiring inside a junction box. Quick wiring & setup tips 🔧 One-Wire bus: 3.3 V (red) data (yellow) GND (black). Use one 4.7 kΩ resistor between 3.3 V and DATA for the entire bus. 🔧 Multiple sensors: all reds share 3.3 V, all yellows share the same data pin (GPIO25 as shown), all blacks share GND. 🔧 Logs are your friend: grab each sensor’s address from ESPHome logs, paste into YAML, validate, and OTA. Use cases 🛡️ Early-warning safety for cooling water flow and impeller health. ⚡ Alternator temperature oversight for lithium installs. 📈 Trend insight: compare last-week temperatures to know your boat’s “normal.” Parts used ✔ ESP32 S3 Latest and Fasted Model 🎁 Amazon: https://geni.us/ESP32-S3 https://geni.us/ESP32-S3-B 🎁 AliExpress: Select N16R8 KIT https://s.click.aliexpress.com/e/_DC2... ✔ ESP32 - 38 pins 🎁 Amazon: Select 38pin model https://geni.us/esp32-38pin 🎁 AliExpress: https://s.click.aliexpress.com/e/_Dd4... ✔ ESP32 38 pins Breakout Board 🎁 Amazon: https://geni.us/esp32-38pin-breakout 🎁 AliExpress: https://s.click.aliexpress.com/e/_DdP... ✔ ESP32 - 30 pins 🎁 Amazon: Select 30pin model https://geni.us/esp32-30pins https://geni.us/esp32-30pin-kit 🎁 AliExpress: Mirco USB or USB C models https://s.click.aliexpress.com/e/_DdF... ✔ ESP32 30 pins Expansion Breakout Board 🎁 Amazon: https://geni.us/esp32-30pin-breakout 🎁 AliExpress: https://s.click.aliexpress.com/e/_DFM... ✔ 12v to 5v Converter 🎁 Amazon: https://geni.us/12v-5v-converter 🎁 AliExpress: Select the 12V to 5V 3A option https://s.click.aliexpress.com/e/_Deu... ✔ INA219 Module: 🎁 Amazon: https://geni.us/yE8oa 🎁 AliExpress: Select soldered option or ask them https://s.click.aliexpress.com/e/_Dd2... ✔ Dupont breakout cables: 🎁 Amazon: https://geni.us/Dupont-cables 🎁 AliExpress: https://s.click.aliexpress.com/e/_DdQ... ✔ Temperature Sensors Dallas One Wire: 🎁 Amazon: 1M Length https://geni.us/vANa 3M Length https://geni.us/7KqXm1w 🎁 AliExpress: Select length and pieces option https://s.click.aliexpress.com/e/_DBy... ✔ Resistors for Temp Sensor ( 4.7K OHM ): 🎁 Amazon: Kit of various sizes https://geni.us/DWBKQ 🎁 AliExpress: Kit of various sizes https://s.click.aliexpress.com/e/_Deu... ✔ Junction Box (80mm x 80mm): 🎁 Amazon: https://geni.us/n9oc7 https://geni.us/a3xe 🎁 AliExpress: Select 83x81x56mm https://s.click.aliexpress.com/e/_DBO... If you'd like to support me so that I can buy extra sensors and equipment for future projects: 💖 Buy Me a Coffee: https://ko-fi.com/smartboatinnovations Some links above are affiliate links, meaning I may earn a small commission if you make a purchase. Your support helps fund valuable content. Thank you! Chapters 0:00 Introduction 1:53 Dolphin 2:01 ESP32 and DS18B20 Overview 5:31 Engine sensor locations 5:56 Adding to Home assistant 10:42 Add gauge to Dashboard 12:07 4 Gauges and analytics 13:23 Add Automation 14:15 My Boat 14:27 Outro Keywords (SEO) ESP32, DS18B20, Dallas one-wire, GPIO25, 4.7k resistor, engine temperature monitoring, marine engine sensors, boat safety, Home Assistant, ESPHome, alternator temperature, raw water elbow, thermostat sensor, coolant temperature, marine electronics DIY, lithium batteries alternator heat, waterproof temperature sensor, OTA update, YAML config, engine dashboard, temperature alerts, boating technology Disclaimer The information provided in this video is for educational and informational purposes only. SmartBoat Innovations assumes no responsibility for any damage, fire, injury, or loss resulting from the use or misuse of the information provided. Viewers are responsible for ensuring that all installations and modifications are performed safely and correctly. It is recommended to consult with a licensed professional before attempting any work on your boat's electrical systems. Use this information at your own risk