Pit Row Controller OS

The Open-Source Data Acquisition System for Rotating Machinery

Universal. Configurable. Standalone.

The Pit Row Controller is a standalone engine management and dyno data acquisition system designed to run on the ESP32 platform. Originally developed for small engine dynamometers, this system is chassis-agnostic.

Whether you are building a custom DIY brake dyno or retrofitting modern data acquisition onto an existing chassis, this controller handles the math so you can focus on the tuning.

Features

• Universal Input: Configurable for any gear ratio, magnet count, or load cell calibration.
• Auto-Scaling Graphs: Software dynamically adjusts to any torque or RPM range.
  • Software Dynamic Range: Unlimited.
• Dual-Mode Operation:
  • Freestyle: Live, responsive gauges for tuning, break-in, and instant feedback.
  • Dyno Run: Automated logging, power curve generation, and peak value capture.
• Touch Interface: Optimized for 7" Sunton ESP32 screens with LVGL graphics.
• Desktop Companion: Connects to the Pit Row Desktop App for detailed analysis and report generation.

Hardware Support

The OS is designed to run on the Sunton ESP32-8048S070 (7-inch Touchscreen) and supports the following standard sensors:

• Core: ESP32-S3 (Sunton Board)
• Torque: HX711 Load Cell Amplifiers (with Auto-Tare on boot)
• RPM: Hall Effect Sensors (NJK-5002A or similar)
• Temp (EGT): MCP9600 Thermocouple Amplifiers (K-Type)
• AFR: 0-5V Analog Wideband Controllers (Compatible with AEM, Innovate, etc.)

Getting Started

1. Flash the Firmware

The core firmware is located in the /firmware directory. You can flash this directly to your Sunton board using PlatformIO.

2. Wire Your Rig

We provide reference wiring diagrams in the /wiring folder.

• Base Model: The standard setup for basic Load/Brake dynos (RPM + Torque).
• Expanded Model: Adds EGT and AFR logging capabilities for full engine tuning.

3. Configure Your Physics

Once booted, use the on-screen Settings Menu to input your specific mechanical ratios:

• Final Drive Ratio (Engine to Absorber)
• Magnet Count (Pulse per Revolution)
• Calibration Weight (For Load Cell setup)

Mechanical Builds

Looking for the Pit Row Dyno frame plans? The mechanical designs, laser-cut DXF files, and welding guides for our reference chassis are located in the Pit Row Mechanical Repo.

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License

This project is Open Source. See the LICENSE file for details.