Wideband O2 + MAP Piggyback
The sensor ESP32 becomes a fuel tuning piggyback ECU. Reads real MAP voltage, reads wideband O2 via I²C ADS1115, computes fuel correction, outputs modified MAP voltage via I²C MCP4725 DAC.
Hardware add-ons
- ADS1115 16-bit I²C ADC for wideband O2 (0-5V → I²C)
- MCP4725 12-bit I²C DAC for corrected MAP output (I²C → 0-5V)
- 14point7 Spartan 2 or similar wideband controller
New UDP fields
wboAFR, wboLambda, targetAFR, fuelCorrection
Commands
{"cmd":"set_target_afr","value":14.7}
{"cmd":"set_piggyback","value":1}
See wideband_piggyback_plan.md in the how_to_md_files for full wiring and firmware plan.
Status: 🟡 Planned — code stubs exist in carputer (Linux) and carputerandroid apps.
Wideband O2 + MAP Piggyback
The sensor ESP32 becomes a fuel tuning piggyback ECU. Reads real MAP voltage, reads wideband O2 via I²C ADS1115, computes fuel correction, outputs modified MAP voltage via I²C MCP4725 DAC.
Hardware add-ons
New UDP fields
wboAFR,wboLambda,targetAFR,fuelCorrectionCommands
{"cmd":"set_target_afr","value":14.7}{"cmd":"set_piggyback","value":1}See
wideband_piggyback_plan.mdin the how_to_md_files for full wiring and firmware plan.Status: 🟡 Planned — code stubs exist in carputer (Linux) and carputerandroid apps.