PLMEX2_RPM_4.0.a.ino: For Module 01M30V0. Display on a 1602 LCD.

May 15, 2025
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PLMEX2_RPM_4.0.a.ino: For Module 01M30V0. Display on a 1602 LCD.

Target:

The purpose of this software is to display the following data on a 1602 LCD with an I2C controller:
  • 1 x RPM
  • 2 x Oxygen percentage, Lambda Or AFR.(Shows the status when there is no measurement.)

A larger display such as an LCD 2004 can also show the measurements (1 x battery voltage and 3 x analogue input voltage (0-5V)). See software PLMEX2_RPM_4.1.ino.

An adjustment to the oxygen measurement can be made to improve measurement accuracy using the pin D8.

Pins with a function that work as push buttons:

  •   "D8" Adjust lambda 1 and lambda 2.

Hardware required to use this software:

  • Arduino board, MEGA, UNO R3, UNO R4, or UNO R4 Wifi or others.  
  • 1x Lambda module "Controlduino 01M30V00" and wires.
  • 2xWideband lambda probe.
  • LCD Display HD44780 1602 with I2C interface.
  • Power supply (V=12v, I>=6A), It is advisable to use a car battery.

 

Compatible with arduino boards

  • Compatibilities with 5V arduino boards.
    • Arduino UNO R3.(Bus SPI)
    • Arduino UNO R4 mínima.(Bus SPI)
    • Arduino UNO R4 WIFI.(Bus SPI)
    • Arduino MEGA.(Bus SPI)
    • Others, compatible but not tested.
  • Compatible with 3.3 V Arduino boards via 3.3-5 V SPI adapter.
    • Arduino Nano. (Bus SPI, with SPI adapter.)
    • Others, compatible but not tested.

 

Others.

  • The software uses the library ‘LambdaX2_rpm.h’.
  • Note: Pin D2 is the slave selector for the SPI bus.
  • Note: pin D8 functions as an adjustment button for the two lambda probes, which will be carried out by measuring clean air. The pin has a pull-up resistor at 5 V and acts on the rising edge, so after grounding the pin, it must be left at high impedance.El ajuste no se completará si la sonda lambda no está conectada o el estado de la sonda no es medición.