digital afr

[andybp]

I was going to get fancy with this and get it to do all sorts of clever things but at the end of the day all I actually wanted was an AFR meter that looked pretty OEM and

since installing my link ecu my trip computer no longer works which I knew was going to happen so no big deal actually ideal for my AFR gauge

I pulled it apart to measure up to see what display I could use it comes apart easy 2 screws an 6 clips

 

 

the display I decided to use was this 1.3" oled i2c display cost about £4 from china

 

 

combined with an arduino nano controller which has an onboard voltage regulator so will runn directly off 12 Volts

 

 

this is it running the I2c interface on the display means it only needs four wires to connect to it

the program was really simple 

 

#include <Arduino.h>
#include <U8g2lib.h>
#include <Wire.h>

U8G2_SH1106_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

void setup(void) {

  u8g2.begin();  
}
int val = 0; 
int afr = 0; 
uint8_t m = 100;

void loop(void) {
  char m_str[4];
  strcpy(m_str, u8x8_u8toa(m, 3));
  u8g2.firstPage();
  do {
    u8g2.setFont(u8g2_font_logisoso62_tn);
    u8g2.drawStr(67,35,".");
    u8g2.drawStr(0,63,m_str);
  } while ( u8g2.nextPage() );
  delay(10);
  val = analogRead(0);
  afr =val/10.23;
  m = afr+100; 
}

 

 

all I need to do now is get the soldering iron out connect it to a switched 12v supply and the 0-5v signal from my wideband controller and I can put my gauges back in.

I'll update this post with the final pictures obviously

[Keyser]

I'm happy the programme was simple for you, must just be me that looked at that and though - "his keyboard has had a funny 5" 

 

As always a great solution looks to be on the horizon

[andybp]

10 hours ago, Keyser said:

I'm happy the programme was simple for you, must just be me that looked at that and though - "his keyboard has had a funny 5" 

 

As always a great solution looks to be on the horizon

I wasn't going to put the program in but I thought someone might like to give it a try who hasn't any programming experiance cost me about £6 in parts so if you have an aftermarket ecu chances are the trip computer will no longer work and it will look pretty OEM

 

 

[andybp]

here it is fitted just need to connect it to the afr signal sadly hurricane brian stopped play