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I've pretty much decided that the 4L80e is the path I'm going to take with my CUCV. But the $600+ for a controller stings. I've been tinkering with a arduino to control it. Right now this is only a proof of concept. The LEDs would actually be IRF540's to control the solenoids. There actually needs to be a 4th as well for the line control, but I'll just live with firm shifts for now. What I have envisioned is to add a LCD screen (simple monochrome one) to display the transmission gear, mode, RPM, trans temp, maybe MPH. What will be needed for automatic shifting would be a TPS, engine RPM, and VSS. I know a 6.5TD TPS should be useable. The RPM could be had by swapping out the "distributor" with a 6.5TD as well. The VSS would probably need to be a inline adapter from dakota digital. Or if you're swapping in a later model t-case, you'd have a VSS. (But you'd need to deal with the speedo for a CUCV with either a GPS unit, a digital to cable adapter, or a speedo that uses a signal instead) I'd like to add a tow/haul button where 3rd gear also locks TCC after delay. As well as button to cycle through modes. (Auto/Manual) I'm wanting this to all be open source, so anyone else wanting to help on this, please feel free to help/share.
https://www.youtube.com/watch?v=FWxGnakPIFo
Here's the initial code:
https://www.youtube.com/watch?v=FWxGnakPIFo
Here's the initial code:
Code:
#define NUM_FWD_GEARS 4 //# number of forward speeds
#define BUTTON_READ_INTERVAL 50ul //mS time between up/down button reads
#define NO_PRESS 0x00 //mask bit mask for no buttons pressed
#define BUTTON_UP_PRESSED 0x01 //mask bit mask for up button pressed
#define BUTTON_DOWN_PRESSED 0x02 //mask bit mask for down button pressed
#define TCC_DELAY 1000ul //mS after TCC is enabled, time delay before activation
const byte buttonUP = 2; //pin Push Button for UP shift
const byte buttonDOWN = 4; //pin Push Button for Down shift
const byte solA = 3; //pin Solenoid A output
const byte solB = 5; //pin Solenoid B output
const byte TCC = 6; //pin TCC output
const byte modeswitch = 7; //pin Switch for tow/haul mode
byte
gearSelection,
lastGearSelection,
lastUp,
lastDn;
bool
bTCCStatus;
unsigned long
timeTCCSolenoid;
typedef struct structGearSolenoidProfiles
**
byte solenoid_A;
byte solenoid_B;
bool bEnableTCC;
}sGearSolenoidProfiles;
//
// How does Arduino know reverse, park or drive?
//
const sGearSolenoidProfiles GearSolenoidProfiles[NUM_FWD_GEARS] =
**
**
//1st
.solenoid_A = HIGH,
.solenoid_B = LOW,
.bEnableTCC = false
},
**
//2nd
.solenoid_A = LOW,
.solenoid_B = LOW,
.bEnableTCC = false
},
**
//3rd
.solenoid_A = LOW,
.solenoid_B = HIGH,
.bEnableTCC = false
},
**
//4th
.solenoid_A = HIGH,
.solenoid_B = HIGH,
.bEnableTCC = true
}
};//GearSolenoidProfiles[]
void setup()
**
pinMode( buttonUP, INPUT_PULLUP );
lastUp = digitalRead( buttonUP ); //set initial button state
pinMode( buttonDOWN, INPUT_PULLUP );
lastDn = digitalRead( buttonDOWN ); //set initial button state
pinMode( modeswitch, INPUT ); //modeswitch set as input
pinMode( solA, OUTPUT ); //Solenoid A set as output
pinMode( solB, OUTPUT ); //Solenoid B set as output
pinMode( TCC, OUTPUT ); //TCC set as output
digitalWrite( solA, LOW ); //set intital state as off
digitalWrite( solB, LOW );
digitalWrite( TCC, LOW );
//internal flag for TCC status
bTCCStatus = false;
gearSelection = 0; //start in "1st" gear for this test
lastGearSelection = 0xff; //ensure we change into correct gear first pass by making last != current
}//setup
void loop()
**
Gear_Selection_Control();
Gear_Solenoid_Control();
TCC_Control();
}//loop
void Gear_Selection_Control( void )
**
byte
btnState;
btnState = ReadButtons();
switch( btnState )
**
case NO_PRESS:
//nothing pressed or not read (interval not elapsed); no action
break;
case BUTTON_UP_PRESSED:
if( gearSelection < (NUM_FWD_GEARS-1) )
gearSelection++;
break;
case BUTTON_DOWN_PRESSED:
if( gearSelection > 0 )
gearSelection--;
break;
default:
//only remaining possibility is both pressed; ignore with no action
break;
}//switch
}//void
void Gear_Solenoid_Control( void )
**
if( gearSelection != lastGearSelection )
**
lastGearSelection = gearSelection;
digitalWrite( solA, GearSolenoidProfiles[gearSelection].solenoid_A );
digitalWrite( solB, GearSolenoidProfiles[gearSelection].solenoid_B );
//if the gear just selected enables the TCC, start the hold-off timer
if( GearSolenoidProfiles[gearSelection].bEnableTCC == true )
**
timeTCCSolenoid = millis();
}//if
}//if
}//Gear_Control
void TCC_Control( void )
**
//is TCC now off?
if( bTCCStatus == false )
**
//is TCC enabled?
if( GearSolenoidProfiles[gearSelection].bEnableTCC == true )
**
//has hold-off time passed?
if( millis() - timeTCCSolenoid >= TCC_DELAY )
**
//turn on TCC
digitalWrite( TCC, HIGH );
bTCCStatus = true;
}//if
}//if
}//if
else
**
//TCC is on now; is TCC disabled now?
if( GearSolenoidProfiles[gearSelection].bEnableTCC == false )
**
//turn off TCC
digitalWrite( TCC, LOW );
bTCCStatus = false;
}//if
}//else
}//TCC_Control
//returns a mask:
//0b00000000 - no buttons pressed
//0b00000001 - up pressed
//0b00000010 - down pressed
//0b00000011 - both pressed
//
byte ReadButtons( void )
**
static unsigned long
timeButton = 0;
unsigned long
tNow;
byte
retval,
nowButton;
retval = NO_PRESS;
tNow = millis();
if( (tNow - timeButton) >= BUTTON_READ_INTERVAL )
**
//set up for next read interval
timeButton = tNow;
//read the button and set the flags
nowButton = digitalRead( buttonUP );
if( nowButton != lastUp )
**
lastUp = nowButton;
if( nowButton == LOW )
retval |= BUTTON_UP_PRESSED;
}//if
nowButton = digitalRead( buttonDOWN );
if( nowButton != lastDn )
**
lastDn = nowButton;
if( nowButton == LOW )
retval |= BUTTON_DOWN_PRESSED;
}//if
}//if
return retval;
}//ReadButtons
