Hi all, New here and hoping to get a bit of guidance. I am working on a program that will use a teensy to turn on an android box in the car to power a simple carputer. I have sorted how to get the device to turn on and now i'm working on a way to get the screen to go into standby. I have accomplished this using a simple switch sensor, but now i cant find a place to mount the sensor. The screen in my car opens and closes, its a 2004 RX-8. I found out that the OEM system uses a potentiometer for screen position, and other users have replaced the entire system with arduino and tapped this pot for screen position. Essentially what i want to do is tell the teensy, the screen is up or its down. I think i sorted the code part. I will include below and you guys can tell me if you see something weird or that could be better.
The question is, can i connect the middle pin of the pot directly to the teensy analog pin in parallel with the existing electronics? The current setup controls opening and closing the screen, so i want to keep that working. my thought was to just pigtail a lead from the existing wiring to the teensy, and then read the pot positions and alter the code accordingly for open and closed positions. I guess what i'm asking is, do all 3 leads from the pot need to be connected to the teensy for it to work, or if it has power and ground from somewhere else can i still get a signal?
Below is my code in case anyone wants to take a look.
THANKS,
RON
// Constant Variables for comparison
const int HoodClosedValue = 950; //suspected pot value for closed
const int HoodPosTolerance = 10; //tolerance stolen from somewhere else
const int HoodOpen = 1; //defined placeholder because there is
//more than one open position
const int HoodClosed = 0; // only one closed position
// CurrentState is the new read state from the pot from Nav Hood
// Old State is the previous state stored in memory
// these values are compared and if a change is registered
// the standby button is pressed. (actualy a virtual button)
int HoodState = 0; //used for initial hood pos function
int CurrentState = 0; //stored value for now
int OldState = 0; //stored value for previous
void setup() {
// put your setup code here, to run once:
// 3 second delay before device turn on
delay(3000);
// pinMode(2, INPUT_PULLUP);
// pin 2 is the nav hood sensor, old setup to test functionality
pinMode(1, OUTPUT);
// Power button input to android box
digitalWrite(1, LOW);
//pulse to turn device on
delay(1000);
pinMode(1, INPUT_PULLUP);
//Release of power button
delay(30000);
// Gives 23 seconds for device to boot
// This is the check to see if hood is intitially up or down
// If open this does nothing, and loop starts after
// matching the old and new state for loop
HoodState=analogRead(A9);
if (HoodState < (HoodClosedValue-HoodPosTolerance)) {
OldState=HoodOpen;
// This records the oldstate as open for the loop
}
// If closed, this puts device into standby mode
else {
pinMode(1, OUTPUT);
digitalWrite(1, LOW);
delay(300);
pinMode(1, INPUT_PULLUP);
// this records the oldstate as closed for loop
// functionality of standby feature
OldState=HoodClosed;
}
}
void loop() {
// put your main code here, to run repeatedly:
//Checks current hood position
HoodState=analogRead(A9);
if (HoodState < (HoodClosedValue-HoodPosTolerance)) {
CurrentState = HoodOpen;
}
else {
CurrentState = HoodClosed;
}
// If position has changed since intialization
// this pulses standby button
if (CurrentState != OldState) {
pinMode(1, OUTPUT);
digitalWrite(1, LOW);
delay(300);
pinMode(1, INPUT_PULLUP);
OldState=CurrentState;
delay(2000);
}
}
The question is, can i connect the middle pin of the pot directly to the teensy analog pin in parallel with the existing electronics? The current setup controls opening and closing the screen, so i want to keep that working. my thought was to just pigtail a lead from the existing wiring to the teensy, and then read the pot positions and alter the code accordingly for open and closed positions. I guess what i'm asking is, do all 3 leads from the pot need to be connected to the teensy for it to work, or if it has power and ground from somewhere else can i still get a signal?
Below is my code in case anyone wants to take a look.
THANKS,
RON
// Constant Variables for comparison
const int HoodClosedValue = 950; //suspected pot value for closed
const int HoodPosTolerance = 10; //tolerance stolen from somewhere else
const int HoodOpen = 1; //defined placeholder because there is
//more than one open position
const int HoodClosed = 0; // only one closed position
// CurrentState is the new read state from the pot from Nav Hood
// Old State is the previous state stored in memory
// these values are compared and if a change is registered
// the standby button is pressed. (actualy a virtual button)
int HoodState = 0; //used for initial hood pos function
int CurrentState = 0; //stored value for now
int OldState = 0; //stored value for previous
void setup() {
// put your setup code here, to run once:
// 3 second delay before device turn on
delay(3000);
// pinMode(2, INPUT_PULLUP);
// pin 2 is the nav hood sensor, old setup to test functionality
pinMode(1, OUTPUT);
// Power button input to android box
digitalWrite(1, LOW);
//pulse to turn device on
delay(1000);
pinMode(1, INPUT_PULLUP);
//Release of power button
delay(30000);
// Gives 23 seconds for device to boot
// This is the check to see if hood is intitially up or down
// If open this does nothing, and loop starts after
// matching the old and new state for loop
HoodState=analogRead(A9);
if (HoodState < (HoodClosedValue-HoodPosTolerance)) {
OldState=HoodOpen;
// This records the oldstate as open for the loop
}
// If closed, this puts device into standby mode
else {
pinMode(1, OUTPUT);
digitalWrite(1, LOW);
delay(300);
pinMode(1, INPUT_PULLUP);
// this records the oldstate as closed for loop
// functionality of standby feature
OldState=HoodClosed;
}
}
void loop() {
// put your main code here, to run repeatedly:
//Checks current hood position
HoodState=analogRead(A9);
if (HoodState < (HoodClosedValue-HoodPosTolerance)) {
CurrentState = HoodOpen;
}
else {
CurrentState = HoodClosed;
}
// If position has changed since intialization
// this pulses standby button
if (CurrentState != OldState) {
pinMode(1, OUTPUT);
digitalWrite(1, LOW);
delay(300);
pinMode(1, INPUT_PULLUP);
OldState=CurrentState;
delay(2000);
}
}
