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Bootup GPIO States
| Pin | @startup |
| Pin | @startup |
|---|
| 3v3 | - |
| 5v | - |
|---|
| GPIO 2 | HIGH |
| 5v | - |
|---|
| GPIO 3 | HIGH |
| GND | - |
|---|
| GPIO 4 | HIGH |
| GPIO 14 (TxD) | - |
|---|
| GND | - |
| GPIO 15 (RxD) | - |
|---|
| GPIO 17 | LOW |
| GPIO 18 | LOW |
|---|
| GPIO 27 | LOW |
| GND | - |
|---|
| GPIO 22 | LOW |
| GPIO 23 | LOW |
|---|
| 3v3 | - |
| GPIO 24 | LOW |
|---|
| GPIO 10(MOSI) | LOW |
| GND | - |
|---|
| GPIO 9(MISO) | LOW |
| GPIO 25 | LOW |
|---|
| GPIO 11(SCLK) | LOW |
| GPIO 8 | ~0.5v |
|---|
| GND | - |
| GPIO 7 | ~0.5v |
|---|
| ID_SD | - |
| ID_SC | - |
|---|
| GPIO 5 | HIGH |
| GND | - |
|---|
| GPIO 6 | HIGH |
| GPIO 12 | LOW |
|---|
| GPIO 13 | LOW |
| GND | - |
|---|
| GPIO 19 | LOW |
| GPIO 16 | LOW |
|---|
| GPIO 26 | LOW |
| GPIO 20 | LOW |
|---|
| GND | - |
| GPIO 21 | LOW |
|---|
Python Sample Code
> vi sample.py
# External module imports
import RPi.GPIO as GPIO
import time
# Pin Definitons:
PIN_TRUNK_SENSOR = 27
PIN_DOOR_SENSOR = 6
PIN_DOOR_1 = 12
PIN_DOOR_2 = 25
PIN_TRUNK_1 = 22
PIN_TRUNK_2 = 13
# Pin Setup:
GPIO.setmode(GPIO.BCM)
GPIO.setup(PIN_TRUNK_SENSOR, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(PIN_DOOR_SENSOR, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(PIN_DOOR_1, GPIO.OUT)
GPIO.setup(PIN_DOOR_2, GPIO.OUT)
GPIO.setup(PIN_TRUNK_1, GPIO.OUT)
GPIO.setup(PIN_TRUNK_2, GPIO.OUT)
# Initial state
GPIO.output(PIN_DOOR_1, GPIO.LOW)
GPIO.output(PIN_DOOR_2, GPIO.LOW)
GPIO.output(PIN_TRUNK_1, GPIO.LOW)
GPIO.output(PIN_TRUNK_2, GPIO.LOW)
doorSensorVal=False
trunkSensorVal=False
newDoorSensorVal=False
newTrunkSensorVal=False
print("Here we go! Press CTRL+C to exit")
try:
while 1:
#read DOOR sensors
newDoorSensorVal=GPIO.input(PIN_DOOR_SENSOR)
if (newDoorSensorVal != doorSensorVal):
doorSensorVal=newDoorSensorVal
if(doorSensorVal==True):
#lock
print(">DOOR SENSOR = LOW (LOCK)")
GPIO.output(PIN_DOOR_1, GPIO.HIGH)
GPIO.output(PIN_DOOR_2, GPIO.LOW)
time.sleep(0.075)
GPIO.output(PIN_DOOR_1, GPIO.LOW)
GPIO.output(PIN_DOOR_2, GPIO.LOW)
else:
print(">DOOR SENSOR = HIGH (UNLOCK)")
GPIO.output(PIN_DOOR_1, GPIO.LOW)
GPIO.output(PIN_DOOR_2, GPIO.HIGH)
time.sleep(0.075)
GPIO.output(PIN_DOOR_1, GPIO.LOW)
GPIO.output(PIN_DOOR_2, GPIO.LOW)
#read TRUNK sensors
newTrunkSensorVal=GPIO.input(PIN_TRUNK_SENSOR)
if (newTrunkSensorVal != trunkSensorVal):
trunkSensorVal=newTrunkSensorVal
if(trunkSensorVal==True):
#lock
print(">TRUNK SENSOR = LOW (LOCK)")
GPIO.output(PIN_TRUNK_1, GPIO.HIGH)
GPIO.output(PIN_TRUNK_2, GPIO.LOW)
time.sleep(0.075)
GPIO.output(PIN_TRUNK_1, GPIO.LOW)
GPIO.output(PIN_TRUNK_2, GPIO.LOW)
else:
print(">DOOR SENSOR = HIGH (UNLOCK)")
GPIO.output(PIN_TRUNK_1, GPIO.LOW)
GPIO.output(PIN_TRUNK_2, GPIO.HIGH)
time.sleep(0.075)
GPIO.output(PIN_TRUNK_1, GPIO.LOW)
GPIO.output(PIN_TRUNK_2, GPIO.LOW)
except KeyboardInterrupt: # If CTRL+C is pressed, exit cleanly:
GPIO.cleanup() # cleanup all GPIO
Run the program
> sudo python sample.py
NodeJS Sample Code
The onoff library has show to be buggy! Use gpio library instead.
var Gpio = require('onoff').Gpio; //include onoff to interact with the GPIO
var LED = new Gpio(4, 'out'); //use GPIO pin 4, and specify that it is output
var blinkInterval = setInterval(blinkLED, 250); //run the blinkLED function every 250ms
function blinkLED() { //function to start blinking
if (LED.readSync() === 0) { //check the pin state, if the state is 0 (or off)
LED.writeSync(1); //set pin state to 1 (turn LED on)
} else {
LED.writeSync(0); //set pin state to 0 (turn LED off)
}
}
function endBlink() { //function to stop blinking
clearInterval(blinkInterval); // Stop blink intervals
LED.writeSync(0); // Turn LED off
LED.unexport(); // Unexport GPIO to free resources
}
setTimeout(endBlink, 5000); //stop blinking after 5 seconds
References