Carputer - Automatic boot/shutdown

shaggy63 · Published in 2018-5-14 21:21:28

Edited by shaggy63 at 2018-5-14 21:25

I'm running h3droid on a orangepi pc in my car. I have the orangepi pc plugged into a anker ravpower power pack which is then plugged into my car for power. There's plenty of information on how to shut off the orangepi safely but nothing about turning it back on.

I used a arduino nano hooked to a relay which grounds pin PC04 when power is high on the power pack and ungrounds it when power is low. The relay is also connected to the fan on the oragepipc so when the orangepi is on the fan is also on. I wrote a script that checks the PC04 pin on the orangepi and runs h3fakeoff when it's no longer grounded. Thanks everyone at h3droid for the help and awesome work.

This script is placed in /data/rc.local (Create it if it doesn't exist)

#!/system/bin/sh
/system/bin/sunxi-pio -m PC04'<0><default><default><default>'
x=1
while [ $x -le 1 ]
do
y=`sunxi-pio -m PC04 | tr -d '<' | tr -d '>' | tr -d '\n' |tr -d ' '`
z=PC40111
if [ $z == $y ]
then
sleep 30
/system/bin/reboot -p
fi
sleep 30
done

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Arduino nano code, once programmed plug the arduino into a orangepi usb port.

#define relay A1 // Connect to A1 pin, Ground and +5 on arduino. Connect relay switch to orangepi PC04 and Ground.
#define interval 10000 // 10 seconds
int carpower;
int pistatus;
int powerlvl;
int lowpower=4000;
int highpower=4600;
void setup()
{
pinMode(relay, OUTPUT);
Serial.begin(9600);
digitalWrite(relay, HIGH);
}
void loop()
{
powerlvl = readVcc();
if (powerlvl < lowpower)
{
Serial.print("Power is low Shutting down = ");
Serial.println(lowpower);
delay(60000); // one minute?
digitalWrite(relay, LOW); // Power off
}
if (powerlvl >= highpower)
{
if (pistatus == 0)
{
Serial.println("Turning on CarPC");
digitalWrite(relay, HIGH); // Turn the power to relay on
}
Serial.print("pistatus is = ");
Serial.println(pistatus);
Serial.print("carpower is = ");
Serial.println(carpower);
}
Serial.print("Battery Power = ");
Serial.println(powerlvl);
delay(interval);
}
long readVcc() {
// Read 1.1V reference against AVcc
// set the reference to Vcc and the measurement to the internal 1.1V reference
#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
ADMUX = _BV(MUX5) | _BV(MUX0);
#elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
ADMUX = _BV(MUX3) | _BV(MUX2);
#else
ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#endif
delay(2); // Wait for Vref to settle
ADCSRA |= _BV(ADSC); // Start conversion
while (bit_is_set(ADCSRA,ADSC)); // measuring
uint8_t low = ADCL; // must read ADCL first - it then locks ADCH
uint8_t high = ADCH; // unlocks both
long result = (high<<8) | low;
result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
return result; // Vcc in millivolts
}

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I'll post my h3fakeof when I can, this is from memory.

#Workaround for h3droid h3fakeoff
mount -o rw,remount /system
mv /system/bin/h3fakeoff /system/bin/h3fakeoff.old
cp /system/bin/h3fakeoff.sh /system/bin/h3fakeoff
modify the /system/bin/h3fakeoff to call h3fakeoff.old with -b PC04

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#todo Add temp monitor, add timer to shutdown after an hour of power off so it doesn't completely drain the power pack.

shaggy63 · Published in 2018-5-16 02:14:03

Fixed some variables.

#define relay A1
#define interval 1000 // 10 seconds
int pistatus;
int powerlvl;
int lowpower;
int highpower;
void setup()
{
pinMode(relay, OUTPUT);
Serial.begin(9600);
digitalWrite(relay, HIGH);
lowpower=4000; //Test your battery and see what the dead voltage is * 1000
highpower=4600; // Test your battery and see what it reads once charging power is applied
delay(2000);
powerlvl = readVcc();
pistatus = 1;
}
void loop()
{
powerlvl = readVcc();
if (powerlvl < lowpower)
{
//Lets check again
delay(10000);
powerlvl = readVcc();
if (powerlvl < lowpower)
{
Serial.print("Power is low Shutting down = ");
Serial.println(lowpower);
delay(60000); // one minute?
digitalWrite(relay, LOW); // Power off
pistatus = 0;
}
}
if (powerlvl >= highpower)
{
if (pistatus == 0)
{
Serial.println("Turning on CarPC");
digitalWrite(relay, HIGH); // Turn the power to relay on
pistatus = 1;
}
Serial.print("pistatus is = ");
Serial.println(pistatus);
}
Serial.print("Battery Power = ");
Serial.println(powerlvl);
delay(interval);
}
long readVcc() {
// Read 1.1V reference against AVcc
// set the reference to Vcc and the measurement to the internal 1.1V reference
#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
ADMUX = _BV(MUX5) | _BV(MUX0);
#elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
ADMUX = _BV(MUX3) | _BV(MUX2);
#else
ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
#endif
delay(2); // Wait for Vref to settle
ADCSRA |= _BV(ADSC); // Start conversion
while (bit_is_set(ADCSRA,ADSC)); // measuring
uint8_t low = ADCL; // must read ADCL first - it then locks ADCH
uint8_t high = ADCH; // unlocks both
long result = (high<<8) | low;
result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
return result; // Vcc in millivolts
}

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