An electric motor is more simple than an petrol or diesel engine but it still needs careful management and I'm not very methodical. The part I'm doing is not as complicated as it looks as in theory like you say it's just a big heavy ebike with four wheels but I'm making a pigs ear of it. Screwing cheap Chinese timer relay modules to an alloy plate using metal pillars was not one of my smarter moves.
Good work. I'll update page one to show this.
This means a lot mate, thank you.
Sounds exiting, please keep us updated.
Sounds interesting. Using the Tesla drive unit as a sort of powered centre diff is a nice way to achieve AWD, while retaining the Freelander running gear. It has worked well on an LR Defender.
I agree it is interesting - you should start a thread to discuss it.
Already done.
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If I ever meet the idiot I'll give him a piece of my mind.These bloody car designers, never think about the poor bloke who's got to maintain it
Yes it is adjustable through the software on the Arduino but if I have just trashed both valves I'll need an alternative.
If the vacuum switch is designed for braking systems, then it should be calibrated to function in the correct range. I'm a fan of keeping things simple, a switch being simpler than a software tweak.Yes it is adjustable through the software on the Arduino but if I have just trashed both valves I'll need an alternative.
Good point on the vac booster diaphram. I'll hold on to the the spare booster from the other car in case of future problems but will dial back the vac.
I ordered a couple of these https://ebay.us/PXbzCF but they'll be a few days coming.
In the meantime months ago I had bought a Volvo vacuum switch which might do the job. It is self contained so doesn't need controlling but also can't be adjusted, nor do I have a connector for it but after lunch I'll give it a go.
What's the worst can happen?
I agree but I already have the other setup so will give it another try, also I don't have the correct connector for the switch and when testing it blew a five amp fuse so I'm uncertain about it.If the vacuum switch is designed for braking systems, then it should be calibrated to function in the correct range. I'm a fan of keeping things simple, a switch being simpler than a software tweak.
#define DEBUG 1 // comment this out to turn off serial comms once you've set the threshold & hysteresis
#define SENSE_PIN A0 // connect to the output of the sensor - you also need to feed it 5V and gnd
#define RELAY_PIN 10 // connect to the relay input. Check whether the relay is active high or low!
#define HYSTERESIS 50 // stops the pump cycling on and off when close to threshold
#define THRESHOLD 250 // Where does it turn on/off. Can't remember what my final number was but this is a good start
void setup() {
//Coolant pump controller setup
// Set-up PWM on the Arduino UNO at 1Hz on Digital pin D9
pinMode(9, OUTPUT); // Set digital pin 9 (D9) to an output
TCCR1A = _BV(COM1A1) | _BV(WGM11); // Enable the PWM output OC1A on digital pins 9
TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS12); // Set fast PWM and prescaler of 256 on timer 1
ICR1 = 31249; // Set the PWM frequency to 2Hz: 16MHz/(256 * 2Hz) - 1 = 31249
OCR1A = 14062; // Set the duty-cycle to approx 45%: 31249 / 45 = 14062 30 = 9374
//Vacuum pump controller Setup
#ifdef DEBUG
Serial.begin(9600);
Serial.println("Debug Mode: Serial Comms Enabled");
Serial.print("Threshold: ");
Serial.println(THRESHOLD);
Serial.print("Hysteresis: ");
Serial.println(HYSTERESIS);
#endif
pinMode(SENSE_PIN, INPUT);
pinMode(RELAY_PIN, OUTPUT);
#ifdef DEBUG
Serial.println("Pump Priming");
#endif
digitalWrite(RELAY_PIN, LOW);
delay(5000);
digitalWrite(RELAY_PIN, HIGH);
}
void loop()
{
int value = analogRead(SENSE_PIN);
#ifdef DEBUG
Serial.print("ANALOG READ: ");
Serial.println(value);
delay(100);
#endif
if (value > (THRESHOLD + HYSTERESIS)) {
digitalWrite(RELAY_PIN, LOW);
#ifdef DEBUG
Serial.println("RELAY ON");
#endif
}
else if ( value < THRESHOLD - HYSTERESIS)
{
digitalWrite(RELAY_PIN, HIGH);
#ifdef DEBUG
Serial.println("RELAY OFF");
#endif
}
else
{
// do nothing
}
}
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