cosminnci
Member
I use a maple ret5 with an 10k pull down resistor and a button when pressed connects to +5v, on another pin I use a relay board, with transistor and diode, this switches on and off a 220V solenoid, somehow the interrupt fires at every switch, rarely misses.
if I completly disconnect the button it works ok.
how can I debug this?
do I need somme hardware changes?
regards,
Cosmin
cosminnci
Member
it is more complex but we tried with simple example and same behavior, we tested with pin38 the onboard button and it works.
could it be of the wires? somme kind of interference?
#define PIN_BUTTON_STOP 38
boolean trigg = false;
void isr_stopProgram(){
trigg = !trigg;
}
void setup(){
pinMode( PIN_BUTTON_STOP, INPUT );
attachInterrupt( PIN_BUTTON_STOP, isr_stopProgram, FALLING );
}
void loop(){
SerialUSB.println( trigg );
delay(1000);
}
pici
Member
#define BUTTON_MASTER xxyourpin
// button state
volatile int buttonMasterState = LOW;
void __button_master_irq()
{
static unsigned long last_master_irq = 0;
unsigned long irq_time = millis();
// If interrupts come faster than 100ms, assume it's a bounce and ignore
if (irq_time - last_master_irq > 200)
{
buttonMasterState = !buttonMasterState;
digitalWrite( LED_MASTER, !buttonMasterState);
fs20_cancel = true;
}
last_master_irq = irq_time;
}
void setup()
{
// define the button pin's, pullup to 3.3 V
pinMode( BUTTON_MASTER, INPUT_PULLUP );
attachInterrupt (BUTTON_MASTER, __button_master_irq, CHANGE);
}
Hi Cosmin,
am not quite sure if this is you are looking for.
For my project it works pretty good. I think you have to debounce your button.
best regards
pici
Member
ups, i am not sure. Does it still fire when you use INPUT_PULLUP mode ?
The only thing i can imagine so far is when your input is pulled down - there could be any strange emitting source
that could cause your input to peak high for a short time. So the time delay in the irq routine should work as a filter.
May be you can adjust the time delay.
I figured that out when i was developing my remote controlled power line. There are a lot of transmitting sources in the air
like RC, mobile, etc.
So the best way would be to check the input with a oscilloscope or dso to figure out the shape of the signal.
But i think it shouldn't happen with the internal pullup mode so u need no external resistor.
regards pici
mbolivar
LeafLabs
just one thing, you're trying to detect a falling edge with a pull-down resistor? It should be a rising edge, or a pull-up resistor...
I agree with blackswords (I didn't read your first post carefully, and missed that you were using a pulldown). If you have an external pulldown (and INPUT mode), then you want RISING, not FALLING.
Though it's still a good idea to check if just using the internal pullups/pulldowns won't work for you.
cosminnci
Member
I tried with INPUT_PULLUP and RISING, the functionality is about the same,
when the maple is powered from battery it works ok, when powered from the same supply as the relay the interrupt fires at same rate as enabling the relay.
what is the safer for button with interrupt on 10cm rainbow cable the pullup or the pulldown, I mean for protection against interferences.
regards,
Cosmin
pici
Member
- what power source you use for the relay, is it stabilized ?
- is the irp acitvated after relais activation ?
- can you monitor the power source with a osci ?
looks like a problem with a dirty power source.
try to stabilize the pwr source with a capacitor, may be 100yF.
regards pici
cosminnci
Member
I have a 12V transformer rectifier bridge 7812 ,7805 and 2 electrolytic caps.
I checked the supply with a dso nano looks smooth, it drops about 0.2v when the relay is on.
we tried activating the interrupt in the main loop too, no changes.
it must be somme interference,
I will rebuild the cable and the connections.
regards,
Cosmin
pici
Member
http://arduino-info.wikispaces.com/RelayIsolation
May be this helps....
regards pici
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