Hello,
I am currently working on a subject with a Seeduino XIAO SAMD21 and (x 4) 6V 2-Position 3-Way Air Valves. My system is currently powered by the usb Plug of my computer of the XIAO.
My problem is the following, I am running a program which use the valve one by one and works well. However, at the startup,all the vanes turns on for a few second as if all pins were set in high state mode by default. Despite the fact that I write them all to LOW in OUTPUT mode in the setup().
PS : Sorry my code is in frensh 
Could somoene help me with that ?
#include <Arduino.h>
// 4 Pins Enable
#define PIN_ENABLE_ELECTRO_1 1
#define PIN_VENTILO 4
#define PIN_ENABLE_ELECTRO_2 2
#define PIN_ENABLE_ELECTRO_3 3
#define PIN_ENABLE_ELECTRO_4 9
#define PIN_COMMUNICATION_LORA 5
#define PIN_LED_TEST 7
const uint16_t delai_ouverture_electrovanne = 5000;
const uint16_t delai_attente = 1;
//Variables
int counter=0;
const double_t seuil_altitude[] = {0,1000,1500,}; // Définit les 4 différents seuils d'altitudes pour déclencher les expériences
const int electro_vannes[] = {PIN_ENABLE_ELECTRO_1, PIN_ENABLE_ELECTRO_2, PIN_ENABLE_ELECTRO_3, PIN_ENABLE_ELECTRO_4}; // Définit les PINS des 4 électrovannes (pour y avoir accès via un indice)
// 1 Pins Inputdefine
#define PIN_ELECTROVANNE_MUTUAL_INPUT 10
// put function declarations here:
void lock_electro(uint8_t vanne_1,u_int16_t c_delay){
/*Active une électroVanne (vanne_1) pendant un délai (c_delay)
*params:
*uint8_t : vanne_1 : Pin de la vanne Ă activer
*int16_t : c_delay : Delai d'activation de l'electrovanne
*/
digitalWrite(vanne_1,HIGH);
digitalWrite(PIN_LED_TEST,HIGH);
digitalWrite(PIN_VENTILO,HIGH);
digitalWrite(PIN_ELECTROVANNE_MUTUAL_INPUT,HIGH);
delay(c_delay);
digitalWrite(vanne_1,LOW);
digitalWrite(PIN_LED_TEST,LOW);
digitalWrite(PIN_VENTILO,LOW);
digitalWrite(PIN_ELECTROVANNE_MUTUAL_INPUT,LOW);
}
/* int select_eletro(double_t altitude, const double_t seuil_altitude[]){
int selected_index = 0;
for(int i=0;i<4;i++){
if (seuil_altitude[i] < altitude) {
selected_index = i;
}
}
return selected_index;
} */
void setup() {
// DĂ©finition des PIN Electrovanne Enable en mode OUTPUT
pinMode(PIN_ENABLE_ELECTRO_1,OUTPUT);
pinMode(PIN_ENABLE_ELECTRO_2,OUTPUT);
pinMode(PIN_ENABLE_ELECTRO_3,OUTPUT);
pinMode(PIN_ENABLE_ELECTRO_4,OUTPUT);
// DĂ©finition du Pin Ventilo
pinMode(PIN_VENTILO,OUTPUT);
// DĂ©finition des pins Electrovanne commun
pinMode(PIN_ELECTROVANNE_MUTUAL_INPUT,OUTPUT);
pinMode(PIN_LED_TEST,OUTPUT);
// Activation par défaut des Pins
pinMode(PIN_COMMUNICATION_LORA,INPUT);
digitalWrite(PIN_ENABLE_ELECTRO_1,LOW);
digitalWrite(PIN_ENABLE_ELECTRO_2,LOW);
digitalWrite(PIN_ENABLE_ELECTRO_3,LOW);
digitalWrite(PIN_ENABLE_ELECTRO_4,LOW);
digitalWrite(PIN_ELECTROVANNE_MUTUAL_INPUT,LOW);
}
void loop() {
while(digitalRead(PIN_COMMUNICATION_LORA)!=HIGH){
delay(delai_attente);
}
counter+=1;
if (counter==0){return;}
else if(counter>0 && counter <5){
lock_electro(electro_vannes[counter-1],delai_ouverture_electrovanne);
}
delay(1000);
}
