Crosmax, Code for above post as unable to attach .ino file. Rename as tester.ino.
#include <ESP8266WiFi.h>
#define VALVE_A_CONTROL_PIN 0 // GPIO0 (D3 on ESP-12E with ESP Motor Chield)
#define VALVE_A_ENABLE_PIN 5 // GPIO5 (D1 on ESP-12E with ESP Motor Chield)
void setup(void)
{
Serial.begin(115200);
Serial.printf("Setting up pins\n");
pinMode(LED_BUILTIN, OUTPUT);
pinMode(VALVE_A_CONTROL_PIN, OUTPUT);
pinMode(VALVE_A_ENABLE_PIN, OUTPUT);
digitalWrite(VALVE_A_ENABLE_PIN, HIGH);
Serial.printf("Starting loop\n");
}
void loop(void) {
Serial.printf(".");
digitalWrite(LED_BUILTIN, 1);
digitalWrite(VALVE_A_CONTROL_PIN, 1);
delay(2000);
digitalWrite(LED_BUILTIN, 0);
digitalWrite(VALVE_A_CONTROL_PIN, 0);
delay(2000);
}