Hi All,
After watching the following video of Hollow Clock:
I decided to try building one of my own.
All items were bought according to what we see in the video :
1.Node MCU(8266)
2. DC DC Boost Step Up Converter 2.6-5.5V to 5V
3. Stepper Motor 28byj 48 Uln2003 5v
Everything were wired according to the following scheme :
Below is the code loaded to the card:
// Hollow Clock improved by SnowHead, Mart 2021
//
// Thanks to:
// shiura for stepper motor routines
// SnowHead for Internet-Time
#include "WTAClient.h"
#define ROTATION_PERIOD_IN_SEC 1
#define CREEPING_HANDS 0 // set to 1 for smooth hands movement (needs more current, motor becomes hotter)
extern unsigned long askFrequency;
// Motor and clock parameters
#define STEPS_PER_ROTATION 4096L // steps of a single rotation of motor (motor: 64 steps/rotation, gear: 1/64)
#define RATIO 5 // minutes per a rotation (minutes wheel: 120 teeth, motors pinion: 10 teeth)
// wait for a single step of stepper
#define HIGH_SPEED_DELAY 3 // minimal delay for highest speed, delay is calculated from steps and period
unsigned int delaytime;
//=== CLOCK ===
WTAClient wtaClient;
unsigned long locEpoch = 0, netEpoch = 0, start_time;
#define LED 16
#define PHASES 8
// ports used to control the stepper motor
// if your motor rotate to the opposite direction,
// change the order to {15, 13, 12, 14};
// ESP Stepper
// D5 -> IN1
// D6 -> IN2
// D7 -> IN3
// D8 -> IN4
int port[4] =
{ 14, 12, 13, 15 };
int seq[PHASES][4] =
#if (PHASES == 4)
{
{ HIGH, LOW, HIGH, LOW },
{ LOW, HIGH, HIGH, LOW },
{ LOW, HIGH, LOW, HIGH },
{ HIGH, LOW, LOW, HIGH },
#else
// sequence of stepper motor control
{
{ LOW, HIGH, HIGH, LOW },
{ LOW, LOW, HIGH, LOW },
{ LOW, LOW, HIGH, HIGH },
{ LOW, LOW, LOW, HIGH },
{ HIGH, LOW, LOW, HIGH },
{ HIGH, LOW, LOW, LOW },
{ HIGH, HIGH, LOW, LOW },
{ LOW, HIGH, LOW, LOW },
#endif
};
void rotate(int step)
{
static int phase = 0;
int i, j;
int delta = (step > 0) ? 1 : 7;
#if DEBUG
unsigned long ts = millis();
Serial.print("rotating steps: ");
Serial.println(step);
#endif
step = (step > 0) ? step : -step;
for (j = 0; j < step; j++)
{
phase = (phase + delta) % PHASES;
for (i = 0; i < 4; i++)
{
digitalWrite(port[i], seq[phase][i]);
}
#if DEBUG
digitalWrite(LED, j & 1);
#endif
#if CREEPING_HANDS
delay(delaytime);
#else
delay(HIGH_SPEED_DELAY);
#endif
}
// power cut
for (i = 0; i < 4; i++)
{
digitalWrite(port[i], LOW);
}
#if DEBUG
digitalWrite(LED, 1);
Serial.print("needed milliseconds: ");
Serial.println(millis()-ts);
#endif
#if ! CREEPING_HANDS
if(digitalRead(0))
{
delay(100);
}
#endif
}
long calc_step(int sec)
{
long steps;
static double round_accu = 0.0;
double fsteps = (double)STEPS_PER_ROTATION * sec / 60.0 / (double)RATIO;
double tsteps;
round_accu += modf(fsteps, &tsteps);
steps = (long)tsteps;
round_accu = modf(round_accu, &tsteps);
steps += (long)tsteps;
#if CREEPING_HANDS
if(steps)
{
delaytime = ((ROTATION_PERIOD_IN_SEC * 1000L) - 250) / labs(steps);
if(delaytime < HIGH_SPEED_DELAY)
{
delaytime = HIGH_SPEED_DELAY;
}
}
#endif
return steps;
}
void setup()
{
start_time = millis();
pinMode(port[0], OUTPUT);
pinMode(port[1], OUTPUT);
pinMode(port[2], OUTPUT);
pinMode(port[3], OUTPUT);
pinMode(0, INPUT_PULLUP);
#if DEBUG
pinMode(LED, OUTPUT);
digitalWrite(LED, 1);
#endif
Serial.begin(115200);
wtaClient.Setup();
askFrequency = 50;
}
void loop()
{
#if ! DEBUG
if(!digitalRead(0))
{
delaytime = HIGH_SPEED_DELAY;
while(!digitalRead(0))
{
rotate(1);
Serial.println("teststep");
delay(200);
}
}
#endif
#if (ROTATION_PERIOD_IN_SEC == 1)
while(((netEpoch = wtaClient.GetCurrentTime()) == locEpoch) || (!netEpoch))
#else
while(((netEpoch = wtaClient.GetCurrentTime()) % ROTATION_PERIOD_IN_SEC) || (!netEpoch))
#endif
{
delay(100);
}
askFrequency = 60 * 60 * 1000;
if(locEpoch)
{
wtaClient.PrintTime();
if(start_time)
{
delay(1000);
locEpoch -= (millis() - start_time) / 1000;
start_time = 0;
}
rotate(calc_step(netEpoch - locEpoch));
}
else
{
delay(1000);
}
locEpoch = netEpoch;
}
I don't know if this is related to the problem, but at the end of uploading the code I received a message "Leaving.... Hard resetting via RTS pin"
The four lamps of the engine does not light up at all, and likewise the engine does not rotate at all. I tried everything.
I would appreciate your help on this matter.
