Timer circuit does not work as intended (fixed)

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I am trying to make a 1 Hz clock with a CD4060, a crystal oscillator and an Arduino UNO. The problem is I am pretty sure the circuit does not work right. It oscillates but it is slower than 1 Hz.

I don’t have right now any way to make timing measurement (I try to avoid making one I just compare the serial output of Arduino by looking to windows clock). I would be happy with something that counts seconds with a small error.

The circuit oscillates if I take out the 470k resistor which means it does not use the crystal… The 4060 contains an internal oscillator, how to disable it? Any information would be appreciated.

EDIT:

The circuit in my case worked with the following values (in contrast with the values mentioned on the old or the newer datasheet):

both capacitors 100pF The capacitor on the (11) pin connected with some wire to add some capacitance.

Resistor 11-10 -> 1M

Second resistor 300k

corrected circuit:

Arduino divide by two, counting seconds and measuring period:

//———————————————————————————————-//

#include "printf_function.h"

#pragma GCC optimize ("Os")

bool state = false; 
uint8_t seconds = 0;
uint32_t time_stamp = 0;
uint32_t PreviousMillis = 0;
uint32_t m_i = 0;

void blink(){ 

    state = !state; 

    if( state ){
        m_i = millis();
        time_stamp = m_i - PreviousMillis; 
        PreviousMillis = m_i; 
        serial_printf( Serial, "%i   %i\n", seconds, time_stamp );
        if( seconds++ > 58 ) seconds = 0;
    }

}

void setup(){

    pinMode( 2, INPUT );
    pinMode( 13, OUTPUT );
    digitalWrite( 13, LOW );
    Serial.begin( 9600 );
    attachInterrupt( digitalPinToInterrupt( 2 ), blink, RISING );

} 

void loop(){ } 


//----------------------------------------------------------------------------------------------//

Thanks

timercrystaldiy

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edited 8 mins ago

asked 2 hours ago

John Am

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• Please edit your question and add a schematic. The PCB layout doesn’t cut it as a circuit diagram. – TonyM 2 hours ago
• Well, you need a 32.768kHz crystal to make an oscillator and count it down to 1Hz. Ref: CD4060 14 stage Binary Counter and Oscillator – TI ti.com/lit/ds/symlink/cd4060b.pdf – tlfong01 2 hours ago   
• Why do you think it’s unnecessary…how can others find a circuit fault in a circuit they can’t see? – TonyM 2 hours ago 
• @John Am: This new datasheet explains how to use an external clock input at terminal RS: CD4060 14 stage Binary Counter and Oscillator – NXP 2021 assets.nexperia.com/documents/data-sheet/HEF4060B.pdf NXP2021 – tlfong01 1 hour ago  
• @tlfong01 Thank you – John Am 1 hour ago

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