hello! ok with the external switch the value decrease, but what is the funcion of the internal oscillator?
with the internal oscillator the value dont decrease alone?
I just told you, no.
The counter will only count up/down, while the “count input” is active (with external switch).
The purpose is measuring the time wish is the external contact is closed.
If you haven’t such input, this counter is useless, than you can use also a simple watch.
Sorry to insist, but on page 2, Features & Specifications, it says has one of the features: An internal oscillator allows time measurement.
Does this means, that if a certain contact is established by the K8035, it starts count, UP or DOWN, second after second, like a time counter?
If not, I am looking for a time counter, to count elapsed time during a Pit Stop (F1 wheel change). After START signal (pushing a button), the clock will start to count in seconds measurement and, when the person finishes it, pushing another or same button, the clock stops and shows elapsed time.
Perfect would be a clock with mm:ss,sss but, I would take an mm:ss configuration.
Can you please help? I have already purchased the K8035, it’s running and working fine, except I cannot find the “Time measurement” as stated in the Instruction Manual.
I have just built the K8035 and wished to use it as a timer. The instructions are not very clear and the comment from Vellman earlier ‘to use a watch’ was not helpful.
To count time, apart from SW4 being on, pin 9 on the external connector needs to be connected to +5v after initialisation.
D7 is a protection diode. This diode serves to protect the PNP transistor T5.
This if you would connect a relay to the output terminal no. 5 and 4 of connector SK1.
(see page 9 fig. 1.0 & 2.0 for illustration, so you don’t need to add extra diode over the coil of relay)