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> Countdown timer kit, with 5 program timing modes K148
Countdown timer kit, with 5 program timing modes K148
Programmable Countdown Timer Kit
There are five operating modes that control the timer and the output. The RESET input does not affect the operating mode.
Mode 1. Timer Stop, Output Hold (default)
This is the default mode at power up. The timer stops when it reaches zero and the Output goes low and stays low. You have to press Reset (short the Reset pin to ground) to continue.
Mode 2. Timer Overrun, Output Hold
Same as Mode 1 except the timer continues counting down past zero, wraps around to 9999 and starts counting down from there. The Output pin goes low and stays low. Short the Reset pin to ground to return to the preset timer value.
Mode 3. Auto Reset, Pulse Output
When the timer reaches zero the Output pulses low for 20mS and the timer resets itself to the programmed value and stays there. You can start to count down again from the preset value by pressing START.
Mode 4. Timer Overrun, Pulse Output
Same as Mode 2 except the output pulses low for 20msec instead of staying low. Counting wraps to 9999 and starts counting down. Short the Reset pin to ground to return to the preset timer value.
Pressing START turns on the output and starts the timer. When the timer reaches zero the output turns off and the timer resets to the preset value where it stays until START is pressed agan.
Firmware version of this kit is "T0", which is the Countdown timer functions described above.
Note: Kit comes with standard IC socket. You may replace this with Machine Pins socket , as shown in photo.
