ok so i bought 5 of the above modules from ali express, to use as a switch debouncer for 4017 led sequencer.
i have tried 5 different momentary tactile switches wired using 7/0.2 stranded hook up wire, about < 1 metre in length.
this is connected between the ground and trigger pin of the module.

all triggered eratically if at all, testing on a breadboard and using an led for output (with 1k resistor) but using a short single core wire ~5cm on the ground and trigger pin worked with no problem ???? tiggered every time on touching the wires.

adding a 1k resistor between the vcc (9v) and one side of the switch did not help matters.

any suggestions to make the module work with ~1m switch wires.
or
suggest a very simple debounce circuit that would work ?
thanks in anticipation
dave

 

Should work with the switch.
What is the output pulse time set to?

 

its quite short,probably about 200ms or less

 

adding a 0.1uf cap between the gnd and trigger pin (across the switch) did not help

 

its quite short,probably about 200ms or less

Try increasing its length.

Was the added resistor connected between V+ and the trigger input?

Can you post the switch specs?

 

resistor was placed between vcc and one side of the switch, the other side of the switch went to gnd.
i need a short pulse of 200ms or less, so i can toggle the next cue rapidly if needed.
i have no specs on the switch just a cheap momentary tactile button switch. i also tried a micro-switch, which didnt wor either, tried 5 switches in all.

 

i think the module has its own pull up resistor so the 1k resistor is probably not needed

 

it works with a larger 555monostable module see pic , but i was trying to miniturise it using the dw-44 module.

 

switch debouncer for 4017 led sequencer

What is the manufacturer of the CD4017? If it has a Schmitt input on the clock, you can use a capacitor and resistor to debounce the switch and eliminate the timer modules.

 

no clear markings on the chip, i am trying the following circuit, see pic.
10k resistor to +9v supply

 

well that didnt work at all, no trigger output ??

 

Do these pics match your module? It should only take a moment to beep out and sketch a schematic.
Note the 555 has been improved for the People, for the Nation with a die-shrink so I would not expect the IC's to be stellar. It must be AC-coupled to /TRIGGER through a cap. I'm guessing the diode is for power-on reset.

 

no clear markings on the chip, i am trying the following circuit, see pic.

well that didnt work at all, no trigger output ??

If the CD4017 doesn't have a Schmitt input on the clock, a slow rise time isn't guaranteed to work.

 

i beleive the 4017BE does have a schmitt trigger, which should take care of a slow rise time.
yes those are the modules i am trying to use.
tracing a schematic even if i were capable wouldnt presumably help me use the module

 

What is the manufacturer of the CD4017? If it has a Schmitt input on the clock, you can use a capacitor and resistor to debounce the switch and eliminate the timer modules.

how would i use a cap and resistor to do this?

 

how would i use a cap and resistor to do this?

The CD4017BE clock input requires a positive edge to trigger. So a transistor can be used to invert the switch signal.
Like this:

 

ok, so i have got a simple work around using a 4N25 opto isolator to turn on and short the trigger pin and ground pin of the dw44 monostable.

i can have long wires to the opto,
IT WORKS GREAT!!