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Help with one button relay input switching
Help with one button relay input switching
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Old 5th February 2018, 02:29 PM   #51
satx is offline satx  United States
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Will 771-HEF4017BT-Q100J or 771-HEF4017BTD work?

How about 511-ULN2003A?

Thanks
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Old 5th February 2018, 02:29 PM   #52
Mooly is offline Mooly  United Kingdom
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Help with one button relay input switching
Relay coils ! and button.
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Old 5th February 2018, 02:33 PM   #53
Mooly is offline Mooly  United Kingdom
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Help with one button relay input switching
Any cooking grade 4017 should be fine. Just check the details as often different letters can mean different package outlines. Same for the 2003. Just check the data sheets and be sure.
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Old 5th February 2018, 03:11 PM   #54
satx is offline satx  United States
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Originally Posted by Mooly View Post
Any cooking grade 4017 should be fine. Just check the details as often different letters can mean different package outlines. Same for the 2003. Just check the data sheets and be sure.
Ok thanks
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Old 1st March 2018, 05:04 AM   #55
satx is offline satx  United States
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Ok, I've tried for a while to get this working, but I'm not having any luck. The 4017 is not counting, but Q0 has a constant 12V on it regardless of button push. Even with that pin high though, there is no voltage on pin 16 of the 2003.

I'm guessing I did something wrong (see circuit)

Help would be much appreciated! Thanks!
Attached Files
File Type: pdf 4017 2003 circuit.pdf (18.3 KB, 28 views)
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Old 1st March 2018, 05:08 AM   #56
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by satx View Post
Ok, I've tried for a while to get this working, but I'm not having any luck. The 4017 is not counting, but Q0 has a constant 12V on it regardless of button push. Even with that pin high though, there is no voltage on pin 16 of the 2003.

I'm guessing I did something wrong (see circuit)

Help would be much appreciated! Thanks!
There is no pull down resistor on 4017 switch input.
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Old 1st March 2018, 05:19 AM   #57
satx is offline satx  United States
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Quote:
Originally Posted by nigelwright7557 View Post
There is no pull down resistor on 4017 switch input.

Ok, about 1K? In series with the switch before it connects to CLK? What does this resistor do?

I also tried it with // 220uf/100K from switch/clk to ground. Forgot to include in the circuit

THanks
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Old 1st March 2018, 05:22 AM   #58
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by satx View Post
Ok, about 1K? In series with the switch before it connects to CLK? What does this resistor do?

I also tried it with // 220uf/100K from switch/clk to ground. Forgot to include in the circuit

THanks
The switch pulls the signal up to 12 volts.
The 4k7 resistor pulls it down to ground.
Without a resistor the input floats when switch not pressed.
You will need a small capacitor across the pull down resistor to stop switch bounce causing multiple clock pulses.
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Old 1st March 2018, 05:37 AM   #59
satx is offline satx  United States
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Quote:
Originally Posted by nigelwright7557 View Post
The switch pulls the signal up to 12 volts.
The 4k7 resistor pulls it down to ground.
Without a resistor the input floats when switch not pressed.
You will need a small capacitor across the pull down resistor to stop switch bounce causing multiple clock pulses.
Ok, so the the resistor connects from CLK to GND?

Like I said, I did try it with 100k clk/switch to ground with 220uf across it. No luck. Are the values just wrong or should that have worked?
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Old 1st March 2018, 05:49 AM   #60
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by satx View Post
Ok, so the the resistor connects from CLK to GND?

Like I said, I did try it with 100k clk/switch to ground with 220uf across it. No luck. Are the values just wrong or should that have worked?
Yes 4k7 resistor to ground with 10uf in parallel with resistor.
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