Hi
I am just a hobbyist using electronics in my retirement.
I have recently made a light chaser and then made it move up the line of 10 leds and then back down etc etc. I used a 4069 inverter circuit to produce the clock pulses followed by a 4510 U/D counter feeding a 40218 1 to 10 decoder. The 1st and 10th outputs from the decoder fed a 4043 SET/RESET flip flop to get a signal to control the U/D of the 4510 counter. This all went well.
Now I tried to add a delay after each forward and backward light chase. This has run into serious problems based on the signal I take to initiate a delay (providing 2 seconds from a 555 monostable). The 555 requires a momentary high to low signal at its "trigger" pin 2 and this signal was taken from the working circuit BUT once the 555 received the signal and output its high signal, this high signal stayed because it stops not only the light chase but also locks the signal I used to trigger the 555.
The trigger pulse has to be from high to low to high and shorter than the required 2 second output. If the trigger signal remains low, the 555 signal stays high (no timing allowed until the trigger signal goes back to high).This puts me into a vicious circle.
Please help me if possible. I need to get an up - down signal using a high to low signal. If this is possible, it will provide the 2 second delay and then permit the clock signal to continue and thereby remove the trigger signal which locks during the delay time.
I am just a hobbyist using electronics in my retirement.
I have recently made a light chaser and then made it move up the line of 10 leds and then back down etc etc. I used a 4069 inverter circuit to produce the clock pulses followed by a 4510 U/D counter feeding a 40218 1 to 10 decoder. The 1st and 10th outputs from the decoder fed a 4043 SET/RESET flip flop to get a signal to control the U/D of the 4510 counter. This all went well.
Now I tried to add a delay after each forward and backward light chase. This has run into serious problems based on the signal I take to initiate a delay (providing 2 seconds from a 555 monostable). The 555 requires a momentary high to low signal at its "trigger" pin 2 and this signal was taken from the working circuit BUT once the 555 received the signal and output its high signal, this high signal stayed because it stops not only the light chase but also locks the signal I used to trigger the 555.
The trigger pulse has to be from high to low to high and shorter than the required 2 second output. If the trigger signal remains low, the 555 signal stays high (no timing allowed until the trigger signal goes back to high).This puts me into a vicious circle.
Please help me if possible. I need to get an up - down signal using a high to low signal. If this is possible, it will provide the 2 second delay and then permit the clock signal to continue and thereby remove the trigger signal which locks during the delay time.
