I have a timing device triggered by tapeswitches that I would like to make wireless.
At present the tapeswitch is run over by a skateboard at speed and it triggers a clock. A second tapeswitch stops the clock. This works perfectly, and is very similar to a barrel racing system used in rodeos.
I have bought a garage wireless remote and reciever and wired the remote to the tapeswitch by utilising the on/off button. Whilst this woks perfectly when I trigger the tape by my foot or by hand, when I roll a skateboard over the tape the remote triggers for a fraction of a second, which isnt enough to fire the remote off completely or long enough.
What I need to create is a 1 second pulse, tirggered by the tape and I have tried making a 1 second timer using an LM555. This I then connected to a 4N25 optocoupler. Trouble is that the output side of the opto seems to not like acting as a 9v switch, and also the LM555 will switch on for a second but not re-set ready for the next skaters run....
What I need is a simple way of triggering the remote with a long enough simulated button press....whilst taking into account that the input pulse generated by the skater is tiny.
Any ideas? Thanks, Michael
At present the tapeswitch is run over by a skateboard at speed and it triggers a clock. A second tapeswitch stops the clock. This works perfectly, and is very similar to a barrel racing system used in rodeos.
I have bought a garage wireless remote and reciever and wired the remote to the tapeswitch by utilising the on/off button. Whilst this woks perfectly when I trigger the tape by my foot or by hand, when I roll a skateboard over the tape the remote triggers for a fraction of a second, which isnt enough to fire the remote off completely or long enough.
What I need to create is a 1 second pulse, tirggered by the tape and I have tried making a 1 second timer using an LM555. This I then connected to a 4N25 optocoupler. Trouble is that the output side of the opto seems to not like acting as a 9v switch, and also the LM555 will switch on for a second but not re-set ready for the next skaters run....
What I need is a simple way of triggering the remote with a long enough simulated button press....whilst taking into account that the input pulse generated by the skater is tiny.
Any ideas? Thanks, Michael