You would have to switch the throttle signal wire, because switching off the 5v supply would cause the throttle failure mode to cut in, allowing half power from the cruise button while stationary.
Hey true... Could we do a 10K (or 12) always connected to throttle to allow minimal signal, and have this circuit bypass it?
I guess its same-same but different!
You could still switch to bypass both ways so thats good.
Your circuit is perfect, but I don't think you need the relay there. I was thinking you would just have the 555 timer output go directly to the throttle power feed. This would bypass the 10K resistor for minimal throttle signal.
Pedicab sent in a PM - he wants to only have the pedelec activate the throttle, for as long as the battery lasts. So the only way to "switch off" (disable) the throttle is to reset power. He wants the rider to only take off pedalling. Thats pretty much the gist
You can make the trigger last heaps longer than 10 minutes but I never timed it, I'll have to knock something up in the next few days I've got some 555's around I can get something sorted.
Would you use a reed switch and magnets (like cycle computers) or simply tap in to the output from one of the hall sensors?
I don't have pedelec connected on my rides, but does it just pull 5v+ to gnd? If so, that would still be able to use as the trigger.
Each time the trigger is enabled, it will switch the output for the given discharge time. If you keep triggering the timer ie: pedalling there is no 'buffer' it will only re-trigger once the timer has finished and it will self reset. But if the tigger is held in, ie: pedalling constantly it will continue to enable the throttle
If the wheel was stopped, with the magnet next to the reed switch/hall sensor, would the continuous signal allow the throttle to work?
If so, it might need to be a coil and magnets, rather than a magnetic switch, so that signal pulses would only be generated while the wheel was actually moving.
Hmmm I think I'd answer this better if I knew what the GM pedelec output was... Let me know, but I was pretty sure it pulled 5v+ to gnd, but let me know?
Also - read the notes about 'edge triggering' in the web link
If you use that amendment, then the throttle will not be enable unless there is a change in the signal ie: pedalling
And that's a good point, because if it was using the circuit as you posted - when the pedal was in the GND state, it would automatically trigger the timer. Haha imagine testing that one without the wheels off the ground :O
Does this circuit look OK to you Monkey?
Yes perfect, but you would slip a 1K or higher in series with the pot (VR1) probably 10K even depending on the time you need for the pulse trigger output. What timing were you thinking? I'll hunt for some 555's tomorrow.
Would need to test it in case having the trigger on, from the pedal location (or wheel if using a wheel sensor) auto enables that output. I'd have to test that edge-triggering to made sure if the pedal location would auto-trigger, hopefully the trigger will float until the signal changes ie: pedalling.....
The shortest I've ever made it trigger was about 40ms, and that was with fixed values. I think we might have been thinking about 2 different things? - I was thinking of a circuit to enable the throttle a given period based on the pedelec sensor
But I like your thinking, that way you could adjust the power of pedelec and the duration. You would just have to remember to switch your power on the bike or not move the pedals until you are properly seated
but we could do a delay timer for that lol
