wireless button project

Rich Grise wrote in news: snipped-for-privacy@example.net:

Rich,

These little RS ZIPZAP cars work very well. The receiver is tiney, and has two outputs in an H-bridge configuration for forward-reverse, and two open collector outputs for left-right steering. A little external logic gives you a lot of control options. Adding more wire for the receiver antenna really extends the range. I haven't done it, but you could reduce the transmitter size by cutting up the xmtr PCB and getting rid of the charger circuit.

I used one of these to remote control a gag gift for the departing President of our college.

Ken

Just wondering whether using a photo diode (or such) sitting behind a panel might be a simple way of avoiding the switch bounce problem. In this case your 'button presssing' would actual be placing your finger over a hole in the panel to change the light impinging on the photo diode/transistor.

Alternatively you could mock up a simple mechanical 'shutter' you press that controlled the light falling on the diode/transistor

Cheers

David

Pal> panfilero wrote:

Even photosensors have a tendency to produce more than one transition for each interruption. Unless designed not to, they can respond to the changing reflection from fingerprint skin variations as your finger is brought near the switching point. Similarly with a mechanical shutter, particularly if there are multiple ambient light sources and especially if they are ac-driven..

Such things are never quitre as easy as they first might appear..

I was just being flippant about the "delay" issue that the OP seemed too worried about.

- Tom