yesOk, so I was reading the documentation on the rfPIC12F675F and it seems like I would need 3 of those and then a flash kit to program it?
yesIf I'm understanding this right, the rfPIC12F675F is the basic transmitter which would send the signal out.
nope, PIC12F508 is just a simple uC that you can use with IR but to receive RF signal sent using rfPIC you need receiver .. for example this one:Where I'm getting confused is... arhi said use a "simple PIC12F508 with internal osc"
Is the PIC12F508 a receiver, or is it the same as the rfPIC12F675F? As well, what is an "OSC?"
To get the signal from one place to another, place two coils facing each other within 10 to 15 cm of one-another (See Figure 1)
Sound won't work through the 1/2" of resin. The minimal mass RF coupler is somewhat directional but will work through 1/2" of resin.
RF (AM or FM) antennas will be directional too, it's also going to be really tough to get a reliable 1' range in all directions. You'll need a good RF engineer to help with those problems. Do you need the range the same in all orientations?
to tune it up to detect 30cm distant device is IMHO pretty darn hard... you would have to make some pretty accurate antenna and I believe it's just too hard.
I still think it can be done with modulated IR. Each device can have 6 or more transmitting IR LED's (mounted around the object to cover all directions), the "shield" might diffuse the IR light but if it diffuses it evenly for all transmitters it might even be helpful.
the only possible way of using em is to go with minimal mass and find the way to increase the reach
What sort of batteries are you going to use? What sort of battery life are you hoping for?
Hmmm, really? I thought it was like a radio station, or a RC car controller where it just puts out a signal in all directions like those old 1940's TV ads. **broken link removed**
I figured apply the same thing...the factor that makes it 1 foot is that I'm limiting the initial range of the transmitter so much that beyond one foot it simply doesn't have the power.
The device will receive (and send) more powerfully in some directions than others, and that's very hard to get around. Also, what kind of obstacles must it deal with? i.e. does it have to detect the other device(s) through a wall? Around a hand?
What kind of cutoff do you need? I think it will also be very hard to make device which can accurately tell the difference between the level of a signal sent from 10" away and one sent from 14" away--especially when you start adding in directionality and possible environmental obstacles and interference.
What exactly is the problem you are trying to solve with these devices? Perhaps there is another (easier) way to go about it.
I'm not that good with RF but, tuning the output of the antenna to reach 30cm is what I was talking about ... to tune the circuit to transmit signal reachable at exactly 30cm (with let say 5cm error) is for me SciFi. To make it transmit 5m with 30cm error would be more likely. Now, there sure is a way, but I do not know it... There might be someone around who can design transmitter and receiver with that precision and I really hope someone will, as I would really like to look at the schematicThis could be my limited knowledge talking, but it seems like people think I am trying to send a radio signal out as far as I can, then have the devices detect when they're a foot away.
It is just an idea .. I play these days lot with IR so it came as possible solution. I have tried to send 40KHz signal trough single IR LED and detect it using IR Receiver (tuned to 40KHz) through few "obstacles"... I tried (i elcosed led in alu tube to narrow the beam so I eliminate bouncing effect and force beam trough obstacle)I'm not totally discounting your idea by any means, I'm just thinking that if IR is so dependent on light reaching the target in a consistent manner, it might be tricky.
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