Re-purpose that old IR beta max remote control
Ok, so inferred remotes were invented after that so it's not from a beta max VCR.
Anyway I have this remote that has a nice keyboard on it that was used to program one of those scrolling display things and I wanted to interface it to the propeller.
The first thing is to setup a 38khz demodulator circuit to decode what is coming from the remote. Second was to create some code that can capture the pulses that the remote was sending. This sounds simple but required some complicated code to get an accurate track of what the remote was sending.
Not only did I want to see the low pulse time but also the high pulse time so I could figure out how the keys were encoded. I also needed to know when it was sending data and when it was finished so I could decode the key sent.
So the following code reads the pulse data including how long the high and low pulses take just like an oscilloscope would. From there I can decode the key into highs and lows that could be use to build a binary representation of the key value.
So now you can use that old remote to control your propeller if you want.
Mike
Anyway I have this remote that has a nice keyboard on it that was used to program one of those scrolling display things and I wanted to interface it to the propeller.
The first thing is to setup a 38khz demodulator circuit to decode what is coming from the remote. Second was to create some code that can capture the pulses that the remote was sending. This sounds simple but required some complicated code to get an accurate track of what the remote was sending.
Not only did I want to see the low pulse time but also the high pulse time so I could figure out how the keys were encoded. I also needed to know when it was sending data and when it was finished so I could decode the key sent.
So the following code reads the pulse data including how long the high and low pulses take just like an oscilloscope would. From there I can decode the key into highs and lows that could be use to build a binary representation of the key value.
So now you can use that old remote to control your propeller if you want.
#include "simpletools.h"
#define PIN 20
int getInput(int);
void doValue(void);
int Data[100];
int n;
int i, j, k;
long tmo;
int main(void)
{
n = 0;
k = 1;
set_io_timeout(CLKFREQ/100); //set to 10ms
print("TimeOut:%d, Time:%d\n", st_timeout, st_iodt);
tmo = st_timeout/st_iodt;
input(PIN);
while (1)
{
i = getInput(k);
if (i > tmo) // we timed out
{
if (n > 0) // we have a sequence of pulses
{
doValue();
}
n = 0;
k = 0;
}
else
{
if (i > 1)
{
if (k == 1) // type of pulse and length
Data[n++] = -i;
else
Data[n++] = i;
}
}
k = 1 - k;
}
return 0;
}
int getInput(int x) // get pulse data
{
long i;
long j;
i = st_timeout;
j = CNT;
while ((x == get_state(PIN)) && (CNT - j < i));
return (CNT - j) / st_iodt;
}
void doValue(void) // output value
{
int i;
int j;
print("%d>", n);
for (i=0;i<n;i++)
print("%d,", Data[i]);
print("\n");
n = n - 1;
for (i=1;i<n;i++)
{
j = abs(Data[i]) - abs(Data[i+1]);
if (abs(j) > 150)
print("H");
else
print("L");
i++;
}
print("\n");
}
Mike
Comments
If any one needs a nice simple $2 universal remote with TONS of useful buttons (every button except one works when set up as a Sony TV remote), see my favorite at http://www.ebay.com/itm/Universal-Portable-Remote-Controller-Control-for-Television-TV-Set-TV-139F-SG-/281939674305
I buy 'em 4 at at time and use them in all sorts of projects.
And the fellow who listed now insists it was sold.
I agree. Based on spurious readings whilst making use of this remote,
"Infrared Keychain Remote" https://sparkfun.com/products/retired/10280 which they included in this kit,
"Sparkfun IR Control Kit" https://sparkfun.com/products/13235
And yes first talking to one of those dratted Ard**** things first. I then tracked down a remote from Target who did much the same thing and wouldn't annoy my HDTV when I had it on.
It was much more fun to figure out how to adapt the kit's contents to talk to a Basic Stamp, and when I discovered the one for the BOE Bot it was slightly easier.
---
Strange no robots here, they now live across from you erco.
Mike?
What about the header you included? Shouldn't that be disclosed also?
Never assume. In this context we can assume nothing. It might be that library you are thinking of. Then again it might be something he wrote to support the remote he was using.
Of course. I wrote that phrase, ah, that way, because I wasn't thrilled regarding how he responded.
I have copies here of it, both for windows and for the Raspberry Pi. I also have a PAB (Prop Activity Board) here, but I've not gone over what it can do, since those pixels came out last year.
---
That's strange, erco what is that robot doing in his den preparing to watch some difficult to understand sporting event on a wide flatscreen TV?
You failed to mention my robots in two posts here. Now don't rush, take your time and do things right.
No I didn't they were busy moving themselves across the street. Except for the one who went cross-country to watch some silly sporting event in a small town in CT, and in someone's home.