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Hello everyone;
I am erdoğan, I am writing you from TURKEY.
I have project for remote control. I want to use ht 6026 (holtek) transmitter in side to remote control.
By the way, I want to use pic16f628a for receiver side. But I dont know anything related to ht 6026.
I read datasheet. they told very easy. but I dont have any example code for PBP.
I think you used this IC before. Pls help me for this.
Thank you for your interest.
Hi,
If you've done anything with PBP previously then you should be able to get this going. As far as example code it would only be a couple of lines long.
Basically set AD0 to AD8 pins to the data you want to send (either high, low or floating) and then pull the TE pin low to start sending, pull TE pin high to stop. That's it as far as I can see.
Write something, try it out, if you need help come back and post the code and I'm sure someone will be able to help.
/Henrik.
Hello Henrik;
Thank you for your quickly answer.
I can use pbp, and I have already software for different project.
But I will use holtek first time and I dont know what can I do?
For example ;
İf I have transmitter with mcu; I will write code.
hSerIn 5,atla, [WAIT("ERD"),AL,AL1.lowbyte,al1.highbyte]
if al=01 then
portb.1=1
while al=01:wend
portb.1=0
endıf
I mean , How can I catch ht 6026 code. How can I translete it and use it.
thank you.
Hi,
Ahh, OK you want to write code for the receiver. I'm sorry I misunderstood the question there.
I think you would need a matching decoder chip, however looking at the HOLTEK website there doesn't seem to exist such a thing - like there is with the HT12 series for example.
If you're trying to receive data without a corresponding decoder chip then you're going to have to look at the timing diagram at page 4 in the datasheet and then try to write code that syncs the receiver with the pilot period of the transmision and then deciphers the data according to the timings for "0", "1" and "open". I don't think SERIN will do it. Hopefully someone else has more hands on experience with these than I have and could lend you hand.
Again, sorry for missunderstanding the original question!
/Henrik.
Hi ,
İt isn't problem for me. You are trying to help for me. Maybe I couldn't tell it.
Anyway I will look datasheet for code again, I can find on the google same code for PBP.
I seen code like to this, but it is ASM. I dont know ASM more.
İf I have any solve, I will write in here.
Thank you again.
The HT6026 uses three states for the data encoder. This makes the decoding much more difficult using PIC instead of a dedicated chip.
To decode this in software, I think it is necessary to use interrupts on PortB.0 and also in cooperation with the flag 6 in Option_Reg to detect the edge of the incoming pulse.
Then with the timers of the PIC you can measure the width of every pulse by starting and stoping the timer for every pulse that triggers the interrupt pin on PortB.0
As you can understand it is not at all an easy task.
It would be necessary to use a second timer also to have a timeout, if the incoming series of pulse is noise and dump the collected data so far. Every data packet is 72 clock long. For 20KHz clock this is 3,6 ms. So if the data packet (AD0-AD8) is longer than say 4ms, software should consider it as noise.
Now that I check each pulse, it seems that for 20KHz clock, each pulse is 50usec width. For a PIC like 628 at say 4 or even 8MHz this is too fast.
It may not be possible to decode in basic and assembly might be the way to go.
Ioannis