The data sheet for each of the chips has a chart for finding the value.
The encoder datasheet shows 3kHz as the typical freq, so use the chart to find the resistor value depending on your supply voltage. Then, they tell you that the decoder clock freq should be some multiple of the encoder clock freq, I'll leave it to you to look it up, then you just use the chart in the decoder datasheet to find the resistor value.
I have checked data sheet of it shows, IR led as i ask for photo diode the shopkeeper gives me this.
can i use 3 pin TSOP receiver which is mostly used in TV & STB receivers.
All I see from you are questions. Why not design a circuit and a program to interact with it and ask when you have problems. The answer to most of your questions so far are "READ THE DATASHEET"
You tell us what kind of photodiode should be used for the HT12D. What sort of wavelengths are needed? What kind of voltage and current does the HT12D require? Are there any photodiodes capable of providing that? If not, what kind of circuit would you need between the photodiode and the HT12D? Use the Wikipedia and other internet DIY (Do It Yourself) sources for information.
Parallax's "IR Remote for the BoeBot Robot" tutorial discusses how IR emitters and detectors work and how to use them with a Stamp. Even if you don't plan to use a microcontroller, the information is relevant. Go to the main Parallax webpage and click on the Downloads button. On the Downloads webpage, click on Educational Tutorials and Translations to find this tutorial.
Ok, after my exam i.e. now my summer vacation are started...
I want to use holtek 12E/D i have got photo diode & IR led, i have seen data sheet of HT...., i want to know how to connect the LED & phto diode, mean with respect to Vcc or Gnd.... & please tell me how to use it i am confused with it...
i want to know how to connect the LED & phto diode, mean with respect to Vcc or Gnd
You would do this just like the datasheet tells you to. Please try to do these things yourself and if you run into specific problems with Parallax products or software feel free to ask.
Could you link to the datasheets where it is not mentioned? It seems strange that if they do not connect in a standard way (Google) that the datasheet would not mention the correct way.
Could you link to the datasheets where it is not mentioned? It seems strange that if they do not connect in a standard way (Google) that the datasheet would not mention the correct way.
They have mention only circuit for RF TX & Rx..........not for IR link
The IR LED will put out a continuous IR signal when it's turned on and the IR Photodiode will produce a signal when it sees an IR signal, but this sort of "continuous wave" signalling is very unreliable, particularly outdoors, but is bad even in standard room lighting. Normally the IR LED signal is modulated, usually around 38KHz, and a modulated IR detector is used to receive it, not a plain photodiode. The "IR Remote for the BoeBot Robot" tutorial goes into detail on how to use one of these IR detectors. Parallax sells them and they're available through many other dealers. There's also a circuit given in the back of the tutorial on how to generate a 38KHz signal using a 555 timer and an IR LED. This circuit can be triggered by a Stamp or by a Holtek encoder. The IR detector can also be attached to a Stamp or to a Holtek decoder. Have a look at the tutorial.
Ahh using logic gates like flip flops and OR gates. Why cant you design a wireless circuit that transmits an 16 bit pulse to a receiver that decodes this and kills the engine.
Comments
I am interested about Your item: Holtek 121E/D ic for wireless, could You please tell Me more?
A data sheet link maybe?
thank you for your time in this.
i asked this 12 E/D in market the shopkeeper in India was saying there are 3 IC cost 100/.RS each, name something like HT12E/D/F.
The data sheet for each of the chips has a chart for finding the value.
The encoder datasheet shows 3kHz as the typical freq, so use the chart to find the resistor value depending on your supply voltage. Then, they tell you that the decoder clock freq should be some multiple of the encoder clock freq, I'll leave it to you to look it up, then you just use the chart in the decoder datasheet to find the resistor value.
C.W.
can i use 3 pin TSOP receiver which is mostly used in TV & STB receivers.
where i don't find it.
Parallax's "IR Remote for the BoeBot Robot" tutorial discusses how IR emitters and detectors work and how to use them with a Stamp. Even if you don't plan to use a microcontroller, the information is relevant. Go to the main Parallax webpage and click on the Downloads button. On the Downloads webpage, click on Educational Tutorials and Translations to find this tutorial.
I want to use holtek 12E/D i have got photo diode & IR led, i have seen data sheet of HT...., i want to know how to connect the LED & phto diode, mean with respect to Vcc or Gnd.... & please tell me how to use it i am confused with it...
Thanks
It is not mention there..
They have mention only circuit for RF TX & Rx..........not for IR link
http://www.robodacta.com.mx/UserFiles/PDFs/HT-12E.pdf
http://www.jameco.com/Jameco/Products/ProdDS/123748.pdf
Ahh using logic gates like flip flops and OR gates. Why cant you design a wireless circuit that transmits an 16 bit pulse to a receiver that decodes this and kills the engine.