Multipel Keyfob RF Remote Controls

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fredrikandersson
 
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Multipel Keyfob RF Remote Controls

Post by fredrikandersson »

Hello,
I would like to use a Keyfob 2-Button RF Remote Control - 315MHz (PRODUCT ID: 1391) connected to a Simple RF M4 Receiver - 315MHz Momentary Type (PRODUCT ID: 1096) connected to a raspberry Pi Zero W.
I would like to use a maximum of 30 Keyfob 2-Button RF Remote Controls.
How do I address each remote so they get a different unique address? Is this possible?
I will display each remote on a monitor.
Kind Regards,
Fredrik

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adafruit_support_bill
 
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Re: Multipel Keyfob RF Remote Controls

Post by adafruit_support_bill »

It is possible to change the addresses of the keyfobs and the receivers. On the receiver, there is a row of unsoldered address pins. To change the address, solder one or more of those pins. On the fob, the process is similar. If you pry open the case, you will see some unconnected pins on the chip. Make sure that you solder the same pins on the fob as you do on the corresponding receiver.

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fredrikandersson
 
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Re: Multipel Keyfob RF Remote Controls

Post by fredrikandersson »

Hello,
Thanks for your reply.
How many unique addresses it is possible to create?
Kind Regards,
Fredrik

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adafruit_support_bill
 
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Re: Multipel Keyfob RF Remote Controls

Post by adafruit_support_bill »

There are 8 address pins, so you can create 2^8 = 255 unique addresses.

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BryonMiller
 
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Re: Multipel Keyfob RF Remote Controls

Post by BryonMiller »

Hello Bill,

This would be very handy for me also, particularly since the description of 1096 says.
One is that they do not have 'addressing' - if you have multiple receivers in a room, they'll all work at the same time with a single remote.
So I set out to find the unsoldered pins and I cannot identify any. Could you post a picture detailing where they are? I have not looked inside a fob but maybe a picture of that would also be handy.

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adafruit_support_bill
 
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Re: Multipel Keyfob RF Remote Controls

Post by adafruit_support_bill »

It looks like they have changed the design a bit. Older modes had the bottom row of pins unsoldered. The new ones are soldered, but not connected to anything. If you look at the 8 pins on the bottom right edge of the board, you will see a row of pads above and below the pins. To pull a pin HIGH, solder a bridge from the pin to the pad above it. To pull it LOW, solder a bridge to the bad below.

Image

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BryonMiller
 
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Re: Multipel Keyfob RF Remote Controls

Post by BryonMiller »

EXCELLENT! Thanks Bill.

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BryonMiller
 
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Re: Multipel Keyfob RF Remote Controls

Post by BryonMiller »

adafruit_support_bill wrote:There are 8 address pins, so you can create 2^8 = 255 unique addresses.
Mike, I did what I should have done before asking about this. I checked the device specs for the transmitters and receivers. As you noted there are 8 address pins. Each pin can be in one of three states - pulled low, pulled high or floating. Since these are tri-state inputs it seems to me there can be 3^8 = 6,561 unique address. Way cool!

Someone should really look into changing the descriptions for these products.

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mghia
 
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Re: Multipel Keyfob RF Remote Controls

Post by mghia »

Is the pull HIGH vs LOW the same issue as described for this tutorial https://learn.adafruit.com/audio-fx-rem ... rol/wiring
If the addresses were changed to "pull low" would that eliminate the need to use chip 74HC04?

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mghia
 
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Re: Multipel Keyfob RF Remote Controls

Post by mghia »

Is someone from adafruit available to answer my inquiry above? Thanks

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adafruit_support_bill
 
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Re: Multipel Keyfob RF Remote Controls

Post by adafruit_support_bill »

Module addressing is completely independent of the pin output. You will still need the inverter to interface with the Fx sound board.

As a rule - for prompt attention it is best to start a new thread with your question.

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mghia
 
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Re: Multipel Keyfob RF Remote Controls

Post by mghia »

OK Bill, Thanks
I just assumed you would want me not start a new topic on an existing topic. I assumed that posting would trigger a bump in the topic summary list and you would see it. Thanks I will now post a new topic if I dont get a response on future inquires.

SO while I have seen Hi and Lo in both, you are saying they are independent.

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