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The Key Fob Remote is a simple device that lets
you control four outputs on the included Receiver
PCB. Just press a button on the Remote to make
the corresponding output pins on the Receiver PCB
send a 5 V high signal. It’s an affordable way to
add wireless human input to your projects.
Key Fob Remote (#700-10016)
Features
4 channel control
Signal indicator LED
Remote and Receiver PCB are pre-
synchronized
Up to 50 foot line-of sight range
Source 40 mA per Receiver channel @ 5 VDC for your projects
Pre-installed battery in the remote
Key Specifications
Operating frequency: 316 MHz band
Standard 0.1" pin spacing
Range: Up to 50 feet (15.25 meters) line-of-sight
Power requirements: 5.0 VDC; 40 mA @ 5 VDC per receiver channel
Communication: TTL level
Receiver PCB Dimensions: 1.34 x 0.96 in (3.40 x 2.44 cm)
Operating temp range: -4 to +158 °F (-20 to +70 °C )
Application Ideas
Remote lighting activator
Keyless access
Remote digital sign controller
Copyright © Parallax Inc.
Key Fob Remote (#700-10016)
v1.2 12/20/2017 Page 1 of 3
Connection Diagram
The representation below shows a typical interface to the Key Fob Receiver Board. Resistors indicate your
added devices (e.g. microcontroller I/O pin, relay, etc…).
Receiver Board
The receiver board only needs 5 VDC on the VCC pin. Once it is powered up, you are ready to connect
“VT” or any of the “D” pins to your project.
Antenna
RF receive
indicator LED
Pairing
button
PINS: VCC, GND, VT, D4, D3, D2, D1, GND
The Receiver Board has a pre-soldered antenna in “ANT2”. To add even more range to the receiver you
can add your own antenna to “ANT1” on the receiver board.
Copyright © Parallax Inc.
Key Fob Remote (#700-10016)
v1.2 12/20/2017 Page 2 of 3
Key Chain Remote
The Key Chain Remote has four buttons. The large buttons are labeled A and B; the smaller buttons are
labeled C and D. The table below shows which pins on the Receiver Board that become active “high”
(5 VDC @ 40 mA) when its corresponding button is pressed. When a button is released, its pin goes back
to a “low” state.
Transmit LED
Key Chain Button
“A”
“B”
“C”
“D”
Receiver Board Pins
VT & D1
VT & D2
VT & D3
VT & D4
Adding Additional Remotes
The Remote and Receiver PCB are pre-synchronized. You can synchronize the PCB with additional
keychain remotes by pressing and holding down the PCB’s “pairing button” while pressing any of the
buttons on the Remote want to add.
Changing the Remote’s Battery
The remote uses one size 27 A, 12 V alkaline battery. The remote comes with the battery pre-installed,
and it may be replaced if needed. To access the battery compartment, remove the three tiny Phillips-
head screws on the back of the remote, and remove the back cover.
Revision History
Version 1.1:
Documentation updated to correct for range.
Version 1.2: corrected operating frequency from 433 to 316 MHz band.
Copyright © Parallax Inc.
Key Fob Remote (#700-10016)
v1.2 12/20/2017 Page 3 of 3
