What is it?

I designed this circuit originally for using with a Raspberry Pi to allow a remote control to power the system on and off while offering some remote control GPIO inputs. It has since evolved into a general purpose RF remote controlled DC power source. The remote v1.0 works with most single board computers, vintage game consoles, and many other applications as well.

With 4 buttons on the keychain remote control FOB, momentarily pressing "A" (or on-board button) will switch on a relay which turns on a 2.25A switching voltage regulator for powering up your project or system. When "A" is held for 3 seconds, the relay and regulator are powered down. This circuit provides 2 switched voltage outputs: regulated (5.5v, 3.3v, or 1.8v) and unregulated (input voltage.) Buttons "B" "C" and "D" have non-latching, active low, open drain outputs for wiring up additional remote controlled functions. To power the receiver circuit at all times, the Remote v1.0 incorporates a secondary 5v regulator with only 6.5mA total current draw while off.

Why did you make it?

I wanted an easy way to add remote control functions to various projects I'm working on.

Can be installed in most classic video game consoles to add remote controlled power and reset functions.

Can power the Raspberry Pi or similar micro computer while the B, C, and D button outputs can be connected to GPIO pins (with 10k pull-up resistors to 3.3v)

Features:

Texas Instruments PTH08080WAH regulator module is 93% efficient. Over current protection, thermal overload protection, reverse polarity protection, and under voltage lockout.

Heavy duty relay with 5A rated contacts.

Has a jumper with that can be set to automatically switch on when powered up, or enter "standby" mode when power is first applied (default.)

5.5 x 2.1mm power input jack, power on/off button, and power / standby LED indicators on a removable PCB extension. This portion can be cut off for minimum size and/or use of external components.

Assembled Receiver PCB Measurements: 2-11/16" x 1-3/4" x 9/16"

What's included?

• Assembled Remote v1.0 PCB

• Keychain Remote Control w/ 4 Buttons

• RF Receiver board

• Various components for customization options and single board computer connection

Specifications

• Input voltage: 6.5 - 16.0 VDC (2.5A input supply recommended for rated output)

• Switching voltage regulator output: 5.0, 3.3, or 1.8 volts @ 2.25A

• Standby mode current draw: 6.5mA (without indicator LED)

• Remote Range: Approximately 100ft. (no obstructions)

• Frequency: 315MHz (~250-450MHz)

• 3 Remote Button Outputs: Non-latching, open drain, active-low

• Power Input Jack: 5.5mm x 2.1mm center positive

• Transmitter has a 65mm telescoping antenna

• Receiver requires a 9 inch long wire for the antenna

• Transmitter FOB is powered by an included 12V camera battery

Setting regulator DC output voltage:

3 different value resistors are included to set the regulated DC voltage output.

5v = 348 ohm

3.3v = 1.87k ohm

1.8v = 8.06k ohm

0.9v = no resistor installed

Address code is set using jumpers on both transmitter & the receiver board. Received signal causes "Valid ID" output on the receiver board and the corresponding data pin (B,C,or D) to go low. Output pins float when no remote button is pressed. Pull-up resistors may be required depending on application.

NOTE: Factory default is both FOB & Receiver Address Bits are Floating (F), So all receivers will respond to all FOBs. To set unique addresses, you jumper BOTH FOB & Receiver address pins with the SAME “1”, “0” & “F” combinations.