Why Does The Website Say Device Offline?

The website and D1 Mini must use the same MQTT topic branch.

Why Does RF Capture Time Out?

Also verify the 5 V receiver supply, resistor-divider orientation, common GND, and antenna connection.

Can I Power Every Module From 3.3 V?

The OLED and IR receiver use 3.3 V in this build. The common 433 MHz receiver, RF transmitter, and IR transmitter use regulated 5 V for better operation. Their signal wires still connect to 3.3 V ESP8266 pins. The 5 V RF receiver output therefore needs the resistor divider.

Are The Capacitors Shorting 5 V To GND?

No. They are supposed to connect across the power rails.

Can I Charge The Battery Inside The Device?

Not with this simplified external-charger design.

Can I Use 5 Ω And 10 Ω Resistors For The RF Divider?

Five-ohm and ten-ohm resistors would draw unnecessary current and are not suitable substitutes.

Flipper Zero On A Budget: Build Your Own IR And 433 MHz RF Wi-Fi Remote

Sanzhi Kobzhan

2 days ago

17 min read

Flipper Zero is popular because it places several wireless tools inside one portable device. This project follows the same experimental idea on a smaller budget: a D1 Mini captures one infrared command and one compatible fixed-code 433 MHz RF command, saves them in memory, and replays them from a private web dashboard.

It is not a full Flipper Zero replacement, but it is a practical way to learn IR, RF, MQTT, embedded storage, and secure web control in one build.

Use this device only with equipment you own or have explicit permission to test. The RF section is intended for simple fixed-code ASK/OOK remotes. It does not decode or bypass rolling-code access systems.

This article includes a step-by-step device assembly guide, wiring schema, D1 mini and website code, hiveMQ instructions.

Key Takeaways

The D1 Mini stores one IR signal and one compatible 433 MHz fixed-code RF signal after power is removed.
A secure server-side relay keeps HiveMQ credentials out of the browser and public website code.
The finished power system uses a removable 18650 battery, two-pin switch, and regulated 5 V boost converter.
The guide includes exact wiring, voltage-divider values, code, testing checkpoints, and solutions to common power problems.

What We Are Building

The device has four jobs:

Connect to Wi-Fi and HiveMQ Cloud.
Capture an IR or compatible 433 MHz RF signal when the website requests it.
Save the captured signal in the ESP8266 EEPROM area.
Replay the saved signal when you press a button on the private dashboard.

Flipper zero on a budget. what we are building.

An OLED shows whether Wi-Fi and MQTT are connected and whether an IR or RF signal is stored.

The website never connects directly to HiveMQ. Its server-side API reads the credentials from protected environment variables and sends only approved commands.

Parts You Need

Part	Quantity	Purpose
Wemos D1 Mini ESP8266	1	Main controller, Wi-Fi, and EEPROM storage
1.3-inch I2C OLED, usually SH1106	1	Connection and capture status
IR receiver module & IR transmitter module	1	Captures remote-control signals & Replays stored IR signals
433 MHz ASK/OOK receiver & 433 MHz ASK/OOK transmitter	1	Captures compatible fixed-code RF signals & Replays compatible RF signals
5 kΩ resistor marked 5K or 502	1	Upper part of RF data voltage divider
10 kΩ resistor marked 10K or 103	1	Lower part of RF data voltage divider
220 µF electrolytic capacitor, at least 10 V	1	Reduces power dips during transmission