Project idea
Build a wireless controller that decodes TV‑remote RC5/38 kHz IR commands via TSOP1738 to an 8051 microcontroller, which then toggles two DPDT relays (via ULN2003) to reverse a single‑phase induction motor safely.
The system focuses on direction control for applications like exhaust fans by swapping the appropriate motor leads with an interlocked relay scheme to achieve clockwise and anticlockwise rotation.
 
Project description
An IR receiver module (TSOP1738) captures RC5‑style commands from a standard TV remote and feeds them to an AT89S52‑class 8051 running Embedded C, which drives a ULN2003 to energize 12 V DPDT relays for forward/reverse selection.
Power is supplied by a 12 V/1 A SMPS adapter for the relay coils and a regulated 5 V rail for logic, with the 8051 clocked at 11.0592 MHz for stable serial timing and robust IR decode timing.
 
Total list of components
AT89S52 (8051) microcontroller IC – 1 pc.
Universal TV remote (IR, 38 kHz compatible) – 1 pc.
TSOP1738 IR receiver (38 kHz) – 1 pc.
ULN2003 Darlington driver IC – 1 pc.
12 V DC DPDT relay (≥2 A contacts) – 2 pcs.
12 V/1 A SMPS adapter – 1 pc.
11.0592 MHz crystal (through‑hole or SMD) – 1 pc.
Solderless breadboard (MB102, 830 tie‑points) – 1 pc.
1N4007 rectifier diodes (for protection/filtering) – 5 pcs.
Single‑phase shaded‑pole/squirrel‑cage induction motor (demo‑scale) – 1 pc.
Jumpers, LEDs, push button, on/off switch, 40‑pin IC socket, basic passives (resistors/capacitors) – assorted.
 
Features
IR remote control using 38 kHz receiver compatible with common TV remotes for easy wireless input.
Safe forward/reverse motor control via two DPDT relays driven by ULN2003 with flyback protection.
8051‑based firmware with stable 11.0592 MHz timing for reliable RC5 decode and debounced command handling.
 
Applications
Exhaust fans requiring reversible airflow for specialized ventilation or testing setups.
Small conveyor, demo rigs, and lab training benches needing reversible AC motor direction.
 
Project Includes:
Fully assembled and tested circuit
Circuit diagram
Source code 
(For DIY KITs - only the components will be provided)
 
Project Types:
DIY KIT(Do IT YourSelf KIT) - We are providing only components in this kit for this project
DIY KIT with Code & Circuit Connections - Along with the components, you will get the Code and the Circuit Connections file to help you build the project easily.
Readymade Breadboard - We are providing fully assembled, tested and ready-made project using plug-n-play jumper wires and breadboard with all the other components, code & circuit diagram.
Readymade Soldered - We are providing fully assembled, tested and ready-made project soldered on a PCB with all the other components, code & circuit diagram.
 
Dimensions in cm
Controller electronics (on MB102 + small relay carrier): approximately 12 × 10 × 5 cm, guided by a 10.5 × 9.2 cm class 8051 board footprint and relay clearances.
Front‑panel (switch/LED) clearance can be contained within the same envelope for compact bench use.
 
Shipping dimensions in cm
Packed kit (controller + adapter + small AC motor): approximately 25 × 20 × 10 cm for safe relay and motor cushioning.
Using a single carton reduces parts damage risk and simplifies logistics for educational kit shipments.
 
Weight
Typical small shaded‑pole/synchronous demo motors weigh around 0.6–0.8 kg, with electronics under 0.5 kg.
The power adapter adds marginal mass (<0.2 kg), keeping total easily under common courier slab limits.
 
Estimate project weight
Total packed weight ≈ 2 kg (motor ~0.7 kg + controller/adapter/cables ~0.6 kg) for a representative demo‑scale kit.
 
Notes: All the products are made by LearnElectronics India and not for re-sale.