Project idea
A DTMF phone-call–controlled mobile robot uses an MT8870 decoder to translate keypad tones into 8051 commands for forward, back, left, and right motion over virtually any cellular distance. An HC‑SR04 ultrasonic sensor halts motion on obstacle detection, while an onboard wireless camera streams live video to a PC for remote situational awareness.
 
Project description
An 8051 development board (with onboard 11.0592 MHz crystal, 7805 regulator, LED, and switches) interfaces to an MT8870 DTMF module for long‑range teleoperation via a simple phone call to the receiver handset. An HC‑SR04 manages obstacle stop logic, an L293D motor driver propels a 2‑wheel chassis, and an ESP32‑CAM provides wireless video streaming viewable on a PC, including low‑light support when paired with IR illumination.
 
Total list of components
8051 microcontroller development board
HC‑SR04 ultrasonic sensor
Robot chassis (2‑wheel kit with motors, wheels, hardware, battery box)
DC gear motors (included in 2‑wheel kit)
Motor driver IC (L293D module)
Crystal oscillator (onboard 11.0592 MHz on many 8051 boards)
Voltage regulator IC (onboard 7805 on many 8051 boards)
Resistors (pull‑ups and onboard passives on the 8051 board)
Capacitors (power and timing passives on the 8051 board)
Cables and connectors (screw terminals/header connectors on motor driver and chassis harness)
Diodes (general protection/components within typical dev ecosystems)
PCB and breadboards (8051 board PCB; optional solderless for prototyping)
LED (onboard power/user LEDs)
Push buttons (onboard user/interrupt buttons)
Switch (onboard power switch)
IC (AT89S52 class 8051 MCU)
IC sockets (onboard ZIF socket on many 8051 dev boards)
Wireless camera (ESP32‑CAM)
 
Features
Long‑range control via standard phone call DTMF decoding with MT8870.
Automatic obstacle halt using HC‑SR04 for non‑contact ranging up to 2–4 m.
Live wireless video streaming to PC using ESP32‑CAM.
Robust 8051 development board with onboard crystal, regulator, LEDs, and switches for reliable control.
Efficient DC motor drive using L293D H‑bridge module.
 
Applications
Remote monitoring and inspection with teleoperated mobility and live video feed.
Educational robotics and embedded control using 8051, DTMF decoding, sensing, and motor control.
Testbeds for long‑range telepresence and obstacle‑aware navigation.
 
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 Soldered - We are providing fully assembled, tested and ready-made project soldered on a PCB with all the other components, code & circuit diagram.
 
Dimensions (cm)
Assembled robot: approximately 18 × 12 × 10 cm, aligned to common 2‑wheel acrylic chassis footprints.
 
Shipping dimensions (cm)
Packed kit: approximately 25 × 20 × 12 cm to accommodate chassis plates, wheels, boards, and protection.
 
Weight
Approximate assembled weight: ~0.9 kg, driven largely by battery mass and chassis hardware.
 
Estimate project weight
Typical range: ~0.9–1.2 kg depending on battery capacity and camera mounting.
 
Notes: All the products are made by LearnElectronics India and not for re-sale.