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Company Logo NXP Semiconductors

  • Mobile Controlled Land Rover

  • Created: Feb 09, 2014

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This circuit takes a further step in the world of remote controlled toy cars and recreational land rovers by incorporating the Dual-Tone Multi-Frequency (DTMF) signals for the control system. This innovation allows the use of mobile phones in controlling these motor machines and turns the mobile phones into wireless controllers suitable for the toy cars and recreational land rovers.This circuit allows the integration of the DTMF signals without the need of using a microcontroller but utilizing logic gates.

This circuit uses the HT9170 DTMF receiver which processes the signal from the mobile phone’s DTMF keypad. The HT9170 decodes the 16 DTMF tone pairs into a 4-bit BCD code output. The 74AHC04D, a high-speed Si-gate CMOS Hex Inverter, is used as a “not” gate for the circuit, the HEF4030BT Quad 2-input exclusive-OR gate is also used. The 74AHC04D and the HEF4030BT form the logic circuit between the decoder and the motor driver. The L293D is a quadruple half-H high-current drivers designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5V to 36V. It is designed to drive inductive loads such as relays, solenoids, dc and bipolar stepping motors, all inputs are transistor-transistor logic (TTL) compatible. The LM7805CT three-terminal one ampere positive voltage regulator supplies the circuit with 5V DC voltage.

This circuit will allow the user to control motor driven machines with the use of mobile phones. It will give the user the convenience of remote control access since this option is already incorporated in the mobile phone. This innovation is promising in the areas of surveillance, safety, recreation, and other applications using toy cars and land rovers.



"land rover?" Lower case or not, be careful.

Posted: Apr 02, 2014


Design looks good, you do need a capacitor on the output of the 5 v regulator such as 100 mfd, and a 10 mfd on the 12volt side to prevent noise spikes.

Posted: Apr 02, 2014


The design has been updated. Thank you for the suggestion.

Posted: Oct 08, 2014

Kristina Izarra


Posted: Oct 08, 2014



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