Comments on: Cell Phone Controlled Land Rover Using Logic Gates

By: Mehreen

Mehreen — Fri, 04 Apr 2014 10:06:00 +0000

hello! sir we cannot find MT88l70 in pcb could u pls tell us from where find it ??

By: Ziad

Ziad — Wed, 29 Jan 2014 08:25:00 +0000

Hello, hope you are doing fine. I was wondering if i can use L293B instead of L293D. Woud that make a major problem? One more thing, the jack for the input signal has three terminals. On which one should i connect?

By: Ligo George

Ligo George — Fri, 08 Nov 2013 02:46:00 +0000

In reply to Sonali Yadav. PINs of 74HC04 are arranged so.. to make the circuit diagram simple... in understanding and drawing..

By: Sonali Yadav

Sonali Yadav — Tue, 05 Nov 2013 10:26:00 +0000

Sir,isn’t the numbering in Ic74HC04 wrong? Shouldnt we start from the left hand side of the Ic?

By: Ligo George

Ligo George — Fri, 19 Apr 2013 15:00:00 +0000

In reply to Waqas Ahmed Ansari.

You can call from any phone… Put the mobile in rover in auto answer mode… Look at the first table… for keys to be pressed..

By: Waqas Ahmed Ansari

Waqas Ahmed Ansari — Wed, 17 Apr 2013 19:05:00 +0000

Hello Sir, I am sorry, but I didn’t understand that where the keys are to be pressed? In a mobile from which call is made, or in a mobile to which call is made? And also, if I haven’t an option to set on auto answer, Can I receive call immediately for operating rover?

By: Tirto

Tirto — Fri, 22 Mar 2013 10:21:00 +0000

In reply to Hassan Hadaddi. Most problems comes from connecting cellphone with DTMF circuit , people said that's caused by input impedance value wasn't appropriate.If still doesn't work You could also try connecting pin 5 & 6 on HT9170 to ground , replace 300K Ohms with 22K Ohms , and directly input to pin 3 with modifying the input circuit.

By: Tirto

Tirto — Tue, 19 Mar 2013 04:11:00 +0000

In reply to Hassan Hadaddi.

So , Cellphone – jack plugged -handsfree’s cable – mic – handsfree’s cable – open wire – DTMF circuit. The wires that open have two different colour , the copper means negative (Ring) and green means input (Tip) and don’t forget to set up your cellphone for auto answer.

By: Tirto

Tirto — Tue, 19 Mar 2013 03:58:00 +0000

In reply to Hassan Hadaddi. first , make sure you get a suitable handsfree for your cellphone. The handsfree always comes with mic , it attached on knob that used for stop conversation. Then cut only the earpiece , and you have two open wires. Remove enamel coating on those wire using matches then solder it to DTMF circuit. On the other side you just connect its jack plug into your cellphone.

By: Nicole Samehada

Nicole Samehada — Sat, 16 Mar 2013 00:50:00 +0000

In reply to Ligo George. What I mean is, how did you get the values for W,X,Y, and Z in the motor driver inputs