Clap ON/OFF s/w

Using Arduino General Electronics
1

Hello Everyone,

I need some help regarding driving the motor through Clap ON/OFF s/w. The circuit is attached to this.The o/p LED turns ON with 1st clap and turns OFF with the second. It works fine when I have LED as the o/p. But when I am trying to drive a motor it gets turned off before receiving the second sound.

It will be great if some one can help me with this issue.

Thanks in advance.

Clap-On-Clap-Off-Switch-Cir.gif
Clap-On-Clap-Off-Switch-Cir.gif1200×600 41.1 KB

2

That chip can't drive a motor directly (maybe a tiny tiny one) so you need to amplify that with a transistor. (Nor should you drive that led without resistor....) Also, add a diode across the motor (cathode to positive) as a flyback diode to protect the circuit from flyback voltages of the motor.

3

septillion:
That chip can't drive a motor directly (maybe a tiny tiny one) so you need to amplify that with a transistor. (Nor should you drive that led without resistor....) Also, add a diode across the motor (cathode to positive) as a flyback diode to protect the circuit from flyback voltages of the motor.

Thanks for the response.

I have connected a driver IC ULN2803 to drive the motor but still having the same problem.It drives but doesn't keeps it on to receive the second clap. I have connected the diode too.

4

What is "the motor"? How much current does it take? What power supply are you using to drive it?

Problems like this can be caused by trying to drive a motor or servo from a weak battery, like a typical rectangular 9V.

Steve

5

slipstick:
What is "the motor"? How much current does it take? What power supply are you using to drive it?

Problems like this can be caused by trying to drive a motor or servo from a weak battery, like a typical rectangular 9V.

Steve

Thank you for getting me back. The details are as follows:

Motor: Bo1 , 100 rpm DC geared 6v Motor,
Current : Maximum load current :200mA
Supply: using 5v regulated power supply(7805)through 9v battery

6

Aparna80E:
through 9v battery

There's your problem... 9V batteries are absolute terrible at providing current.

7

septillion:
There's your problem... 9V batteries are absolute terrible at providing current.

Now I tried using an 5v adapter.Having same issues.

8

Can you draw how you connected it all now?

9

septillion:
Can you draw how you connected it all now?

The circuit is attached. Thanks a lot.

cct motor.jpg

10

The right part is a bit fuzzy :confused:

Bit one thing I miss is decoupling capacitors. All IC's like to have a 100nF ceramic over the power pins as close as possible to the IC.

11

septillion:
The right part is a bit fuzzy :confused:

Bit one thing I miss is decoupling capacitors. All IC's like to have a 100nF ceramic over the power pins as close as possible to the IC.

Thanks for your help. Putting the decoupling Capacitor really worked.Thank you very much.

12

Aparna80E:
Thank you for getting me back. The details are as follows:

Motor: Bo1 , 100 rpm DC geared 6v Motor,
Current : Maximum load current :200mA
Supply: using 5v regulated power supply(7805)through 9v battery

200mA normal load suggests 1 to 2A stall current, I'd suggest a power source that can handle
that sort of peak current, such as a NiMH pack. Generally its a poor idea to share power
between motors and microcontrollers - the latter need clean dependable supply without
drop-outs or spikes, whereas motors are good and generating them.