Vibrator motor...
Vibrator motor...
(OP)
Hi all,
I have created a little RF transmitter/receiver module (with encoder/decoder). The decoder is the following and of hi quality (R-8PD 4-Bit Decoder IC, ht tp://www.r entron.com /remote_co ntrol/Holt ek.htm#R8P)
Now, the DataOut of the decoder has +3v when signal is sent by the transmitter. This is ok but if I connect a LED to the DataOut&GND then the LED turns on (good news) BUT when I connect a vibrator motor (http://ww w.selmag.c om.tw/en/p /39-vibrat or_coin_ty pe_33.html), the vibrator doesn't activate (bad news).
Since I need to activate this vibrator motor my questions are:
1) Why although the voltage is OK, the vibrator motor isn't acivated?
2) Is it a matter of some extra circuit? What should this circuit consist of and how may I construct it? Any schematic would help so much.
Regards,
Alexis Yannopoulos
Mech. Engineer NTUA, MSc
I have created a little RF transmitter/receiver module (with encoder/decoder). The decoder is the following and of hi quality (R-8PD 4-Bit Decoder IC, ht
Now, the DataOut of the decoder has +3v when signal is sent by the transmitter. This is ok but if I connect a LED to the DataOut&GND then the LED turns on (good news) BUT when I connect a vibrator motor (http://ww
Since I need to activate this vibrator motor my questions are:
1) Why although the voltage is OK, the vibrator motor isn't acivated?
2) Is it a matter of some extra circuit? What should this circuit consist of and how may I construct it? Any schematic would help so much.
Regards,
Alexis Yannopoulos
Mech. Engineer NTUA, MSc





RE: Vibrator motor...
RE: Vibrator motor...
RE: Vibrator motor...
A Darlington will likely be too much voltage drop to work. You just need a single MOSFET of BJT transisitor that can handle 200mA.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Vibrator motor...
RE: Vibrator motor...
So a simple MOFSET transistor is all that is needed? Or I need more items to do the job?
For example the MOFSET linked below would be enough for my needs?
http://cg
Regards,
Alexis Yannopoulos
Mech. Engineer NTUA, MSc
RE: Vibrator motor...
Regards,
Alexis Yannopoulos
Mech. Engineer NTUA, MSc
RE: Vibrator motor...
I a so confused now.
Rgds and thanks in advnace
RE: Vibrator motor...
Do you know whether the vibrator current will cause any noise problems for the remainder of your circuitry?
Do you even have enough power to run the vibrator?
Have you sized the battery sufficiently to not have to change batteries every hour, or whatever?
TTFN
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RE: Vibrator motor...
RE: Vibrator motor...
That is the very circuit I'm suggesting.
If you want to use that FET as the transistor you can. Don't bother with the 2.2k resistor if you use the FET. Or use the 2222 and include it. If you use the FET the 'source' is grounded and the 'gate' is the control.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Vibrator motor...
So I connected all of them to the vibrator and worked.
Thanks a zillion again
Alexis
RE: Vibrator motor...
You should proceed with the transistor. Your setup will possibly soon fail.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Vibrator motor...
RE: Vibrator motor...
RE: Vibrator motor...
aware; That so-called decoder chip is just a PIC microcontroller programmed to provide that functionality. Holtek's spec just parrots the PIC's normal data sheet. The 200mA is what you could drive out of 8 pins as you are to limit the current out of any single pin to NO MORE THAN 25mA. Their warning is that if you somehow had a whole bunch of pins sourcing 25mA each you would exceed and possibly burn out the supply pin bond wire to the entire chip.
You need 120mA to run your vibrator. That equates to 120mA/25mA = 5 pins. Are you using five pins that all turn ON at the same time? If you are not, you are badly stressing the chip. It will fail. S o o n.
Hook it up like they tell you to and you won't have any failures and flaky behavior.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Vibrator motor...
RE: Vibrator motor...
RE: Vibrator motor...
RE: Vibrator motor...
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Vibrator motor...
However, I face an issue: whenever the signal is sent, there is a time delay of approx. one third of a second until the vibrator is activated.
Is there a way to minimise or eliminate this delay please?
RE: Vibrator motor...
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Vibrator motor...
Keith Cress
kcress - http://www.flaminsystems.com
RE: Vibrator motor...