[Project] Voltage problem on Smoke device , need help

[zerostar]

Hi,
i am building a smoke device,

https://www.youtube.com/watch?v=F3q4GHofWfY

and getting some trouble on the voltage problem.


The device separate into 3 part, motor, heater, battery( 4 * 1.2V rechargeable battery) .
and 3 of them is connected in parallel .


Here is the problem :

1. motor do not receive enough to run (after test, it only got 1.9V . And heater got 1.5V )

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Hi,problem had been solved,
the main reason is wire problem, after changing wire, everything become alright.

By the way, another is multi meter reading problem,

When I switch to 200mA, it showed 11.0

When switching to 20mA, it showed 0.94,

I am confused on such number...

 

[alec_t]

I'm guessing the connecting wires are dropping too much voltage. Different lengths/thickness of wires will drop different amounts. What gauge wire are you using? How much current do the motor and heater draw?

 

[masster]

you've put a link to a video, but what is the schematics?
do you want us to guess just looking at the mess on the table?

 

[zerostar]

I'm guessing the connecting wires are dropping too much voltage. Different lengths/thickness of wires will drop different amounts. What gauge wire are you using? How much current do the motor and heater draw?

Opps, tell u later after checking.

 

[zerostar]

you've put a link to a video, but what is the schematics?
do you want us to guess just looking at the mess on the table?

Oh...sorry about this, i willmake a diagram later

But they just connect in parallel normally.

 

[zerostar]

I'm guessing the connecting wires are dropping too much voltage. Different lengths/thickness of wires will drop different amounts. What gauge wire are you using? How much current do the motor and heater draw?

wire : 1mm to 2mm
current (motor); 0.0019A
current (heater): 0.0017A

let me know if i do anythings wrong

 

[JimB]

current (motor); 0.0019A
current (heater): 0.0017A

let me know if i do anythings wrong

I suspect that there is something wrong with your meter or your measuring technique.

With a 4.8 volt supply, those currents represent far too little power for a motor or a heater.


JimB

 

[zerostar]

wire : 1mm to 2mm
current (motor); 0.0019A
current (heater): 0.0017A

let me know if i do anythings wrong

I got something wrong.

Battery output: 4.59V

Voltage (motor): 3.66V

Voltage (Heater): 2.95V

Current: 1.1MA

 

[zerostar]

But what is the reason of voltage drop,even connected in parallel ? Is it related to wire or the temperature?

 

[JimB]

Battery output: 4.59V

Voltage (motor): 3.66V

Voltage (Heater): 2.95V

Current: 1.1MA

This does not make any sense.
Can you post a picture of your set-up and how you are making the measurements?

JimB

 

[alec_t]

Have you set your meter correctly for measuring DC current and DC Volts, with the probes plugged into the correct sockets on the meter (DC Amps usually uses a different socket from DC Volts)?

 

[magvi]

posting your original schematic would be a great help

 

[zerostar]

Hi,problem had been solved,
the main reason is wire problem, after changing wire, everything become alright.

By the way, another is multi meter reading problem,

When I switch to 200mA, it showed 11.0

When switching to 20mA, it showed 0.94,

I am confused on such number...

 

[alec_t]

Your meter could be damaged if you tried measuring a current much greater than 20mA on the 20mA range

 

[zerostar]

Your meter could be damaged if you tried measuring a current much greater than 20mA on the 20mA range

When I switch to 200mA, it showed 11.0 ,is it mean 11mA?

 

[alec_t]

Yes, 11mA.

 

[zerostar]

Yes, 11mA.

But why switching to 20mA, it showed 0.94,, not 9.4?

 

[alec_t]

See post #14

 

[zerostar]

See post #14

Oh... i see ,thanks a lot!