Volt meter

[Transistorman]

hi all

im now in process on making volt meter ( not really accurate )

using PIC16F74 ,16x LEDs ,16x 180R resistor and 4 Mhz resonator

lets see

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im still waiting to my package come

i will post the video/picture on how it working

 

[Transistorman]

using this circuit

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heres the result

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8 leds on and 8 leds off

no comment ?

 

[be80be]

Looks good

 

[Transistorman]

Looks good

thanks

i will update it as soon as possible

 

[3v0]

Nice work.

 

[ericgibbs]

using this circuit

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heres the result



8 leds on and 8 leds off

no comment ?

hi TT,
The BAR mode for the LIT led's will consume a lot of power, why not use a DOT led mode.??

The lower LIT 7 leds are redundant

 

[Transistorman]

hi TT,
The BAR mode for the LIT led's will consume a lot of power, why not use a DOT led mode.??

The lower LIT 7 leds are redundant

i still dont have bar led on that time

youtube uploader are really slow

i will give you the video link later

next task : interface with GP2D12 distance sensor

 

[Transistorman]

here is the photo of it

using bargraph for better view

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[rajbex]

I am just done with mine, but it displays voltage on LCD.
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Here it is.
Make Your Own PIC12F683 Development Board: 0-20V Digital Voltmeter (DVM) using PIC12F683

 

[Transistorman]

I am just done with mine, but it displays voltage on LCD.
**broken link removed**
Here it is.
Make Your Own PIC12F683 Development Board: 0-20V Digital Voltmeter (DVM) using PIC12F683

hi

cool project

thanks for sharing

 

[3v0]

rajbex I would be curious to have you add a 1/100ths place to the display and check to see if the PIC and volt meter track together. I expect they may not agree but should keep the same difference between them.

 

[rajbex]

I will try tonight and post it here.

 

[rajbex]

Here are the results. The two meters give close values at lower voltages. The difference is big while measuring higher end voltages. My guess is
1. Resistors value changed because of getting heated at high voltage; that changes the input voltage,
2. Approximation errors are larger in magnitudes (not in %) at higher end of measurements.

 

[Transistorman]

Here are the results. The two meters give close values at lower voltages. The difference is big while measuring higher end voltages. My guess is
1. Resistors value changed because of getting heated at high voltage; that changes the input voltage,
2. Approximation errors are larger in magnitudes (not in %) at higher end of measurements.

hi

what is the worst thing can happen if its past 20V ?

 

[rajbex]

If it goes beyond 20V, the zener diode is there to clamp the ADC input to 5.1V.