0-10v dc

[naga]

Ok, fact #1 - I'm no genius...
fact #2 - good luck getting your code to compile and work in MeLabs PicBasicPro (any version)
And...that code you posted...why would it stop for you? There's nothing in there to make it stop!

Thank you very Much, actually i was trying that code in proton,by mistake i pasted.will delete now.
Since you are a senior member of this forum, and you also understood what code i am searching for, Could you pls help me out. i need to adjust the voltage 0-10 with 2 buttons..
Help would be appritiated..
Warm Regards..

[skimask]

Thank you very Much, actually i was trying that code in proton,by mistake i pasted.will delete now.
Since you are a senior member of this forum, and you also understood what code i am searching for, Could you pls help me out. i need to adjust the voltage 0-10 with 2 buttons..
Help would be appritiated..
Warm Regards..

Again...not a senior member of anything, and I don't use Proton.
That code you copied was close...so, change it to fit PBP.

[Ioannis]

OK, the 555 is good trick, but if you use an LMC66x series op-amp and a single +12 volt supply, you have a 0-10 voltage amplifier with 3 parts! May be 2 more to filter PWM from PIC...

Ioannis

[Melanie]

naga

If you use a PIC with Hardware PWM (eg 16F628) then varying the Duty in steps of 10% from 0 to 100% (see HPWM command) will give you your ten steps. A simple filter on the output will then give you ten voltage steps from 0v (0%) to 5v (100%).

I recall posting a circuit for an Op-Amp Voltage Doubler some time back. Do a forum SEARCH, stick that on the end of your filter and presto - you got ten steps of 0-10v.

[skimask]

I recall posting a circuit for an Op-Amp Voltage Doubler some time back. Do a forum SEARCH, stick that on the end of your filter and presto - you got ten steps of 0-10v.

http://www.picbasic.co.uk/forum/show...hlight=doubler

Is that it? I've got it on my 'hot' list of handy items to keep around...

[rmteo]

Or you could use one of these (without the need for a separate high voltage supply):
http://www.microchip.com/wwwproducts...cName=en010581

The TCM828/829 are CMOS "charge-pump" voltage converters in ultra-small 5-Pin SOT-23A packages. They invert and/or double an input voltage which can range from +1.5V to +5.5V. Conversion efficiency is typically >95%. Switching frequency is 12kHz for the TCM828 and 35kHz for the TCM829. External component requirement is only two capacitors (3.3µF nominal) for standard voltage inverter applications. With a few additional components a positive doubler can also be built. All other circuitry, including control, oscillator, power MOSFETs are integrated on-chip. Supply current is 50µA (TCM828) and 115µA (TCM829). The TCM828 and TCM829 are available in a 5-Pin SOT-23A surface mount package.

[naga]

naga

If you use a PIC with Hardware PWM (eg 16F628) then varying the Duty in steps of 10% from 0 to 100% (see HPWM command) will give you your ten steps. A simple filter on the output will then give you ten voltage steps from 0v (0%) to 5v (100%).

I recall posting a circuit for an Op-Amp Voltage Doubler some time back. Do a forum SEARCH, stick that on the end of your filter and presto - you got ten steps of 0-10v.

Hi, Could you please guide me If a 4MHz oscillator and 16f877a are used. want to control with UP and Down Buttons(10 steps)

Example: (Porta.0)

PWM PORTA.0,127,10 ?

Thank you.

[aratti]

Use Portc.1 or Portc.2 and HPWM (see page 73 of the manual)




B0 var Byte
Vduty var Byte

Vduty=0
B0=1

Main:

if UpButton =0 then
If Vduty<255 Then Vduty=Vduty+B0
Gosub HpwmSet
endif

if DownButton =0 then
If Vduty>0 then Vduty=Vduty+B0
Gosub HpwmSet
endif

goto Main


HpwmSet:
HPWM Channel, Vduty,Frequency
Return

with B0 = 1 you have 255 steps , if you want 10 steps set B0 = 25

UpButton and DownButton are two input ports with a 10K resistor pullup, the switch is normally open.

Al.

[aratti]

Sorry should be:
if DownButton =0 then
If Vduty>0 then Vduty=Vduty-B0
Gosub HpwmSet
endif