No current regulator.
What he means is say one 7805 will run the PIC (7805 at best 1 amp) = low current.
Power supply for motors are made from parallel 7805s or some other type to handle the amperage needed.
|
No current regulator.
What he means is say one 7805 will run the PIC (7805 at best 1 amp) = low current.
Power supply for motors are made from parallel 7805s or some other type to handle the amperage needed.
Dave
Always wear safety glasses while programming.
|
thanks a lot i am gonna try it...Originally Posted by mackrackit
hi Acetronics ,
I am sure i changed code like that
motor:
for i=0 to 25
PAUSEUS 20000-(T*10)
PULSOUT PORTC.2,T
next
return
|
God bless you guys!
1-I connected 9v 450ma(I hope 450ma is fine) power supply and connected two 7805 paralel and used a 470uf between vdd and vss.Mcu doesnt reset itself and works fine! But I think servo works a little bit slower than past.I dont know why? maybe changing power supply from 5.2 to 5 makes this difference...If its neccessary I can put here its video...
2-I think I finished left-right position and wrote a new code to complete my project.I wrote this
but That doesnt work and servo2(up-down) made some stupid moves (like vibration).Also left-right motion gets very very slower...I know I made too many mistakes.But I learned here this forum too many things that I dont know.Everybody wants to help here and I was a little suprised at the beginning of this Thread.I put my code here.
Can you help me again? t for left-right j for up-down.I bounded "j" between 135 and 115
My code is....
Code:DEFINE LCD_DREG PORTB DEFINE LCD_DBIT 0 DEFINE LCD_RSREG PORTB DEFINE LCD_RSBIT 4 DEFINE LCD_EREG PORTB DEFINE LCD_EBIT 5 DEFINE LCD_BITS 4 DEFINE LCD_LINES 2 DEFINE OSC 4 DEFINE ADC_BITS 8 'A/D çevirim sonucu kaç bit olacak DEFINE ADC_CLOCK 3 'Clock kaynağı (3=rc) DEFINE ADC_SAMPLEUS 100 SYMBOL F=PORTA.0 SYMBOL G=PORTA.1 alta var byte usta var byte altb var byte ustb var byte sola var byte solb var byte saga var byte sagb var byte k var byte t var byte i var byte j var byte ADCON1=2 TRISA=%00001111 TRISB=0 PORTB=0 TRISC=0 LCDOUT $FE,1 pause 2000 adcin 0,ALTa ADCin 1,usta adcin 2,sola adcin 3,saga T=150 j=125 yap: adcin 0,altb ADCin 1,ustb adcin 2,solb adcin 3,sagb if ((((usta+10)*100)/(ustb+10)))>130 and (not (t>194)) then T=T+15 endif if (((alta*100)/altb))>130 AND (not (t<51)) then T=T-15 endif if ((((sola+10)*100)/(solb+10)))>130 and (not (t>134)) then j=j+10 endif if (((saga*100)/sagb))>130 AND (not (j<116)) then j=j-10 endif gosub motor2 gosub motor1 LCDOUT $fe,2,#usta," ",#ustb," ",#altA," ",#altb lcdOUT $fe,$C0,#T," ",#j goto yap motor1: for i=0 to 25 PAUSEUS 20000-(T*10) PULSOUT PORTC.2,T next return motor2: for k=0 to 25 PAUSEUS 20000-(j*10) PULSOUT PORTC.3,j next return end
|
The lower the voltage the slower the motor.
Are the values displayed on the LCD what you expect, are they in range?
Dave
Always wear safety glasses while programming.
|
Most hobby servo's have a max voltage of 6v. The 450 mA should be OK for testing the servo unloaded.
If you have it turning a platform with large weight/mass then you can easily exceed 1A. A rule of thumb, the closer you get to maxing out the capabilities of your power supply the more noise you will see, especially true with motors, which could lead to glitches. I usually don't go over 50%, if I use a 2A supply for example, I only pull 1A.
Also, decoupling caps are a MUST! use inductors when feeding motors power with custom H-bridges. Use 0.1uf caps to filter out high frequency spikes at the motor and on your power supply to the PIC.
Do a search online for good engineering practice guides for dealing with inductive loads. There are tons of things that will go wrong working with inductive loads, you can solve most of them with well placed caps and careful layout.
Nick
|
Yes,I think,they are....
I follow t and j values by using lcd...
|
How many extra loops is he executing between servo updates?
|
thanks for the code.I am sorry it doesnt work properly..
First I get a error and I fixed code in compiler--------pauseus 20000-((t*10)+(j*10) you forgot a parenthesis
Servo stiil slower than usual mode
When I worked with your code even j values got out of range...Once I saw j as 195...
I might have another power problem like Macgman2000 said
You are right above.I have too many extra loops.I am stuck dont know what to do
Last edited by burak450; - 3rd October 2008 at 20:25.
|
Does it speed up if you disconnect one at a time?Servo stiil slower than usual mode
The PIC won't (i.e. shouldn't) care if there's 1, 2, or 3, or more servo's plugged in since it's not reading anything back from them.
|
Try this...see if it's any faster
Code:DEFINE LCD_DREG PORTB DEFINE LCD_DBIT 0 DEFINE LCD_RSREG PORTB DEFINE LCD_RSBIT 4 DEFINE LCD_EREG PORTB DEFINE LCD_EBIT 5 DEFINE LCD_BITS 4 DEFINE LCD_LINES 2 DEFINE OSC 4 DEFINE ADC_BITS 8 'A/D çevirim sonucu kaç bit olacak DEFINE ADC_CLOCK 3 'Clock kaynağı (3=rc) DEFINE ADC_SAMPLEUS 100 f var porta.0 : g var porta.0 : alta var byte : usta var byte : altb var byte ustb var byte : sola var byte : solb var byte : saga var byte : sagb var byte k var byte : t var byte : i var byte : j var byte : adcon1=2 : trisa=15 trisb=0 : portb=0 : trisc=0 : pause 1000 : lcdout $fe,1 : adcin 0,alta adcin 1,usta : adcin 2,sola : adcin 3,saga : t=150 : j=125 yap: adcin 0,altb : adcin 1,ustb : adcin 2,solb : adcin 3,sagb if ((((usta+10)*100)/(ustb+10)))>130 and (not (t>194)) then T=T+15 if (((alta*100)/altb))>130 AND (not (t<51)) then T=T-15 if ((((sola+10)*100)/(solb+10)))>130 and (not (t>134)) then j=j+10 if (((saga*100)/sagb))>130 AND (not (j<116)) then j=j-10 for i=0 to 25 : pauseus 20000-((t*10)+(j*10) : pulsout portc.2,t pulsout portc.3,j : next i lcdout $fe,2,#usta," ",#ustb," ",#altA," ",#altb, $fe,$C0,#T," ",#j goto yap end
Members who have read this thread : 0You do not have permission to view the list of names.
Posting Permissions
Bookmarks