log. voltage

Community General Discussions
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1

Theta_-_mainboard.JPG (121587Bytes)
theta_test.c (288Bytes)

Hi, in my new robot I am using ATmega644, but I need hepl with log. votage. In AVR Studio I set PB7 out and set log 1, but when I measure voltage between PB7 and GND, multimeter shows 0.8 - 1.1 V. Had anybody same problem? But it is not only PB7.  The 0.8 - 1.1 V are on all ports. When I put atmega in to breadboard everything is OK.

I have connected LCD to PORTB and PB7 is controlled backlight. When PB7=1 then backlight on but when I measure voltage on PB7, multimerer shows 0.8 Volts.

 

Theta_-_mainboard.JPG
Theta_-_mainboard.JPG799×546 119 KB

theta-main2.jpg
theta-main2.jpg742×557 57.3 KB

 

 

theta-main3.jpg
theta-main3.jpg654×558 62.9 KB

theta-main1.jpg
theta-main1.jpg927×565 69.8 KB

theta-main0.jpg
theta-main0.jpg722×549 55.1 KB

2

When you make a screen shot

When you make a screen shot for your schematics then do not reduce the picture size. Upload it as it is and un-check the checkbox which resizes your picture to 500px.

3

yep, I try, but the pic what

yep, I try, but the pic what I take have low resolution.

4

https://picasaweb.google.com/

https://picasaweb.google.com/117478617231202648212/ThetaMainboard

5

After struggling with your code,

C is a bit foreign to me, I did run across something that made me question it; PORTB&=~(1<PB7); . Is the (1<PB7) a typo? Should it be (1<<PB7) ?