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I am trying to interface matrix keypad. I made my own having 5 buttons (3 rows and 2 columns).
Like this:
...D0 D1 D2
D3 * * *
D4 * *
(D3, D0 = LEFT)
(D3, D2 = RIGHT)
I only need 5 keys, so I left the part (D4, D2).
The 3 columns are connected to pins D0-D2 (starting from left)...
Its been fixed now. I rewrote the code all over again. Now its fixed. The led glowed as it should have. What I suspect had happened may be my blunder mistake. I suspect I did DDRB and PORTD. Since I rewrote the program I seem to have fixed this blunder.
Thank you for your help. !
I was just testing atmega32 by making a blink program. But the output at the pin is very low of about 1.5v. Shouldn't it be at 5v? Due to this the led does not glow bright. Previously it used to glow bright but not now. I thought it was uC fault, and tried another one. But the same problem...
Here is something I learned. Tell me if i get something wrong:
1. Use avrdude (most probably) to set the low and high fuse bits (0xFF and 0x98 in this case)
2. Program the bootloader hex code to the avr
Now all i need to do is get the bootloader to run and program my actual program.
How do i do...
I now have your hex file. After I burn it what should I do to program my chip? And what about those fuse bits? How should I set it up? I have a usb to rs232 cable. It would be helpful if you can elaborate the process a bit.
Thank You
I want a precompiled atmega32A bootloader. I searched the internet but could not find any helpful tutorial for avr bootloader. I want to preprogram the bootloader with any hardware programmer (my friend has one) in my atmega32A and then later use rs232 (using usb to serial converter) with max232...
How can putting a current limiter help? Also if I lower (limit) the current to a small value then it will take more time to charge my phone, won't it?
About the LDO regulator, what is it? Can I make one?
Thanks.
I hooked up with a book yesterday: Microelectronic Circuits, Adel S. Sedra and Kenneth C. Smith. According to this book as a rule of thumb, Vbb = 1/3 Vcc, Vcb = 1/3 Vcc, IcRc = 1/3 Vcc. And as for 10/1 I suppose it means current through VDB resistors should be 10 Ie to 0.1 Ie. I think...
Does that mean I can charge right (until my Ni-Cd voltage drops below some point)? I just needed it to charge my phone when I don't have any charging devices around.
Then what can be done for this to provide 5V even when connecting the phone.
I have a Ni-Cd battery rated 4.8V 500mA. It has its own charger so I can charge it. Now I want to use this battery (not battery charger) to charge my smart phone. My smart phone's charger has ratings 5V 700mA. When I measure the Ni-Cd open circuit voltage (at full charge) it shows 5.1-5.5 V. So...
The question is as below:
Design a voltage divider type dc biased CE amplifier to obtain B (beta) independent biasing. Use appropriate guidelines to support your design. Given parameters are: Vcc = 12 VDC, Ic = 2 mA, B (beta) = 150.
From what I know, we can use 1/3 rule or 10/1 rule. For this...
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