system
April 4, 2010, 7:14pm
1
Hello,
I have this camera for a while now but it cause some problem after a while of usage (it stops working).
The data-sheet (http://www.comedia.com.hk/FP09/Spec_PDF/C328-7640.pdf under pin description) describes the TxD and RxD need 3.3V? I always thought TxD and RxD use 5V?
At the moment I use the Arduino Mega to control the C328, and send 5V TxD/RxD to it (I assume). Do I need to send 3.3V TxD and RxD from the Mega to the C328?
How can I do this? Is there hardware available for this (or will a voltage regulator also work?).
Thanks in advance.
Now continue the easter egg search!!
Cheers.
You probably needs one of these level-shifter ICs: Mixed-signal and digital signal processing ICs | Analog Devices Alternatively, you could try to drive your ATMega chip using 3.3V.
system
April 8, 2010, 5:41pm
3
Hi,
This could be an option to solve the problem. I've heard that because the TxD and RxD lines deliver a stable 5V voltage it is also possible to use a voltage divider.
In electronics, a voltage divider (also known as a potential divider) is a passive linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin). Voltage division is the result of distributing the input voltage among the components of the divider. A simple example of a voltage divider is two resistors connected in series, with the input voltage applied across the resistor pair and the output voltage emerging from the connection between them.
Resistor voltag...
Cheers /me
system
April 10, 2010, 7:15pm
4
Another question:
The C328 TxD provides a 3.3 V signal. This is connected to the Mega RxD that requires 5V.
Do I need to step up from 3.3V to 5V or will the Mega be able to handle 3.3V signals on its RxD pin?
Thanks in advance /me