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TTL

Two Dumb Questions; TX/RX LEDs on TTL and Wheel on Motor

Good evening everyone,

Two dumb questions:

One,

I'm working on getting simple RX/TX traffic indicator lights on a 3.3v TTL system.

 

The LED is a tri-color RGB LED (datasheet).  I'm trying to accomplish something like in this post here, the Olin answer.

Newbee: Arduino MEGA and ultrasonic URM37 V3.2

Hello,
I tried to start with developing something with my new Arduino (DFRduino
Mega 2560).

PIC Is TTL or CMOS?

Hi all, I have question about PIC16F877A... I need to interface it with other ICs like 7segment drivers,
and I have to choose between TTL and CMOS technology. But I can't find out on the datasheet if the mcu is in ttl or cmos one.
The final question is: have I to consider the 16f877a a ttl or a cmos IC?
Many THX in advance ;-)

Calculon's Arduino Serial madness, part 2

Hello LMR,

Calculon has been tinkering with his Arduino for a few months now and he likes it. He is at the point where he is trying to get his 'duino to communicate with another device. His question is: HOW?!?!?

More specifically:

1. Does he use the Serial.print command? Serial.write?

2. How does he send more than one byte at a tyme?

3. Here's an example of the required byte sequence:

     in hex: 0x8D, 0x7F
     in decimal: 141, 127

Does he just send one byte, and then another?