lord loh.
Member
I am building a general purpose development board for the AVR. It is a bit like the breadboard, but with hardwird VCC, Gnd etc and a mounted dip switch, LEDs and a few microswitches (push buttons).
I would like to add RS232 interface using MAX232 and also a circuit for driving stepper motors. I did start with Nigel's Tutorials - Hardware section.
The blocks that I find are...
1. The MAX232 circuit has 2Tx buffers and 2Rx buffers. The RS232 interface uses just 1 of each. At https://www.pjrc.com/tech/8051/board3/schematic.html, these guys have put 2 RS232 interface. Is that all that is needed? Is the MAX 232 designed with 2 RS232 (DB9 subset) interface in mind. Are there other ways of using the MAX232?
2. Can a stepper motor driver circuit be implemented using the L293D dual half H-Bridge ICs? Can such a circuit drive any stepper motor?
I would like to add RS232 interface using MAX232 and also a circuit for driving stepper motors. I did start with Nigel's Tutorials - Hardware section.
The blocks that I find are...
1. The MAX232 circuit has 2Tx buffers and 2Rx buffers. The RS232 interface uses just 1 of each. At https://www.pjrc.com/tech/8051/board3/schematic.html, these guys have put 2 RS232 interface. Is that all that is needed? Is the MAX 232 designed with 2 RS232 (DB9 subset) interface in mind. Are there other ways of using the MAX232?
2. Can a stepper motor driver circuit be implemented using the L293D dual half H-Bridge ICs? Can such a circuit drive any stepper motor?