Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
The simplest way is to use 2 relays each with 1 NO and 1 NC contacts. The relays are driven by the 8051 using optocouplers follow by a npn transistor(my option). The power schematic is
V+ --- R1NO --- Motor---- R2NC - gnd
gnd -- R1NC--| |---R2NO - V+
If you close relay1, motor will rotate one sense. Closing relay2 will rotate the other sense
Another option is to use instead of relays 4 power transistors (or 2 transistor and 2 diodes) in a H configuration.
Fuses are necessary to be use.
Sorry,
drawwing by chars does not work as I expected.
Transistors T1 and T2 have to switched on at the same time for one direction. To change direction in oposit way T3 and T$ have to be switched on at the same time.
Do not forget to use PWM if u want to control speed
Hi
You can use L293 or L272 for smaller motors
Take a look at www.st.com for applications and data sheets,
also Allegro and NJRC for integrated components.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.