That cannot be done. The ULN2003 is a low side driver *only*. To form a switching matrix you need both low and high side drivers.how to implement relay matrix using uln2003 without using any gate?
basically there will be one gpio expander 8+8 is there with that we will make 8*8 relay matrix....and only one relay need to be selected..
akThat cannot be done. The ULN2003 is a low side driver *only*. To form a switching matrix you need both low and high side drivers.
Is it working?now i am using two drivers one for high side and another for low side..as you all have suggested
There are crosspoint arrays used in telecoms, but I doubt they'll handle the current draw of relay coils.how to implement relay matrix using uln2003 without using any gate?Its urgent.Waiting for your response..
It is a consequence of a design tradeoff. If you have 48 relays you want to control, one way to do that is tie one end of all of the relays to V+, and have 48 driver transistors (in 7 ULN2003's) , one for each relay. You can turn on any of the relays in any combinations but that's a lot of parts.Why do we need one high side driver and low side driver in the relay matrix?
by Jake Hertz
by Duane Benson
by Jake Hertz
by Duane Benson