programming for relay

[bikash123]

Dear Friends, i have some problems with relay . which is interface with PIC microcontroller. Plz suggest me what will be the program.

 

[#MAAM#]

Dear bikash123,

the relay is a electronics device when current flow on it's coil the state is inverted. It mean N.O converted to N.C and N.C converted to N.O. So the output from micro controller is digital so we use 1 or 0. we deal with relay only two states 1 or 0 upon the application required. we use interface as in image



use R1=1k
R2=10k

 

[bikash123]

Thanks Sir for suggestion. but what would be program for it. how to write it? I am using micro c as my compiler. I am just using it in between solar module and battery. Plz give me one example related with this so that i will solve it.

 

[adnan_merter]

dear bikash123,

the only thing you have to do is just connect one of your mcu's pins to the r1 in the schematic given by #MAAM# , and provide logic 1 to the pin you connected.

that is so easy,

considereing you connected your relay to pic's C0 pin; you should type

PORTC.F0 = 1

you can hear the tick sound from your relay

bye the way i dont use micro c i just found the statement from its manuel

here is manuel **broken link removed**

 

[#MAAM#]

dear bikash123,

the only thing you have to do is just connect one of your mcu's pins to the r1 in the schematic given by #MAAM# , and provide logic 1 to the pin you connected.

that is so easy,

considereing you connected your relay to pic's C0 pin; you should type

PORTC.F0 = 1

you can hear the tick sound from your relay

bye the way i dont use micro c i just found the statement from its manuel

here is manuel **broken link removed**

please do this.

 

[Tahmid]

Let's assume you're using PORTC 0 (like adnan mentioned above).

To make current pass through the relay coil, the transistor should be turned on. It's base is connected via a resistor to RC0.

So, in the code, whenever, you need to turn make current go through the relay coil, you have to use:

PORTC.B0 = 1;

or

PORTC.F0 = 1;

or

RC0_bit = 1;

To stop current flow through the coil, you have to use:

PORTC.B0 = 0;

or

PORTC.F0 = 0;

or

RC0_bit = 0;

When RC0 is high (1), the transistor is turned on and current flows through the relay coil.
When RC0 is low (0), the transistor is turned off and current does not flow through the relay coil.

You should learn about the PIC I/O operations. Otherwise, you'll face problems when writing codes. Read about associated registers, writing data to bytes and also bit manipulation.

Here is a free book about programming PICs with mikroC: https://www.mikroe.com/eng/products/view/285/book-pic-microcontrollers-programming-in-c/

Hope this helps.
Tahmid.