16f628a help

trojan89 · Mar 7, 2010

I am currently doing a project using the pic 16f628a microcontroller. I have tested the prorgram using the oshon pic simulator ride. I want to interface the micro controller to a 12v relay. But am not able to activate the relay. Could someone please suggest a relay interface circuit?
And can i use a 40 pin pic evaluation board to program a 18pin pic?
And any further help would be greatly appreciated

Nigel Goodwin · Mar 7, 2010

Check my PIC tutorials, the Hardware Extras section shows how to connect a relay.

rajbex · Mar 7, 2010

A relay circuit requires a transistor (or two transistors in Darlington Pair configuration) as a driver. Look at this circuit Experiments with PIC16F628A: Experiment No. 9: DC Motor Speed Control using PWM to drive a motor; you can replace the motor with a relay. Here, is what you can try. Replace the DC motor with a 12 V relay, and change the power supply to 12V. And then, when you give 5V to the input pin, the relay should turn ON. If that works then you should be able to control the relay with PIC16F628A too.

I don't know what 40-pin evaluation board are you talking about, but if that board would be able to program a PIC16F628A, it must be mentioned on it's user's guide.

- Raj

trojan89 · Mar 8, 2010

rajbex said:
A relay circuit requires a transistor (or two transistors in Darlington Pair configuration) as a driver. Look at this circuit Experiments with PIC16F628A: Experiment No. 9: DC Motor Speed Control using PWM to drive a motor; you can replace the motor with a relay. Here, is what you can try. Replace the DC motor with a 12 V relay, and change the power supply to 12V. And then, when you give 5V to the input pin, the relay should turn ON. If that works then you should be able to control the relay with PIC16F628A too.

I don't know what 40-pin evaluation board are you talking about, but if that board would be able to program a PIC16F628A, it must be mentioned on it's user's guide.

- Raj

The evaluation board looks similar to the pic below
**broken link removed**
The prob is i have a 18 pin pic and the adaptor is for a 40 pin one. So i want to just connect pin to pin according to the data sheets.Will i be able to do that?
And to program a pic is it enough if i connect pins 13 12 10 and 5?
Thank you again

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