[Systems Engineering Teachers' Mailing List] Re: PICAXE

[Peter A Ward]

Thanks Rob,
I must admit I forgot about those transistors that were built into  
that picaxe board which was designed by my brother. Roger you my like  
to contact him as he has some nice picaxe board designs which work  
well in secondary student projects.
You will get Rob at....	ward.robert.c at edumail.vic.gov.au
Cheers
Peter A Ward
ePotential Coordinator
Euroa Secondary College
ward.peter.a at edumail.vic.gov.au

On 28/06/2008, at 7:11 PM, Rob Gray wrote:

> Hi Roger,
>
> If you run the output signal(s) from the picaxe through a transistor  
> such as a BD 140, that will give it enough grunt to drive the coil  
> of most relays.   A peek at Peter's second picture shows two such  
> transistors on the circuit.
> My students have used this technique to drive windscreen motors via  
> a relay in the past with great success.
>
> The advantage of using relays is the ability to reverse the motor  
> should they need to.
>
> Best of luck with it.
>
> Rob Gray