I want to use " serial out pin " as gernal output to drive relay
- Thread starter Mike.
- Start date
you should be able to do it, the M2 range allow use of the serial pins for general use, i have used both serial in and out on my 8 and 14 pin M2 chips as gp input/output.
how do you have the circuit connected? if you have the relay directly connected to the pin then that probably wont work assuming the relay coil needs more current to engage and the pins can only source around 20ma each, if you have a direct connection to the relay then you would need to use a transistor to be able to switch the higher current the coil would need to fully energise and latch.
what are the specs of the relay,coil current and required voltage for the coil?
how do you have the circuit connected? if you have the relay directly connected to the pin then that probably wont work assuming the relay coil needs more current to engage and the pins can only source around 20ma each, if you have a direct connection to the relay then you would need to use a transistor to be able to switch the higher current the coil would need to fully energise and latch.
what are the specs of the relay,coil current and required voltage for the coil?
first thanks for your reply !
I am using transistor Bc547 to switch 5v pcb mount relay.. on other pins the relay is working.. but I dont know how to use with serial out pin..
thanks again..
ok this is the software....
and how should I arrange hardware..
You could connect the serial out connection from the PICAXE to the download socket normally - before the resistor and transistor for the relay. However that would cause the relay to make a noise and rapidly turn on and off during a download. If that is an issue, then you can use a small switch or jumper to temporarily disconnect the transistor when doing a download.
What does that have to do with the Serial Out pin?
. My mistake.