IO Pi plus as switch
2035 Views - Created 19/06/2017
19/06/2017
Posted by:
Battos
Hi,I bought an IO Pi plus extension for my Raspberry pi 3 Model B.I have an output +2.5v on an other device and i would like to use the IO Pi Plus to act as a switch in order to closing and opening the circuit between the +2.5v and the ground of the other board.Currently, i haven't found a way to doing this with the IO Pi plus.My question is, is there a way of programming the IO Pi Plus extension board to act like i want ? Thank you in advance.
19/06/2017
Posted by:
andrew
Location:
United Kingdom
Hi
The IO Pi Plus will not be able to switch the +2.5V directly as it can only output 5V from its pins. What you will need is an external transistor to act as a switch.
The circuit below shows what you need to use. An NPN transistor is connected between the +2.5V and GND acting as the switch. A 500R resistor is connected between the IO Pi output and the transistor gate to limit the current to 10mA so that when the IO Pi output goes high it will turn on the transistor allowing current to flow. The 10K resistor is there to pull the gate low when the IO Pi output goes low ensuring the transistor fully switches off.
You will need to connect the ground on your other device to the ground on the Raspberry Pi to ensure they both have a common ground.
The IO Pi Plus will not be able to switch the +2.5V directly as it can only output 5V from its pins. What you will need is an external transistor to act as a switch.
The circuit below shows what you need to use. An NPN transistor is connected between the +2.5V and GND acting as the switch. A 500R resistor is connected between the IO Pi output and the transistor gate to limit the current to 10mA so that when the IO Pi output goes high it will turn on the transistor allowing current to flow. The 10K resistor is there to pull the gate low when the IO Pi output goes low ensuring the transistor fully switches off.
You will need to connect the ground on your other device to the ground on the Raspberry Pi to ensure they both have a common ground.
19/06/2017
Posted by:
Battos
Hi,Thank you very much for your explanation. I was afraid to be obligated to add a component. I will do what you explained.Thank you again !
Note: documents in Portable Document Format (PDF) require Adobe Acrobat Reader 5.0 or higher to view, download Adobe Acrobat Reader or other PDF reading software for your computer or mobile device.