Digital input & Relay output card for Raspberry Pi 3 Model B

Question

Hi I am looking for Digital input & Relay output card for Raspberry Pi 3 Model B. so help me which card will be compatible for this application. by this card I want to interface Push Button input to Raspberry Pi & want to switch ON relay for further control. for more detail you can refer attach file. Thanks Prasanna Jirafe 9922135365 
 Attachments: RP.docx

rew · Answer

I designed a card with relays that fits on your raspberry pi: Raspberry Relay

It has a few breakout connectors intended for SPI and UART, but those can be used for buttons if you want (and don't need the SPI or UART).

Sean_Miller · Answer

You can make this. You need a tactile switch, 10K pull-up resistor, an NPN transistor, 1K resistor between the Pi output and transistor gate, and a relay. You can google the schematic.

mcb1 · Answer

Even better use the opto-coupled relays and you might need to reduce the series resistor

RELAYS and POWER CONTROL

Read the note about reducing the series resistor when driving from the Raspberry Pi.

NOTE: It is sometimes possible to use these relay boards with 3.3V signals, IF the JD-VCC(RelayPower) is provided from a +5V supply and the VCC to JD-VCC jumper is removed. . That 5V relay supply could be totally isolated from the 3.3V device, or have a common ground IF opto-isolation is not needed. If used with isolated 3.3V signals, VCC (To the input of the opto-isolator, next to the IN pins) should be connected to the 3.3V device's +3.3V supply. NOTE: Some RaspberryPi users have found that some relays are reliable and others do not actuate sometimes. It may be necessary to change the value of R1 from 1000 ohms to something like 220 ohms, or supply +5V to the VCC connection.

Mark

rew · Answer

Click "add to cart", follow the directions and I'll ship it to you in India.... :-)