2pcs tb371 4 mcu key on switch matrix is suitable for 2560 due raspberry pi banana pi breadboard fpga cpld st2

Product Name:Tb371 2pcs 4 Mcu Key on Switch Matrix Is Suitable For 2560 Due Raspberry Pi Banana Pi Breadboard Fpga Cpld St2

Packing list(Does not include R3):2 PCS 4 key push on switch;

Descrtion:

Can be inserted directly into Arduiuo 2560 due,Ideal for linking up to your Arduiuo Mini Nano 2560 Breadboard raspberry pi banana pi etc,or others MCU PLD CPU ( A ST2 ARM C51 NRF24LE1 CC2530 MSP430 STM8 FPGA CPLD etc.)

1 4-on Common Cathode key module(When preed output low level).

2 '' GND K1 K2 K3 K4'' 4 PIN OUT 2.54mm

3 Working voltage: DC 0-48 Size: 12.7MM x 33MM.

Arduiuo /2560 Code/******************************************************//*Arduiuo_4key_uartThis example code is in the public domain.*// Define key pinint K1 = 13;int K2 = 12;int K3 = 11;int K4 = 10;/ variables will change:int onState = 0; / variable for reading the pushon status/ the setup routine runs once when you pre reset:void setup() {/ initialize the keys pin as an input.pinMode(K1, INPUT);pinMode(K2, INPUT);pinMode(K3, INPUT);pinMode(K4, INPUT);/Activate key pin internal pull-up sdialWrite(K1, HIGH);dialWrite(K2, HIGH);dialWrite(K3, HIGH);dialWrite(K4, HIGH);/ initialize serial communications at 9600 bps:Serial.begin(9600);}/ the loop routine runs over and over again :void loop() {onState = dialRead(K1);if(!onState)Serial.print(''k1 /n'' );do{onState = dialRead(K1);}while(!onState);/Wait on releaseonState = dialRead(K2);if(!onState)Serial.print(''k2 /n'' );do{onState = dialRead(K2);}while(!onState);/Wait on releaseonState = dialRead(K3);if(!onState)Serial.print(''k3 /n'' );do{onState = dialRead(K3);}while(!onState);/Wait on releaseonState = dialRead(K4);if(!onState)Serial.print(''k4 /n'' );do{onState = dialRead(K4);}while(!onState);/Wait on releasedelay(100);}/******************************************************/

Circuit schematics :