Description: Brand:Eletechsup Product Name ：Universal Surface Mounted PCB Keypad Momentary Keypad 2.54mm Pitch Control Key Description: Ideal for linking up to your raspberry pi AVR STM32 RM PIC AT89C51 STC MSP430 STM8 STM32 XILINX ALTERA FPGA CPLD etc. 1 4-button Common Cathode key module . 2 " GND K1 K2 K3 K4" 4 2.54mm Pads (Can be welded: Wires/Male Pin Header/Female Pin Header) 3 Size: 12.7MM x 33MM. Circuit schematics : Arduino uno/mega2560 Code //******************************************************// /* Arduino_4key_uart This example code is in the public domain. */ // Define key pin int K1 = 13; int K2 = 12; int K3 = 11; int K4 = 10; // variables will change: int buttonState = 0; // variable for reading the pushbutton status // the setup routine runs once when you press 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 resistors digitalWrite(K1, HIGH); digitalWrite(K2, HIGH); digitalWrite(K3, HIGH); digitalWrite(K4, HIGH); // initialize serial communications at 9600 bps: Serial.begin(9600); } // the loop routine runs over and over again forever: void loop() { buttonState = digitalRead(K1); if(!buttonState)Serial.print("k1 \n" ); do { buttonState = digitalRead(K1); } while(!buttonState);//Wait button release buttonState = digitalRead(K2); if(!buttonState)Serial.print("k2 \n" ); do { buttonState = digitalRead(K2); } while(!buttonState);//Wait button release buttonState = digitalRead(K3); if(!buttonState)Serial.print("k3 \n" ); do { buttonState = digitalRead(K3); } while(!buttonState);//Wait button release buttonState = digitalRead(K4); if(!buttonState)Serial.print("k4 \n" ); do { buttonState = digitalRead(K4); } while(!buttonState);//Wait button release delay(100); } //******************************************************// 66
Price: 6.99 USD
Location: Guangzhou
End Time: 2024-11-02T06:45:02.000Z
Shipping Cost: 0 USD
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Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Brand: Unbranded
Type: RCA
Country/Region of Manufacture: China
Custom Bundle: No
Manufacturer Warranty: 1 Month
Available Variations
Color: 5 PCS
Price: 11.39 USD
Available Quantity: 10
Quantity Sold: 0
Color: 1 PCS
Price: 6.99 USD
Available Quantity: 10
Quantity Sold: 0
