June 06, 2021 by share Open-Tech
Using a free Raspberry Pi Pico emulator, learn Arduino style coding for Raspberry Pi Pico and membrane keypad.
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Raspberry Pi Pico is a tiny low cost MCU from Raspberry! It is tiny but very user friendly. It has following features
Below are the features of the RP2040 microcontroller:
The project is a simple application which interfaces a membrane keypad to the Pi Pico board. there are 8 blue LEDs mapped to numbers 1 to 8 on the keypad. The complete code is made available in the below section.
The connection diagram is given in the next section
Wokwi Raspberry Pi Pico simulator - Keypad membrane and LEDs interface on Pi Pico emulator
#include <Keypad.h>
const uint8_t LEDS = 12;
const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
{ '1', '2', '3', 'A' },
{ '4', '5', '6', 'B' },
{ '7', '8', '9', 'C' },
{ '*', '0', '#', 'D' }
};
// Pins connected to LED1, LED2, LED3, ...LED12
uint8_t ledPins[LEDS] = { 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 28, 27 };
uint8_t rowPins[ROWS] = { 26, 22, 21, 20 }; // Pins connected to R1, R2, R3, R4
uint8_t colPins[COLS] = { 19, 18, 17, 16 }; // Pins connected to C1, C2, C3, C4
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
void setup() {
for (uint8_t l = 0; l < LEDS; l++) {
pinMode(ledPins[l], OUTPUT);
digitalWrite(ledPins[l], LOW);
}
}
void loop() {
char key = keypad.getKey();
if (key != NO_KEY) {
switch (key) {
case '1': digitalWrite(ledPins[0], HIGH);
break;
case '2': digitalWrite(ledPins[1], HIGH);
break;
case '3': digitalWrite(ledPins[2], HIGH);
break;
case '4': digitalWrite(ledPins[3], HIGH);
break;
case '5': digitalWrite(ledPins[4], HIGH);
break;
case '6': digitalWrite(ledPins[5], HIGH);
break;
case '7': digitalWrite(ledPins[6], HIGH);
break;
case '8': digitalWrite(ledPins[7], HIGH);
break;
case '9':
for (uint8_t l = 0; l < 8; l++) {
digitalWrite(ledPins[l], HIGH);
}
break;
case '0':
for (uint8_t l = 0; l < 8; l++) {
digitalWrite(ledPins[l], LOW);
}
break;
case 'A': digitalWrite(ledPins[8], HIGH);
break;
case 'B': digitalWrite(ledPins[9], HIGH);
break;
case 'C': digitalWrite(ledPins[10], HIGH);
break;
case 'D': digitalWrite(ledPins[11], HIGH);
break;
case '*':
for (uint8_t l = 8; l < 12; l++) {
digitalWrite(ledPins[l], HIGH);
}
break;
case '#':
for (uint8_t l = 8; l < 12; l++) {
digitalWrite(ledPins[l], LOW);
}
break;
}
}
}
membrane keypad interface and Pi Pico interface - simulation output
Please share your feedback on the project and the Raspberry Pi Pico emulator from the Wokwi website. You can have more information on the Raspberry Pi Pico simulator here.
If you have any questions, please hop on to the Wokwi Discord server. Please visit Electrotantra YouTube channel for more videos on the Arduino and Raspberry Pi Pico simulators.
Thank you ?
Hardware enthusiast with ample interest in Arduino projects
