> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 4x3 Button matrix keypad

**Type:** Product page · **SKU:** CE09447 · **Brand:** [Core Electronics](https://core-electronics.com.au/brands/core-electronics-australia)
**Page:** https://core-electronics.com.au/4x3-button-matrix-keypad.html ([markdown](https://core-electronics.com.au/4x3-button-matrix-keypad.html.md))

Maximize your input possibilities with our 4x3 Button Matrix Keypad! Featuring numeric, star, and hash keys, this versatile keypad conserves IO while adding functionality to any project. Perfect for Makers looking to streamline their designs.

## Pricing

- **Price:** $5.80 (inc GST) — $5.27 AUD, exc GST
- **Quantity discounts:** 5+ $5.16 (exc GST) · 15+ $5.01 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 21 today; more stock is typically available with a 8–12 day lead time.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=CE09447:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/CE09447:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

Add lots of buttons with few IO, grab this numerical keypad (with star and hash keys), and add it to your next project!

The output of the keypad is handled with a 3-column, 4-row matrix output, scanning for shorts between the two to determine which button is pressed.

### Features

- Same layout as a phone keypad, make it your own with tape and markers!
- M2 Mounting holes (46mm x 59mm)
 
### Specifications

- Dimensions: 51mm x 69mm x 10mm

### Examples

#### Raspberry Pi Pico - Micropython

 ```
from machine import Pin
import utime

# Defining the GPIO connected to keypad rows and columns (ordering important)
row_list = [10, 15, 14, 12]  
col_list = [11, 9, 13]

for x in range(0, 4):
  row_list[x] = Pin(row_list[x], Pin.OUT)
  row_list[x].value(1)

for x in range(0 ,3):
  col_list[x] = Pin(col_list[x], Pin.IN, Pin.PULL_UP)

# Define the symbol associated with each key
key_list = [["1", "2", "3"],\
      ["4", "5", "6"],\
      ["7", "8", "9"],\
      ["*", "0", "#"]]

# Scan the keypad to detect keypresses
def keypad(col, row):
  for r in row:
    r.value(0)
    result = [col[0].value(), col[1].value(), col[2].value()]
    if min(result) == 0:
      key = key_list[int(row.index(r))][int(result.index(0))]
      r.value(1)
      return (key)
    r.value(1)

while True:
  key = keypad(col_list, row_list)
  if key != None:
    print("key: "+key)
    utime.sleep(0.3)
```

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/k/e/keypad.jpg)