> **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

# Sound input module (4-pin)

**Type:** Product page · **SKU:** CE09434 · **Brand:** [Core Electronics](https://core-electronics.com.au/brands/core-electronics-australia)
**Page:** https://core-electronics.com.au/sound-module-4-pin.html ([markdown](https://core-electronics.com.au/sound-module-4-pin.html.md))

An all-in-one module for easily sensing sound!

## Pricing

- **Price:** $1.20 (inc GST) — $1.09 AUD, exc GST
- **Quantity discounts:** 25+ $1.04 (exc GST) · 50+ $0.98 (exc GST) · 100+ $0.93 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 26 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=CE09434:1` (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/CE09434:1.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

Featuring one analog and one digital threshold output this microphone breakout is really handy to have in your parts library.

The onboard potentiometer adjusts the threshold (note this is a 20-turn potentiometer, it can take a few turns to reach your desired sensitivity).

### Features

- Onboard LM393 amplifier
- Analog microphone output
- Audio threshold output
- A maker classic KY-038 sound module with lots of community support and libraries

### Specifications

- Supply voltage (Vcc): 3-5V
 
### Pinout

 | Pin function | Board silkscreen |
|---|---|
| Microphone Analog output | AO |
| Ground | G |
| Power input | + |
| Audio threshold | DO |

### Examples

#### Raspberry Pi Pico - Micropython

 ```
from machine import Pin, ADC
from time import sleep

# Initialization of ADC0
adc = ADC(0) #AO on the sound module to GPIO26<br></br>
# Initialization of GPIO18 as input
digital = Pin(18,Pin.IN, Pin.PULL_UP) #DO on the module to GPIO18

print("Sound Input Module test")

# Endless loop for reading out the ADC
while True:
    raw_value = adc.read_u16()
    # Conversion from analog value to voltage
    Volt = round(raw_value* 3.3 / 65536, 2)
    digital_value = digital.value()

    # Serial output of the analog value and the calculated voltage
    print("Analog voltage value: " + str(Volt) + " V\t Threshold value: ", end="")

    # Query whether the digital value has changed with serial output
    if digital_value == 1:
        print("reached")
    else:
        print("not reached")
    
    print("----------------------------------------")
    sleep(2)
```

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/o/sound.jpg)