$75.00 per ea

Quantity Price
ea $75.00
4+ $75.00
per ea
All prices shown are (inc. GST)


The Touch Board is a microcontroller board with dedicated capacitive touch and MP3 decoder ICs. It has a headphone socket and micro SD card holder (for file storage), as well as having 12 capacitive touch electrodes. It is based around the ATmega32U4 and runs at 16MHz from 5V. It has a micro USB connector, a JST connector for an external lithium polymer (LiPo) cell, a power switch and a reset button.

It is similar to the Arduino Leonardo board and can be programmed using the Arduino IDE. The ATmega32U4 can appear to a connected computer as a mouse or a keyboard, (HID) serial port (CDC) or USB MIDI device

Note: Micro SD card pictured is not supplied with the board.

Check out this interesting tutorial to learn more:
Touch Board and LEDs

Information & Downloads


  • - Microcontroller Atmel ATmega32U4
  • - Touch IC Resurgent Semiconductor MPR121
  • - MP3 decoder IC VLSI Solution VS1053b
  • - Audio output 15mW into 32Ω via 3.5mm stereo socket
  • - Removable storage up to 32GB via micro SD card
  • - Input voltage 3.0V DC – 5.5V DC
  • - Operating voltage 5V DC
  • - Max. output current (5V rail) 400mA (100mA at startup)
  • - Max. output current (3.3V rail) 300mA
  • - LiPo cell connector 2-way JST PH series - pin 1 +ve, pin 2 -ve
  • - LiPo charge current 200mA
  • - Capacitive touch electrodes 12 (of which 8 can be configured as digital I/O)
  • - Digital I/O Pins 20 (of which 3 are used for the MPR121 and 5 are used for the VS1053b — the latter can be unlinked via solder blobs)
  • - PWM channels 7 (shared with digital I/O pins)
  • - Analogue input channels 12 (shared with digital I/O pins)
  • - Flash memory 32 kB (ATmega32U4) of which 4kB used by bootloader
  • - SRAM 2.5kB (ATmega32U4)
  • - EEPROM 1kB (ATmega32U4)
  • - Clock speed 16MHz (ATmega32U4), 12.288MHz (VS1053b)
  • - DC current per I/O pin 40mA sink and source (ATmega32U4), 12mA source / 1.2mA sink (MPR121)
  • - Analogue input resistance 100MΩ typical (ATmega32U4)
    • *Specifications are subject to change without notice.

Warranty & Returns


We offer 12 months warranty on this product from its date of purchase. This is available from Altronics stores, online purchases or Altronics resellers. In accordance with our full warranty terms we will repair, replace or refund if goods you have purchased from us are defective.


Not withstanding our warranty policy, if you are dissatisfied with our goods or service you may return the goods within 14 days of our despatch date. Simply contact us for a return authorisation number and we will refund your purchase in full, less transport costs on receipt of goods. All returned goods must be in as sold condition including all packaging, instructions, invoices etc.

Accessories (Sold Separately)