Adafruit PiCowbell Adalogger for Pico - MicroSD, RTC & STEMMA QT
73 units available with a short lead time.
The Adafruit PiCowbell Adalogger is a Pico-sized add-on board that sockets underneath your Raspberry Pi Pico or Pico W, adding a microSD card slot, real-time clock with battery backup, and a STEMMA QT connector for I2C sensors — everything you need for data logging projects.
The PCF8523 RTC keeps accurate time even when the Pico is powered off (with a CR1220 coin cell). The microSD card slot provides virtually unlimited storage for reading or writing data. A STEMMA QT / Qwiic connector gives you instant solderless access to I2C peripherals on GPIO 4 (SDA) and GPIO 5 (SCL).
Key Features
- MicroSD Card Slot – SPI connection on pins 16, 17, 18, 19 with optional card detect on pin 15
- PCF8523 Real-Time Clock – I2C RTC with CR1220 coin cell backup for accurate timestamps
- STEMMA QT / Qwiic – Right-angle JST SH connector for solderless I2C (GPIO 4/5)
- Right-Angle Reset Button – Easy access from the board edge
- Pico Form Factor – Same size and shape, sockets underneath the Pico
- Gold-Plated Pads – Easy soldering with duplicate solder-jumper pads
- White GND Markings – Ground pads clearly identified with silkscreen rectangles
Header Options
- Stacking Headers – Allows breadboard or accessory connection below
- Socket Headers – Solid plug-in connection with no protruding pins
- Short Socket Headers – Ultra-slim sandwich (pair with short plug headers on the Pico)
- Direct Soldering – Most compact option, but permanent
Ideal For
- Environmental data logging with timestamped SD card storage
- Sensor projects needing persistent timekeeping
- Adding expandable storage to Pico/Pico W projects
The Adafruit PiCowbell Adalogger for Pico - MicroSD, RTC & STEMMA QT appears in the following collections:
