SparkFun Thing Plus Dual-Port Logging Shield
Description
- SparkFun Thing Plus Dual-Port Logging Shield
- Versatile dual-port logging shield for Thing Plus/Feather boards
- Fast read and write speeds up to 35 MBytes/second
- Supports FAT32, exFAT, and NTFS on cards up to 32GB
- Easy mode switching with simple I2C commands
The SparkFun Thing Plus Dual-Port Logging Shield is a Thing Plus/Feather-compatible board designed to enable access to a microSD card via both SPI and USB-C interfaces. This versatile shield can be mounted on or under a Thing Plus board, providing the ability to log data to and read data from the microSD card using a preferred Arduino SD library.
In addition to SPI access, the shield can be connected to a computer through a USB-C port, allowing for read and write speeds of up to 35 MBytes/second. The actual write speed is dependent on the card, but tests have shown speeds around 20 MB/s.
An ATtiny841 microcontroller on the shield serves as an arbiter, automatically switching the Dual-Port Logging Shield into SPI mode when the Thing Plus is powered up. This enables the Arduino code to access the microSD card as usual. When powered via USB-C from a computer, the ATtiny841 puts the shield into SDIO "thumb drive" mode, allowing for quick data transfer.
If both the Thing Plus and computer are connected simultaneously, the ATtiny841 can be given simple commands over I2C to switch between the two modes. The ATtiny can also be configured to default to either SPI mode or SDIO "thumb drive" mode when both power sources are active.
Please note that the USB2241, which provides the USB interface, supports FAT32, exFAT, and NTFS on cards up to 32GB. Cards larger than 32 GB are not supported.
- 1x SparkFun Thing Plus Dual-Port Logging Shield
- Thing Plus / Feather-compatible footprint and breakout pins
- ATtiny841 microcontroller
- USB2241 Ultra Fast USB 2.0 Media Controller
- Supports cards up to 32GB
- Supports FAT32, exFAT and NTFS
- Read and write speed: up to 35 MBytes/second (card-dependent)
- Push-push microSD socket
- Simple I2C command set to switch modes and set the default mode
- Can be powered by: Thing Plus / Feather 3.3V, USB-C 5V, or both
- Full power control - Sleep current (PWR LED disabled): 300 µA
- Power source voltage sensing
- Activity LED (for SDIO thumb drive mode)
- Power LED (configurable)
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Refund Policy
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
This return policy also applies, as a minimum standard, to products sold and fulfilled by third-party vendors through the Marketplace.
Please review the Return Conditions, Return Exceptions and the process on How to Request a Return Authorisation (RA) before initiating a return request.
United Kingdom consumers exercising their statutory Right of Cancellation are subject to different conditions. See the Statutory Right of Cancellation.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at the Vendor's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
- A valid Return Authorisation (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
- The RA number is valid for 30 days. The returned item must be received within that period.
- The RA number must be included with the return.
- Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
- Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RobotShop's troubleshooting process or of a verified shipping error by RobotShop.
- Refunds are processed within 7 days after receipt and inspection of the returned item.
- A £100 cleaning fee may apply to domestic robots returned in used or unclean condition.
- A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RobotShop's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
- Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
- Consumables * — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tyres, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
- Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
- Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odour-absorbing products). Not eligible for return once unsealed.
- Build-it-yourself products and items requiring customer assembly * — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
- Digital Goods, Software, and Apps * — Final sale only, due to licensing restrictions.
- Clearance Items * — Products identified as clearance or final sale, including end-of-life or discontinued items.
- Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
- On-Demand Items * — Standard catalogue products not stocked by RobotShop and ordered specifically to fulfil a customer request.
- Professional & Specialized Equipment — See the Professional & Specialized Equipment Warranty page and Professional & Institutional Buyers (B2B) section in the Terms & Conditions.
* United-Kingdom consumers retain their statutory Right of Cancellation on these items. Its exercise is subject to the conditions and exclusions set out in the Statutory Right of Cancellation, and any reimbursement may be reduced to reflect a loss in value resulting from handling beyond inspection.
How to Request a Return Authorisation (RA)
While the same return policy applies, these orders require a separate contact process for returns.
- RobotShop Fulfilled Orders → submit a support ticket from your account under My Support Tickets.
- Marketplace Vendor Orders → submit a ticket from your account under My Marketplace Tickets to contact the vendor directly.
Note: Marketplace vendor products are normally labelled with SKUs starting with RM, and identified on the product page with the mention "Sold and fulfilled by [Vendor Name]".