



Pimoroni PMW3901 Optical Flow Sensor Breakout
Flash Sale end in:
1 in stock (can be backordered)
Delivery & Return Rules
Same-Day Delivery for ISB/RWP
Policy: Orders placed before 3:00 PM for delivery within Islamabad/Rawalpindi will be delivered the same day. Orders placed after this time will be delivered the next business day.
Quick Returns
Explanation: We aim for a smooth return experience.
Policy: Returned items will be processed within 3–5 business days of receiving the item, and you will be notified once the return is approved.
Exchange for Misquoted Items
Explanation: We take full responsibility for product listing accuracy.
Policy: If the item you received is significantly different from its description or image, you can request an exchange.
Wrong or Damaged Products
Explanation: We ensure product quality and accurate shipping.
Policy: If you receive an incorrect product or one that is damaged during shipment, you are eligible for a free exchange.
Complete Package Assurance
Explanation: Your order should arrive complete and in perfect form.
Policy: If any accessory, component, or part is missing from the package, we will ship the missing parts after confirmation.
Video Proof of the Items
Explanation: Helps verify the condition of the product upon delivery.
Policy: An unboxing video is mandatory at the time of opening the package. The video must clearly show the sealed package being opened, the product, and all included components. This is required for any claims related to:
- Missing items
- Damaged products
- Wrong deliveries
Without this video proof, we will not be able to process returns or exchanges.
No Warranty for Electronic Products
Explanation: Most electronic items are sold as-is and cannot be returned once used.
Policy: Electronic products are not covered under warranty. We recommend testing the item as soon as you receive it. Exchanges are only allowed if the product is damaged on arrival or incorrectly delivered.
Return Request Timing
Explanation: We operate within a strict return window.
Policy: All return/exchange requests must be submitted within 10 days (local orders) and 20 days (bulk orders) from the invoice date.
Online Return Requests Only
Explanation: Streamlined and trackable process.
Policy: All return and exchange requests must be raised through our official website.
Proof of Purchase Required
Explanation: Ensures authenticity of your claim.
Policy: A copy of your invoice or order confirmation is required for any return, exchange, or or claim.
Order Cancellation Policy
Policy: Only those orders that are still in processing or have not yet been shipped are eligible for cancellation.
Explanation: Once an order has been shipped, it cannot be canceled under any circumstances. If your order is still in the processing stage or has not yet been dispatched, you may request a cancellation.

TECHNICAL DOCUMENTATION FILES
Features
- PMW3901 optical flow sensor
- Two white LEDs on-board for illumination
- Frame rate: 121 FPS (frames per second)
- Speed: 7.4 rad/s (radians per second)
- Field of view: 42°
- Range: ~80mm to infinity
- 6mA typical current draw
- SPI interface
- 3.3V or 5V compatible
- Reverse polarity protection
- Compatible with all models of Raspberry Pi and Arduino
- Python library
Connecting to your Raspberry Pi
If you’re not using our Breakout Garden HAT with SPI, then this is how to connect your Optical Flow Sensor Breakout up to your Raspberry Pi. Our library is set up to use the front SPI slot by default: BCM 7 for CS, BCM 11 for SCK, BCM 10 for MOSI, BCM 9 for MISO, and BCM 19 for the INT pin. Here’s which pins to connect between your Optical Flow Sensor Breakout and your Pi’s GPIO (note that it’s BCM pin numbering):
- 3-5V to any 5V or 3V pin
- CS to BCM 7
- SCK to BCM 11
- MOSI to BCM 10
- MISO to BCM 9
- INT to BCM 19
- GND to any ground pin
You can of course use other pins but you’ll have to change them accordingly when you instantiate the sensor in your code.
Package Includes
- 1 x Pimoroni PMW3901 Optical Flow Sensor
- 1 x Male Header
Weight | 4 g |
---|---|
Dimensions | 24 × 24 × 5 mm |
Manufacturer | Pimoroni |
Product number | 397-PIM453 |
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