https://github.com/thunderfly-aerospace/tfprobe01

Omnipolar magnetic and reflective optical probe.
https://github.com/thunderfly-aerospace/tfprobe01

magnetic-sensor pixhawk-flight-controller probe px4 reflectivity-sensor rpm sensor sensor-probe uav

Last synced: 5 months ago
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Omnipolar magnetic and reflective optical probe.

• Host: GitHub
• URL: https://github.com/thunderfly-aerospace/tfprobe01
• Owner: ThunderFly-aerospace
• License: gpl-3.0
• Created: 2020-10-26T18:44:43.000Z (over 5 years ago)
• Default Branch: TFPROBE01A
• Last Pushed: 2025-03-05T17:04:41.000Z (over 1 year ago)
• Last Synced: 2025-06-13T22:39:25.150Z (about 1 year ago)
• Topics: magnetic-sensor, pixhawk-flight-controller, probe, px4, reflectivity-sensor, rpm, sensor, sensor-probe, uav
• Homepage: https://docs.thunderfly.cz/avionics/TFRPM01/#tfprobe01a---omnipolar-magnetic-and-reflective-optical-sensor-probe
• Size: 5.26 MB
• Stars: 1
• Watchers: 4
• Forks: 2
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# TFPROBE01A - Omnipolar magnetic and reflective optical sensor probe

![KiCad](https://github.com/ThunderFly-aerospace/TFPROBE01/workflows/KiCad/badge.svg)

The sensor is designed for RPM measurement with [TFRPM01 sensor board](https://github.com/ThunderFly-aerospace/TFRPM01). The probe consists dual sensing technique - optical or magnetic. Therefore the user should select the one most suitable for the application.









> This device was developed by [ThunderFly s.r.o.](https://www.thunderfly.cz) and is published as OpenSource hardware with a [GPLv3](LICENSE) license. It is commercially available, for a quote contact us by email at info@thunderfly.cz. Or buy it directly together with a [TFRPM01](https://docs.thunderfly.cz/avionics/TFRPM01/) sensor at [Tindie store](https://www.tindie.com/products/thunderfly/tfrpm01-drone-rpm-tachometer-sensor/).

### Magnetic Sensing

The magnetic Hall-effect sensor mounted on the probe board can sense both directions of the magnetic field. The strength of the magnetic field is a decisive parameter for the probe's correct function. The magnetic flux is expected to be perpendicular to the sensor PCB surface. The detailed requirements of magnetic flux density are described in [AH3572 datasheet page 4](/doc/datasheets/AH3572-1483253.pdf).

In magnetic sensing, it is recommended to cover the probe in a black shrinking tube.  The covering blocks function of a reflective sensor.

### Optical Sensing

An optical sensor is sensitive to the infrared reflectance of material (usually a rotating disc with marks).

To details see the [VCNT2020 datasheet page 2](/doc/datasheets/vcnt2020.pdf)

## Hardware

TFPROBE01A is designed as Open-Hardware (GPL v3). All documentation is located in this repository.

The TFPROBE01 is sold and shipped without a soldered header, because its orientation may depend on the customer's use. Connecting cable and two headers (one straight and one right-angled) are included.

![Shipping content](/doc/img/TFPROBE01A_shipping_content.jpg)

### PCB









#### PCB dimensions

![TFPROBE01A PCB dimensions](doc/img/TFPROBE01A_dimensions.png)

##### Optical and magnetic probe positions on PCB

![TFPROBE01A optical probe position](doc/img/TFPROBE01_sensors_positon.png)

### Electronic schema

Full schema is available in [PDF](/doc/gen/TFPROBE01A-schematic.pdf)

[![schema](/doc/gen/TFPROBE01A-schematic.svg)](/doc/gen/TFPROBE01A-schematic.pdf)